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Fenthion is used for field and post-harvest treatment of various fruits, vegetables, and ornamentals[including sugar cane, rice, field corn, beets, pome and stone fruits, citrus fruits, pistachio, cotton, olives, coffee, cocoa and vines], for mosquito control in water and septic tanks, for pest control in commercial and domestic areas and as an ectoparasiticide in cattle.
Fenthion is also used for quarantine control of Queensland fruit fly and other fruit flies through post-harvest treatments[dipping, flood sprays and non-recirculating low volume sprays].
Fenthion is highly effective in the treatment of various pests including fruit flies, leafhoppers, cereal bugs, stem borers, mosquitoes, animal parasites, mites, aphids, codling moths, and weaverbirds.
CAS Number: 55-38-9
Molecular Formula: C10H15O3PS2
Molecular Weight: 278.33
EINECS Number: 200-231-9
Synonyms: fenthion, 55-38-9, Lebaycid, Spotton, Baytex, Queletox, Baycid, Tiguvon, Entex, Fenthione, Phenthion, Figuron, Talodex, Sulfidophos, Fenthion-methyl, Bayer 29493, Pro-Spot, Fenthion 4E, MPP (pesticide), Bay-Bassa, Bayer 9007, Bayer S-1752, OMS 2, 4-Methylmercapto-3-methylphenyl dimethyl thiophosphate, DTXSID8020620, NCI-C08651, BAY 29493, ENT 25,540, BL0L45OVKT, O,O-Dimethyl-O-4-(methylmercapto)-3-methylphenyl thiophosphate, O,O-Dimethyl O-4-(methylmercapto)-3-methylphenyl phosphorothioate, O,O-Dimethyl O-4-methylthio-m-tolyl phosphorothioate, S 1752, NSC-755881, B 29493, Phosphorothioic acid, O,O-dimethyl O-(3-methyl-4-(methylthio)phenyl) ester, O,O-Dimethyl O-(4-(methylthio)-m-tolyl) phosphorothioate, O,O-Dimethyl O-(4-methylthio-3-methylphenyl) thiophosphate, O,O-Dimethyl O-(4-methylthio-3-methylphenyl) phosphorothioate, O,O-Dimethyl O-(3-methyl-4-methylmercaptophenyl)phosphorothioate, m-Cresol, 4-(methylthio)-, O-ester with O,O-dimethyl phosphorothioate, DTXCID00620, O,O-Dimetil-O-(3-metil-4-metiltio-fenil)-monotiofosfato, O,O-Dimethyl O-3-methyl-4-methylthiophenyl phosphorothioate, CHEBI:34761, O,O-Dimethyl-O-(3-methyl-4-methylthio-fenyl)-monothiofosfaat, o,o-dimethyl o-(3-methyl-4-(methylthio)phenyl) phosphorothioate, O,O-Dimethyl-O-(3-methyl-4-methylmercaptophenyl)phosphorothioate, O,O-Dimethyl-O-4-(methylmercapto)-3-methylphenyl phosphorothioate, Thiophosphate de O,O-dimethyle et de O-(3-methyl-4-methylthiophenyle), O,O-Dimethyl O-(3-methyl-4-methylthio-fenyl)-monothiofosfaat, O,O-Dimethyl-O-(3-methyl-4-methylthio-phenyl)-thionophosphat, O,O-Dimethyl-O-(3-methyl-4-methylthiophenyl)-monothiophosphat, Phosphorothioic acid, O,O-dimethyl O-(4-(methylthio)-m-tolyl) ester, Phosphorothioic acid, O,O-dimethyl O-[3-methyl-4-(methylthio)phenyl] ester, o,o-Dimethyl o-[3-methyl-4-(methylsulfanyl)phenyl] thiophosphate, Phosphorothioic acid, O,O-dimethyl O-[4-(methylthio)-m-tolyl] ester, methyl 3-methyl-4-(methylsulfanyl)phenyl methoxy(sulfanylidene)phosphonite, O,O-dimethyl O-(3-methyl-4-(methylsulfanyl)phenyl) thiophosphate, Pro-Spot Solution, RefChem:55184, O,O-dimethyl O-(3-methyl-4-methylthiophenyl) thiophosphate, Tiguvon Pour-On Cattle Insecticide, O,O-DIMETHYL O-3-METHYL-4-(METHYLSULFANYL)PHENYL PHOSPHOROTHIOATE, Spotton 20% Ready-to-Use Cattle Insecticide, 200-231-9, Mercaptophos, Fenthion solution, ENT 25540, NCGC00091635-01, O,O-Dimethyl O-(3-methyl-4-(methylthio)phenyl)phosphorothioate, Caswell No. 456F, Lebayeid, C10H15O3PS2, O,O-dimethyl O-[3-methyl-4-(methylsulfanyl)phenyl] phosphorothioate, Phosphorothioic acid, O,O-dimethyl O-[3-methyl-4-(methylthio)phenyl]ester, CAS-55-38-9, Mosquitocide 700, CCRIS 310, HSDB 1403, Fenthion [BSI:ISO], Fenthion [INN:BAN], EINECS 200-231-9, UNII-BL0L45OVKT, EPA Pesticide Chemical Code 053301, BRN 1974129, o,o-Dimethyl o-[3-methyl-4-(methylthio)phenyl]phosphorothioate, AI3-25540, Fenthion (BAN), Fenthion (MPP), MPP (Pestiide), Tiguvon (TN), Dimethyl methylthiotolyl phosphorothioate, Spectrum_001919, FENTHION [HSDB], SpecPlus_000550, FENTHION [ISO], FENTHION [MI], O,O-Dimethyl O-(4-methylmercapto-3-methylphenyl) thionophosphate, O,O-Dimetil-O-(3-metil-4-metiltio-fenil)-monotiofosfato [Italian], Spectrum2_001231, Spectrum3_000855, Spectrum4_000695, Spectrum5_002028, FENTHION [MART.], O,O-Dimethyl O-(3-methyl-4-methylthio-fenyl)-monothiofosfaat [Dutch], O,O-Dimethyl-O-(3-methyl-4-methylthio-fenyl)-monothiofosfaat [Dutch], O,O-Dimethyl-O-(3-methyl-4-methylthio-phenyl)-thionophosphat [German], O,O-Dimethyl-O-(3-methyl-4-methylthiophenyl)-monothiophosphat [German], Thiophosphate de O,O-dimethyle et de O-(3-methyl-4-methylthiophenyle) [French], SCHEMBL26907, BSPBio_002469, KBioGR_001189, KBioSS_002461, SPECTRUM330064, MLS002695988, BIDD:ER0528, DivK1c_006646, FENTHION [GREEN BOOK], SPBio_001102, Dimethyl O-(4-(methylthio)-m-tolyl) phosphorothioate, CHEMBL1604375, SCHEMBL29441335, KBio1_001590, KBio2_002454, KBio2_005022, KBio2_007590, KBio3_001969, PNVJTZOFSHSLTO-UHFFFAOYSA-, Dimethyl (3-methyl-4-(methylthio)phenyl) phosphorothionate, Dimethyl O-(3-methyl-4-(methylthio)phenyl) thiophosphate, O,O-dimethyl-O-[4-(methylthio)-m-tolyl] phosphorothioate, HMS3091A22, HMS3264I08, O,O-dimethyl O-[3-methyl-4-(methylthio)phenyl] thiophosphate, Pharmakon1600-00330064, MSK20065, Tox21_111157, Tox21_201595, Tox21_300658, CCG-39101, MFCD00055449, NSC755881, Fenthion 10 microg/mL in Cyclohexane, Fenthion 1000 microg/mL in Acetone, Fenthion 1000 microg/mL in Toluene, AKOS015889922, Tox21_111157_1, DB11412, NSC 755881, NCGC00091635-02, NCGC00091635-03, NCGC00091635-04, NCGC00091635-05, NCGC00091635-06, NCGC00091635-07, NCGC00091635-08, NCGC00091635-09, NCGC00254566-01, NCGC00259144-01, AC-16722, O,O inverted exclamation marka-Dimethyl O inverted exclamation marka-[3-methyl-4-(methylthio)phenyl] thiophosphate, SMR000777965, SBI-0052549.P002, F1310, Fenthion, PESTANAL(R), analytical standard, NS00000066, C14420, D07950, E85601, AB00053057_04, Q418354, SR-01000872733, SR-01000872733-1, BRD-K67217586-001-02-3, BRD-K67217586-001-04-9, BRD-K67217586-001-08-0, O,O-dimethyl O-[3-methyl-4-(methylthio)phenyl]thiophosphate, O,O-Dimethyl-O-(3-methyl-4-methylthio-phenyl)-thionophosphate, O,O-Dimethyl-O-(3-methyl-4-methylthiophenyl)-monothiophosphate, dimethoxy-(3-methyl-4-methylsulfanylphenoxy)-sulfanylidenephosphorane, O,O-Dimethyl O-[3-methyl-4-(methylsulfanyl)phenyl] thiophosphate #, dimethoxy-(3-methyl-4-methylsulfanylphenoxy)-sulfanylidene-lambda5-phosphane, O,O-Dimethyl O-[(3-methyl-4-methylthio)phenyl] phosphorothioate, 9CI, dimethoxy-(3-methyl-4-methylsulfanyl-phenoxy)-sulfanylidene-lambda5-phosphane, InChI=1/C10H15O3PS2/c1-8-7-9(5-6-10(8)16-4)13-14(15,11-2)12-3/h5-7H,1-4H3, LEBAYCID;LEBAYCID(R);FENCHEM;FENTHION;FASTER;ENTEX(R);ENT 25540;BEILIULIN
Fenthion is effective as an insecticide, it is also moderately toxic to mammals, and highly toxic to birds.
Based on its high toxicity to birds, fenthion is used in various parts of the world for weaverbird control.
Pest control operators have used it to control pigeons around public buildings, as well.
Once contacting bird, fenthion can subject to rapid absorption through the skin and killing birds. Acute symptoms of fenthion poisoning in birds include tearing of the eyes, foamy salivation, lack of movement, tremors, congestion of the windpipe, lack of coordination in walking, and an abnormally rapid rate of breathing or difficult breathing.
Fenthion is usually applied as a paste to roosting areas when utilized for such purposes.
Fenthion has also been tested in dogs and cows for possible control of parasites.
Fenthion is a synthetic organophosphorus compound that has been used mainly as an insecticide and acaricide.
Fenthion belongs to the organophosphate family and was developed for controlling a range of agricultural and veterinary pests.
Fenthion is also known by names such as O,O-Dimethyl O-[3-methyl-4-(methylthio)phenyl] phosphorothioate and Baytex.
Fenthion has the molecular formula C10H15O3PS2 and a molecular weight of approximately 278.33 g/mol.
Fenthions CAS Registry Number is 55-38-9, which is commonly used to identify the substance in chemical databases, regulatory documents, and supplier catalogs.
It has also been listed under various trade and product names during its commercial use.
Chemically, fenthion is an organophosphorothioate insecticide.
Fenthions structure contains a phosphorus atom bonded to sulfur and oxygen-containing groups, together with a substituted aromatic ring.
The methylthio group on the aromatic ring is an important structural feature of the molecule.
Fenthion is generally encountered as a colorless to yellowish liquid or oily material in its technical form.
Fenthion has low water solubility compared with many more polar pesticides.
Its physical properties make it more compatible with organic solvents and oil-based formulations than with water.
Fenthion has historically been used as a broad-spectrum insecticide.
Fenthion can act against insects from several different groups, making it useful in agricultural pest-control programs.
Its activity has also resulted in applications outside conventional field-crop protection.
Fenthion works primarily by interfering with the cholinergic nervous system of insects.
Like other organophosphate insecticides, it inhibits acetylcholinesterase, an enzyme responsible for breaking down the neurotransmitter acetylcholine.
When this enzyme is inhibited, acetylcholine accumulates and disrupts normal nerve signaling.
The accumulation of acetylcholine causes continuous stimulation of nerve and muscle cells.
Affected insects can develop uncontrolled movement, paralysis, and eventually death.
This mechanism is responsible for the insecticidal activity of fenthion.
Fenthion has been used against a variety of sucking, chewing, and other insect pests.
Its historical agricultural applications have included pest control in fruit crops and other cultivated plants.
The exact permitted uses have differed between countries and have changed over time because of regulatory decisions.
Fenthion has been used particularly in the protection of fruit crops.
Fenthion has historically been applied against pests affecting citrus, olives, cherries, peaches, apples, and other crops in some regions.
Its use depended on the crop, pest species, formulation, application rate, and local pesticide regulations.
Fenthion has also been used against fruit flies.
Fenthion has been particularly associated with control programs targeting economically important fruit-fly species.
This application made it relevant to both commercial agriculture and pest-management programs.
Fenthion has been used in some livestock and veterinary pest-control applications.
Organophosphorus insecticides such as fenthion have historically been used against external parasites affecting animals.
However, the permitted veterinary uses vary considerably between jurisdictions.
Fenthion has also been used in public-health and pest-control research.
Fenthions insecticidal activity has made it relevant to studies involving insect vectors and other pest species.
Because of its toxicity, however, such applications require strict control and appropriate risk assessment.
Fenthion has been investigated for its effectiveness against mosquitoes and other insects.
Fenthions ability to inhibit acetylcholinesterase makes it toxic to many insect species.
Research has examined its potential role in controlling disease-vector populations.
Fenthion has also been used in bird pest control, particularly in historical applications involving nuisance or pest birds.
Treated materials or bait systems were developed in some locations to control bird populations.
These uses generated environmental concerns because fenthion can also be toxic to non-target organisms.
One important characteristic of fenthion is that it can be highly toxic to birds.
This toxicity has been an important factor in regulatory decisions and restrictions involving the compound.
Bird exposure can occur through direct contact, ingestion of treated material, or consumption of contaminated food.
Fenthion is also toxic to aquatic organisms.
Runoff from treated agricultural areas can potentially transport pesticide residues into surface water.
This environmental behavior is one reason why application and disposal controls are important.
Fenthion has a strong biological effect even at relatively low concentrations.
Fenthions ability to interfere with acetylcholinesterase is not limited to insects and can affect other organisms.
This contributes to its occupational and environmental hazard profile.
Fenthion can enter the environment through agricultural application, accidental spills, improper disposal, and contaminated runoff.
Once released, it can interact with soil, water, plants, and wildlife.
Its environmental persistence depends on factors such as temperature, sunlight, microbial activity, and soil characteristics.
Fenthion can undergo degradation in the environment.
Hydrolysis, photolysis, and microbial transformation can contribute to the breakdown of fenthion.
The rate of degradation varies significantly depending on environmental conditions.
Fenthion is relatively lipophilic, which means it has an affinity for organic materials and lipids.
This property influences its distribution in environmental systems and biological tissues.
Fenthion can also affect how pesticide residues behave on plant surfaces and in organisms.
Fenthion has been studied extensively in pesticide residue analysis.
Analytical laboratories can determine fenthion residues in food, environmental samples, and biological materials using chromatographic methods.
Gas chromatography and mass spectrometry have been particularly useful for this purpose.
Fenthion can be detected using gas chromatography coupled with mass spectrometry (GC-MS).
This technique provides both separation and structural information and is useful for measuring low concentrations.
Other chromatographic techniques can also be used depending on the sample matrix and analytical requirements.
Fenthion has also been studied using liquid chromatography-based methods.
Modern analytical laboratories may use liquid chromatography with mass spectrometric detection for pesticide residue analysis.
These methods can provide high sensitivity and selectivity.
Fenthion has historically been formulated as emulsifiable concentrates, solutions, and other pesticide formulations.
Formulation technology is used to make the active ingredient easier to apply to crops or other target areas.
The formulation can significantly affect handling properties and exposure risks.
Fenthion can be absorbed through skin, inhalation, or ingestion.
Occupational exposure is particularly relevant during pesticide mixing, loading, spraying, and equipment cleaning.
Appropriate protective measures are therefore essential when handling products containing fenthion.
Fenthion's toxicological effects are primarily associated with acetylcholinesterase inhibition.
Excessive exposure can produce symptoms associated with cholinergic overstimulation.
These effects can include sweating, salivation, nausea, vomiting, abdominal discomfort, muscle weakness, breathing difficulties, and neurological symptoms.
Because fenthion affects the nervous system, exposure can become medically serious at sufficiently high doses.
Severe organophosphate poisoning can interfere with breathing and normal neuromuscular function.
Suspected significant exposure requires urgent medical evaluation.
Fenthion is therefore not a chemical that should be handled casually.
Laboratory and industrial workers should follow the manufacturer's Safety Data Sheet and applicable pesticide regulations.
Respiratory protection, gloves, protective clothing, and eye protection may be required depending on the formulation and operation.
Fenthion has historically been used in commercial agriculture, but regulatory status differs substantially between countries.
Some jurisdictions have restricted or withdrawn certain uses because of risks to human health and wildlife.
Therefore, a historical description of fenthion's applications should not be interpreted as evidence that the same uses are currently legal.
Fenthion has been particularly affected by concerns regarding avian toxicity.
Fenthions toxicity to birds has resulted in restrictions and the discontinuation of some uses in certain countries.
Environmental risk assessments have therefore played an important role in determining where and how it can be used.
Fenthion is also important in pesticide toxicology research.
Researchers study its effects on acetylcholinesterase, nervous-system function, metabolism, and environmental organisms.
Such research helps evaluate the risks associated with organophosphorus pesticides.
Fenthion has been used as a reference compound in organophosphate research.
Fenthion well-established mechanism provides a useful comparison when studying other acetylcholinesterase-inhibiting pesticides.
Researchers can compare toxicity, degradation, metabolism, and biological activity between related compounds.
The metabolism of fenthion has also been investigated.
In biological systems, it can undergo oxidative and hydrolytic transformations that produce metabolites with different chemical and toxicological properties.
Understanding these transformations is important for assessing exposure and environmental fate.
One important aspect of organophosphate toxicology is that some compounds can be metabolically activated.
Oxidative transformation of the parent pesticide can produce metabolites with stronger acetylcholinesterase-inhibiting activity.
This mechanism has been investigated in relation to the toxicity of fenthion and related compounds.
Fenthion is also relevant to food-safety monitoring.
Where its use has been permitted, regulatory laboratories can monitor residues on agricultural products.
Maximum residue limits and withdrawal periods are established by relevant authorities where applicable.
Fenthion has been used in studies involving pesticide degradation on fruits and vegetables.
Researchers can measure how quickly residues decrease after application.
Factors such as sunlight, rainfall, temperature, washing, and microbial activity can influence residue levels.
Fenthion has also been investigated in soil chemistry and environmental fate studies.
Researchers examine adsorption to soil particles, movement through soil, degradation, and potential transport to water.
These properties are important when evaluating environmental exposure.
Fenthion can interact with soil organic matter because of its relatively hydrophobic character.
This can influence how strongly it is retained in certain soils.
Soil composition and environmental conditions can therefore affect its mobility and persistence.
Fenthion has been studied in relation to pesticide resistance.
Repeated exposure to organophosphate insecticides can select insect populations with mechanisms that reduce susceptibility.
Researchers have investigated enzymatic detoxification, target-site changes, and other resistance mechanisms.
Fenthion is also relevant to integrated pest management research.
Modern pest-control strategies often combine chemical, biological, cultural, and mechanical methods.
Where fenthion is legally permitted, its use would need to be considered alongside resistance management and environmental protection measures.
From an industrial perspective, fenthion belongs to the specialty agrochemical sector rather than the commodity chemical sector.
Fenthions production involves controlled synthesis of an organophosphorus active ingredient followed by formulation into pesticide products.
Manufacturing requires strict controls because of the toxicological properties of the active substance.
Fenthion is a historical organophosphate insecticide and acaricide with a strong acetylcholinesterase-inhibiting mechanism.
It has been used in agriculture, fruit-fly control, veterinary pest management, and certain pest-control programs, but concerns about human toxicity and especially effects on birds and aquatic organisms have resulted in significant restrictions in various places.
Fenthions importance is found not only in pesticide applications where legally permitted but also in pesticide toxicology, residue analysis, environmental monitoring, and research into organophosphate insecticides.
Melting point: 7.5°C
Boiling point: 87°C (0.01 mmHg)
Density: 1.25
vapor pressure: 7.4 x 10-4 Pa (20 °C)
refractive index: nD20 1.5698
Flash point: >100 °C
storage temp.: 2-8°C
solubility: Chloroform (Sparingly), DMSO (Sparingly)
form: liquid
Water Solubility: 0.0055 g/100 mL
Merck: 13,4030
BRN: 1974129
Henry's Law Constant: 6.8×100 mol/(m3Pa) at 25℃, HSDB (2015)
Exposure limits PC-TWA:0.2 mg/m3; PC-STEL:0.3 mg/m3
Stability: Stable. Incompatible with strong oxidizing agents.
Major Application: agriculture
cleaning products
cosmetics
environmental
food and beverages
personal: care
InChI: 1S/C10H15O3PS2/c1-8-7-9(5-6-10(8)16-4)13-14(15,11-2)12-3/h5-7H,1-4H3
InChIKey: PNVJTZOFSHSLTO-UHFFFAOYSA-N
SMILES: COP(=S)(OC)Oc1ccc(SC)c(C)c1
Fenthion is an organothiophosphate insecticide, avicide, and acaricide. Like most other organophosphates, it acts as a cholinesterase inhibitor.
It has relatively low toxicity towards humans and mammals and is listed as moderately toxic compound in U.S.
Environmental Protection Agency and World Health Organization toxicity class. However, it is highly toxic to birds.
Fenthion can be used in agriculture and against mosquito larvae in tropical fresh waters.
Fenthion is a contact and stomach insecticide, which can be used for the treatment of many sucking, biting pests, especially mosquitoes, fruit flies, stem borers, and Eurygaster cereal bugs.
Specially, it is toxic to both the adult and immature forms of the mosquitoes.
Due to that it has been used extensively in the U.S. for controlling intestinal worms, fenthion no longer has FDA approval due to an excess number of poisoning deaths.
Fenthion is available in dust, emulsifiable concentrate, granular, liquid concentrate, spray concentrate, ULV and wettable powder formulations.
Fenthion belongs to one of a class of insecticides referred to as organophosphates.
These chemicals act by interfering with the activities of cholinesterase, an esterase that lyses choline-based esters, several of which serve as neurotransmitters.
Thus, Fenthion is either of two enzymes that catalyze the hydrolysis of these cholinergic neurotransmitters, such as breaking acetylcholine into choline and acetic acid.
These reactions are necessary to allow a cholinergic neuron to return to its resting state after activation.
Therefore, it is essential for the proper working of the nervous systems of both humans and insects.
Fenthion is an organophosphorus pesticide that was developed for controlling insects and mites on agricultural crops.
Fenthion became commercially important because it could control several different pest species and could be used on a variety of crops.
Although many of its historical applications are well documented, its regulatory status has changed considerably in different countries.
Fenthion is also classified as an organophosphorothioate, meaning that its phosphorus center is associated with sulfur-containing functionality.
This structural feature is common among several important organophosphate insecticides.
The chemical structure contributes to its biological activity and also influences its environmental behavior.
The molecule contains a phosphorothioate group attached to a substituted aromatic ring.
Fenthion also contains methoxy groups and a methylthio substituent on the aromatic portion of the molecule.
These structural features give fenthion its characteristic combination of hydrophobicity and biological activity.
Fenthion has relatively low solubility in water compared with many polar organic compounds.
Fenthion is more soluble in several organic solvents and can therefore be incorporated into solvent-based pesticide formulations.
Its limited water solubility also affects how it behaves after reaching soil and water.
Fenthion is relatively lipophilic, which means that it has a tendency to associate with organic matter and lipid-containing phases.
This property can influence its movement through environmental systems and its interaction with biological organisms.
Fenthion is also one reason why pesticide residue behavior needs to be evaluated carefully.
Fenthion's insecticidal activity depends on its interaction with the acetylcholinesterase enzyme system.
Acetylcholinesterase normally breaks down acetylcholine after nerve signals have been transmitted.
When this enzyme is inhibited, acetylcholine accumulates and normal nerve signaling becomes disrupted.
The resulting overstimulation affects muscles, nerves, and other cholinergic systems.
In insects, this can lead to tremors, loss of coordination, paralysis, and eventually death.
The same fundamental mechanism is responsible for the toxic effects of organophosphate exposure in mammals.
Fenthion is therefore considered a cholinesterase-inhibiting pesticide.
This classification is important when assessing both occupational exposure and environmental toxicity.
Fenthion also explains why symptoms of poisoning can involve several different parts of the nervous system.
Fenthion does not simply remain unchanged after entering an organism.
Fenthion can undergo metabolic transformation, including oxidative reactions and hydrolysis.
Some metabolites may have biological activity that differs from that of the original compound.
The oxidative metabolism of organophosphorothioates can be particularly important because it can produce oxon metabolites.
These metabolites can interact more strongly with acetylcholinesterase than the parent phosphorothioate in some cases.
This metabolic activation is an important concept in understanding organophosphate toxicity.
Fenthion has been investigated in insect toxicology studies because different insect species can respond differently to the compound.
Differences in metabolism, detoxification enzymes, and acetylcholinesterase sensitivity can affect susceptibility.
This helps explain why a pesticide can be highly effective against one pest but less effective against another.
Fenthion has also been studied in relation to insecticide resistance.
Repeated pesticide exposure can select pest populations that are better able to survive treatment.
Resistance mechanisms can involve increased detoxification, changes in the target enzyme, or reduced penetration of the pesticide.
Enzymes such as esterases, glutathione-S-transferases, and cytochrome P450 monooxygenases can contribute to pesticide detoxification in insects.
Changes in the activity of these enzyme systems can influence sensitivity to organophosphate insecticides.
Research into these mechanisms helps explain declining pesticide effectiveness in resistant populations.
Fenthion has historically been particularly important in fruit-fly management.
Fruit flies can cause substantial economic losses because larvae develop inside fruits and reduce their commercial quality.
Fenthion was used in some regions as part of chemical control programs against these pests.
Fenthion has also been applied historically against scale insects, aphids, thrips, and other agricultural pests.
The actual spectrum of control depended on the crop, formulation, application method, and target pest.
These uses are now subject to much greater regulatory scrutiny than in earlier decades.
Fenthion has been associated with citrus pest management.
Citrus-producing regions historically used organophosphate insecticides to control several insect species that damage leaves, fruit, or plant tissues.
Fenthion was one of the compounds used for this purpose in certain agricultural systems.
Fenthion has also been used historically in olive production.
Olive pests can significantly affect fruit quality and yield, and fenthion was used in some regions to control specific insect pests.
Regulations concerning these applications differ between countries.
Fenthion has also been associated with stone-fruit and other fruit-crop protection.
Its broad insecticidal activity made it attractive for pest management where permitted.
However, concerns about residues and non-target toxicity have limited or eliminated some of these uses.
Fenthion has also been investigated for controlling pests affecting stored agricultural products.
Organophosphate pesticides have historically been used in different stages of agricultural production, including protection of harvested commodities.
The suitability of fenthion for a particular stored-product application depends on local regulations and residue requirements.
Fenthion has been used in some veterinary ectoparasite-control applications.
Ectoparasites such as flies and other insects can affect livestock and domestic animals.
Organophosphate compounds were historically used for this purpose because of their strong insecticidal activity.
Fenthion has also been studied in animal ectoparasite research.
Researchers have examined its effectiveness against external parasites and the factors affecting its toxicity.
Because animals can also be exposed to organophosphate pesticides, veterinary applications require careful dosing and handling.
Another area of historical use is bird population control.
Fenthion was used in some locations for managing pest or nuisance bird populations.
This application became controversial because the compound is highly toxic to birds.
The avian toxicity of fenthion is particularly important from an environmental perspective.
Birds can be exposed by consuming treated material or contaminated food and through direct contact with pesticide residues.
This risk contributed to restrictions on certain uses.
Fenthion can also be toxic to fish and aquatic invertebrates.
If pesticide residues enter surface water, aquatic organisms may be exposed to concentrations that can cause adverse effects.
Preventing runoff and improper disposal is therefore important when the compound is used.
Fenthion's environmental behavior depends strongly on soil and climate conditions.
Temperature, sunlight, moisture, pH, microbial activity, and soil composition can all influence degradation.
As a result, persistence can vary considerably from one environment to another.
Fenthion can be affected by photodegradation when exposed to sunlight.
Ultraviolet radiation can contribute to chemical transformation on exposed surfaces.
This process can reduce the amount of parent compound over time, although degradation products also need to be considered.
Fenthion can also undergo microbial degradation in soil.
Soil microorganisms can transform pesticide molecules through different biochemical pathways.
The rate of microbial degradation depends on the microbial community and environmental conditions.
Hydrolysis can contribute to the breakdown of fenthion under suitable conditions.
The rate of hydrolysis can depend on pH and temperature.
This means that the chemical may behave differently in acidic, neutral, or alkaline environments.
Fenthion can interact with soil organic matter because of its hydrophobic character.
Adsorption to soil particles can reduce its mobility through some soils.
However, the extent of adsorption depends on soil composition and other environmental factors.
Fenthion can therefore be investigated in environmental fate studies.
Researchers measure its concentration in soil, water, sediment, plants, and biological samples over time.
These studies help determine where the pesticide goes after application.
Fenthion residues can be monitored in food products using sensitive analytical methods.
This is particularly important for crops where the pesticide was historically used.
Residue testing can determine whether concentrations remain below applicable regulatory limits.
Gas chromatography has traditionally been important for fenthion residue analysis.
The compound can be separated chromatographically and detected using suitable detectors.
Modern laboratories may also use mass spectrometric detection for greater selectivity.
GC-MS and LC-MS/MS can be used for trace-level pesticide analysis.
These techniques allow laboratories to distinguish fenthion from other compounds in complex samples.
They are useful in food-safety testing, environmental monitoring, and toxicological studies.
Fenthion can also be analyzed in biological samples.
Blood, urine, tissue, or other matrices may be examined in toxicology research depending on the study design.
Analytical methods can measure the parent compound and, in some cases, relevant metabolites.
Environmental laboratories can investigate fenthion in surface water and sediment.
These measurements help determine whether agricultural use has resulted in contamination of nearby ecosystems.
Monitoring is especially important near areas where pesticide applications have historically occurred.
Fenthion has been used as a reference pesticide in toxicological studies.
Researchers can compare its effects with other acetylcholinesterase inhibitors.
This helps scientists understand how differences in molecular structure influence toxicity and environmental behavior.
Fenthion is also relevant to research into organophosphate poisoning.
Animal and laboratory studies can be used to investigate cholinesterase inhibition and recovery after exposure.
These studies have contributed to the broader understanding of organophosphate toxicology.
Cholinesterase activity can be measured as a biomarker of organophosphate exposure.
A decrease in acetylcholinesterase or related cholinesterase activity can indicate significant exposure in appropriate biological contexts.
This approach is used in toxicological and occupational-health research.
Fenthion has also been examined in ecotoxicology studies.
Researchers investigate its effects on insects, fish, birds, aquatic invertebrates, and other organisms.
Such work is important because pesticides are designed to affect biological systems but may also affect non-target species.
Fenthion has particular significance for non-target insect studies.
Beneficial insects such as pollinators and natural enemies of agricultural pests can potentially be exposed to insecticides.
Modern pesticide assessment therefore considers effects beyond the intended pest species.
Fenthion has been investigated in relation to integrated pest management (IPM).
IPM aims to reduce unnecessary pesticide use by combining monitoring, biological control, crop management, and selective chemical treatments.
Where fenthion is legally permitted, its use would need to be evaluated against these broader pest-management principles.
Another important area is pesticide resistance management.
Using the same mode of action repeatedly can increase selection pressure for resistant pest populations.
Alternating or combining appropriate control strategies can help reduce this problem.
Fenthion has also been studied in formulation science.
Different formulations can change how the active ingredient is dispersed, applied, and absorbed by target organisms.
Formulation research can therefore affect both efficacy and exposure.
Historically, formulations of fenthion have included emulsifiable concentrates and other liquid pesticide products.
These formulations allow the active ingredient to be mixed with appropriate carriers and applied to crops.
The safety characteristics of the formulated product can differ from those of the pure active ingredient.
Fenthion is also relevant to pesticide manufacturing research.
Production requires control of chemical purity, unwanted by-products, residual solvents, and formulation characteristics.
Because fenthion is toxic, manufacturing operations require appropriate engineering and occupational controls.
Fenthion is not normally considered a general-purpose industrial chemical.
Fenthions importance is primarily connected with agriculture, pest management, pesticide research, and analytical testing.
The majority of its chemical significance comes from its biological activity rather than from applications as a solvent or manufacturing additive.
Fenthions commercial importance has decreased in some regions because of environmental and toxicological concerns.
Regulatory agencies have evaluated risks to workers, consumers, wildlife, and aquatic ecosystems.
As a result, products and uses that were historically available may no longer be permitted.
The regulatory situation should always be checked country by country.
A pesticide can be approved for a particular crop in one jurisdiction while being prohibited or heavily restricted elsewhere.
Historical references to fenthion use therefore do not necessarily describe its current legal status.
Fenthion remains relevant to chemical databases, analytical laboratories, pesticide residue research, and environmental toxicology.
Researchers may encounter it when studying historical pesticide contamination or comparing organophosphate compounds.
Its established mechanism and well-documented environmental effects make it an important reference compound.
Fenthion is much more than simply an old agricultural pesticide.
Its chemistry connects organophosphorus synthesis, acetylcholinesterase inhibition, pesticide metabolism, environmental degradation, residue analysis, and ecotoxicology.
Fenthions historical effectiveness against agricultural pests explains why it was widely used, while its toxicity to humans and especially non-target organisms explains why its use has become much more restricted in many parts of the world.
Uses:
Fenthion is an organothiophosphate used as an insecticide. Fenthion is also a potent acaricide.
Fenthion has primarily been used as an organophosphate insecticide for controlling agricultural pests.
Fenthion has been applied to crops where insects damage leaves, fruits, stems, or developing plant material.
Its broad insecticidal activity made it useful in several different pest-management programs.
One of the best-known historical uses of fenthion is fruit-fly control.
Fenthion has been used against fruit flies that lay eggs in commercially important fruits, where the developing larvae can cause serious crop losses.
This application has made fenthion particularly relevant to fruit-growing regions.
Fenthion has historically been used in citrus production.
Fenthion was applied against certain insect pests that affect citrus trees and fruit.
Fenthion's activity against several pest groups allowed it to be incorporated into crop-protection programs where permitted.
Fenthion has also been used on stone fruits such as peaches and cherries.
In these crops, insect pests can damage both the developing fruit and the plant itself.
Fenthion was historically used to reduce populations of particular target pests.
Fenthion has been used in olive cultivation in some regions.
Fenthion was particularly associated with control of insect pests that can reduce olive yield and quality.
Its use in olives has nevertheless become subject to increasingly strict residue and environmental regulations.
Another historical application was the control of scale insects.
Scale insects feed on plant tissues and can weaken crops when populations become high.
Fenthion's contact and systemic-related insecticidal activity made it useful against some of these pests.
Fenthion has also been used against aphids and other sap-feeding insects.
These pests can weaken plants by removing plant fluids and may also contribute to the spread of plant diseases.
Organophosphate insecticides such as fenthion were historically used to suppress these populations.
Fenthion has been used against certain thrips and other small insect pests.
Thrips can damage flowers, leaves, and fruits and may be difficult to control because of their small size.
Fenthion was one of the insecticides historically used against susceptible populations.
Fenthion has also been used against various chewing insects.
Fenthions effect on the insect nervous system can provide control of pests that feed directly on plant tissues.
The exact effectiveness depends on the pest species and its susceptibility to the compound.
Fenthion has been used in commercial fruit-crop protection.
Growers historically selected it when several pest species needed to be controlled within the same production system.
Its broad activity was one of the reasons for its adoption in agricultural pest management.
Another use has been pesticide treatment in fruit-fly management programs.
Fenthion could be incorporated into organized pest-control strategies designed to reduce fruit-fly populations before they caused significant economic damage.
Such programs have been used in areas where the compound was legally approved.
Fenthion has also been used in veterinary pest control.
Historically, products containing organophosphate compounds were used to control external parasites affecting livestock and other animals.
The suitability of fenthion for a particular veterinary application depended on local approval and the formulation used.
Fenthion has been used against certain animal ectoparasites.
These include external insect pests that can irritate animals and reduce their health or productivity.
Because of its toxicity, veterinary applications require careful consideration of animal safety and exposure.
Fenthion has also had historical applications in livestock pest management.
External flies and other insects can be a significant problem in agricultural animal production.
Organophosphate pesticides were used in some systems to reduce these pest populations.
Another historical use involved pest-bird control.
Fenthion was used in some locations to control birds considered agricultural pests or nuisances.
This application is particularly significant because fenthion is highly toxic to birds and consequently raised substantial environmental concerns.
Fenthion has been investigated for mosquito control and other insect-vector applications.
Because mosquitoes depend on acetylcholinesterase for normal nervous-system function, organophosphate insecticides can be effective against susceptible mosquito populations.
However, environmental toxicity and resistance concerns have limited the suitability of such compounds.
Fenthion has therefore also appeared in vector-control research.
Researchers have evaluated its activity against mosquito and other insect populations under controlled conditions.
These studies have helped characterize its effectiveness and limitations as an organophosphate insecticide.
Fenthion has been used in pesticide resistance studies.
Scientists investigate how repeated exposure to fenthion affects susceptible and resistant insect populations.
This research helps identify biochemical and genetic mechanisms responsible for reduced pesticide sensitivity.
Fenthion can be used as a reference organophosphate insecticide in laboratory experiments.
Fenthions established acetylcholinesterase-inhibition mechanism provides a useful comparison when researchers evaluate other pesticides.
Researchers can compare toxicity, metabolism, enzyme inhibition, and resistance patterns.
Fenthion is also used in pesticide toxicology research.
Laboratory studies can investigate how fenthion affects nervous-system function and how organisms metabolize the compound.
These experiments contribute to understanding the risks associated with organophosphate exposure.
Fenthion has been used in environmental monitoring studies.
Researchers may analyze soil, sediment, water, plant material, or biological samples for residues.
This is particularly useful in areas where fenthion was historically used in agriculture.
Fenthion is also relevant to food-residue analysis.
Where fenthion use has been permitted, laboratories can test fruits and other agricultural products for pesticide residues.
Such analysis helps determine whether residues comply with applicable regulatory limits.
Fenthion is used as a target compound in pesticide residue testing by GC-MS and LC-MS/MS.
These analytical methods allow laboratories to detect very small quantities of the pesticide in complicated sample matrices.
This makes them useful for food safety, environmental testing, and forensic investigations.
Fenthion has also been used in soil-degradation studies.
Researchers monitor how its concentration changes after application to soil under controlled conditions.
This helps determine the influence of temperature, moisture, microorganisms, and soil composition on degradation.
Fenthion can be used in studies of pesticide photodegradation.
Researchers expose the compound to controlled light conditions and analyze the products formed during degradation.
These experiments help explain how sunlight contributes to pesticide dissipation.
Fenthion is also relevant to aquatic contamination research.
Scientists can investigate how fenthion reaches surface water through agricultural runoff or accidental release.
Measurements in water and sediment help assess potential effects on aquatic organisms.
Fenthion has been used in ecotoxicology experiments involving insects, fish, birds, and aquatic invertebrates.
These studies help determine the effects of pesticide exposure on organisms that are not necessarily the intended agricultural pests.
Such information is important when evaluating environmental risks.
Fenthion is particularly important in research involving avian toxicity.
Because birds can be highly sensitive to fenthion, laboratory and field studies have examined exposure routes and toxic effects.
This research has contributed to restrictions on certain historical uses.
Fenthion has also been investigated in pollinator and beneficial-insect research.
Agricultural insecticides can affect organisms that provide important ecological services.
Studying these effects helps researchers evaluate whether a pesticide can be integrated into pest-management systems without unacceptable ecological impacts.
Fenthion has been used in integrated pest management research as an example of a conventional chemical-control option.
Researchers can compare chemical treatment with biological control, crop sanitation, trapping, and other pest-management methods.
The objective is to determine how pest populations can be controlled while reducing unnecessary pesticide exposure.
Fenthion has also been used in studies of pesticide application technology.
Researchers examine how application method, droplet size, concentration, and environmental conditions influence pest control and off-target exposure.
These studies can help explain why the same active ingredient behaves differently under different application conditions.
Fenthion has been investigated in formulation research.
Fenthion can be incorporated into different formulations designed to improve handling and application characteristics.
The formulation can influence how the active ingredient is dispersed and how exposure occurs.
Fenthion has historically been available in emulsifiable concentrate and other pesticide formulations.
These formulations allow the active ingredient to be mixed with suitable carriers and diluted before agricultural application.
The safety and environmental properties of the final formulation depend on all of its ingredients, not just fenthion.
Another use is in pesticide metabolism studies.
Researchers examine the enzymes responsible for transforming fenthion within insects, mammals, plants, and microorganisms.
Understanding metabolism helps explain differences in toxicity and persistence between species.
Fenthion can be used to investigate acetylcholinesterase inhibition in laboratory models.
Researchers can measure changes in enzyme activity following exposure to controlled concentrations.
This provides information about the relationship between pesticide concentration and biological response.
Fenthion is also used in research on organophosphate poisoning mechanisms.
Fenthion provides an example of a pesticide whose toxicity is strongly associated with cholinesterase inhibition.
Studies can examine symptoms, biochemical changes, metabolism, and recovery following exposure.
Fenthion has been used as a comparative compound in pesticide-development research.
New insecticides can be evaluated against established organophosphates to determine differences in potency, selectivity, persistence, or resistance development.
This type of comparison can help researchers identify alternatives with improved safety profiles.
Fenthion can also be used in analytical chemistry method development.
Laboratories may use known fenthion standards to validate chromatographic procedures for pesticide analysis.
These methods can then be applied to environmental, agricultural, or biological samples.
Fenthion is relevant to forensic environmental investigations.
Residue analysis can help determine whether a site has been contaminated by historical pesticide use or accidental release.
Analytical laboratories can compare detected concentrations with known pesticide-use histories.
Fenthion has also been used in historical pesticide contamination studies.
Because the compound was widely used in some agricultural regions, researchers may encounter residues in older soil or sediment samples.
Such investigations can help reconstruct previous pesticide applications and environmental exposure.
Fenthion has been studied in relation to pesticide transport and runoff.
Researchers examine how rainfall can move pesticide residues from treated fields into drainage systems and surface water.
This information is important for developing measures that reduce contamination of nearby ecosystems.
Another application is agricultural environmental-risk assessment.
Data on toxicity, degradation, residue levels, and exposure are combined to evaluate whether a pesticide use pattern presents unacceptable risks.
Fenthion is a useful example of how agricultural effectiveness must be balanced against environmental hazards.
Fenthion has also been used in pesticide residue reference materials and laboratory standards.
Analytical laboratories require accurately characterized standards when measuring trace levels of pesticides.
Fenthion standards can be used to identify and quantify the compound in complex samples.
Fenthion is sometimes encountered in research concerning historical agricultural practices.
Older scientific literature and environmental surveys may identify it as a pesticide used on fruit and other crops.
Understanding its previous uses is important when interpreting pesticide residues found today.
Fenthions role in agriculture has declined in many regions because of regulatory restrictions and environmental concerns.
Some countries have cancelled registrations or restricted specific applications.
Consequently, its current use should always be checked against the regulations of the country and crop involved.
Fenthion should not therefore be described as a universally approved modern agricultural pesticide.
Many of its commonly documented applications are historical uses, and the legal situation differs considerably between jurisdictions.
This distinction is particularly important when preparing commercial chemical information.
Fenthion has been used mainly for agricultural insect control, fruit-fly management, veterinary ectoparasite control, and certain historical pest-control programs.
It is also widely relevant to pesticide residue analysis, environmental monitoring, toxicology, ecotoxicology, metabolism, resistance research, and analytical method development.
Because of its significant toxicity to humans, birds, and aquatic organisms, its practical applications today are much more restricted than the broad range of uses reported for it historically.
Fenthion has been used in commercial fruit production to protect crops from insect infestations that can reduce marketable yield.
Fenthion was especially useful where growers needed an insecticide capable of affecting more than one pest species.
Its use on fruit crops is now largely a matter of historical or jurisdiction-specific application because of regulatory restrictions.
Fenthion has been used in citrus pest management against insects that attack leaves, branches, and developing fruit.
Citrus pests can cause direct feeding damage and can also reduce fruit quality.
Fenthion was therefore incorporated into some citrus protection programs in the past.
Fenthion has also been used in apple orchards for controlling susceptible insect pests.
Orchard pests can damage both fruit and foliage during different stages of plant development.
The compound was historically selected for its activity against several of these pests.
Fenthion has been used in peach and other stone-fruit orchards.
Insect infestations in stone fruits can result in fruit damage that makes the harvest unsuitable for sale.
Fenthion provided chemical control against certain susceptible insect populations.
Another historical application was in cherry production.
Cherry crops can be affected by fruit flies and other insects that attack the developing fruit.
Fenthion was used in some production systems to reduce these infestations.
Fenthion has also been associated with olive pest control.
Certain insects can damage olives directly or interfere with fruit development.
Where permitted, fenthion was historically used as part of chemical pest-management programs.
It has been used against Mediterranean fruit fly and related fruit-fly species in some agricultural regions.
Fruit flies are particularly difficult pests because their larvae develop inside fruit.
Fenthion was historically valued as a chemical option for reducing fruit-fly populations.
Fenthion has also been used in fruit-fly eradication and suppression programs.
These programs can involve coordinated treatment over large agricultural areas rather than isolated treatment of individual plants.
The objective is to reduce pest populations sufficiently to protect commercial crops.
Another application has involved quarantine pest management.
Countries and agricultural authorities may use pest-control measures to prevent economically important insects from becoming established in new areas.
Historically, fenthion was included in some pest-control strategies of this type.
Fenthion has been used in plant-protection research to compare the effectiveness of different insecticides.
Researchers can expose target pests to controlled concentrations and measure mortality or changes in behavior.
These studies provide information about insecticide potency and susceptibility.
Fenthion has also been used in dose-response experiments.
Different concentrations of fenthion can be tested to determine how pesticide exposure affects insect survival.
Such experiments can produce values such as LC50 or LD50 that are useful for comparing toxicity.
Safety Profile:
Fenthion is a highly toxic organophosphorus pesticide that can cause serious health effects if it is inhaled, swallowed, or absorbed through the skin.
Fenthions principal toxicological effect is associated with inhibition of acetylcholinesterase, an enzyme essential for normal nerve signaling.
Because of its toxicity, fenthion should only be handled under appropriate occupational and laboratory safety procedures.
Fenthion can be harmful or potentially fatal following significant exposure.
The severity of poisoning depends on the concentration, exposure route, duration, and amount absorbed into the body.
Accidental exposure should therefore be treated seriously rather than assuming that a small amount is harmless.
Skin exposure is an important concern because fenthion can be absorbed through the skin.
Contact with contaminated liquid, concentrated formulations, or treated surfaces can contribute to systemic exposure.
Protective gloves and suitable protective clothing are therefore important during handling.
Direct skin contact should be avoided even when there are no immediate visible effects.
Organophosphate pesticides can produce systemic toxicity after absorption without causing severe local skin damage.
Contaminated clothing should be removed and the affected skin washed thoroughly.
Fenthion can cause eye irritation or injury following direct contact.
Splashes may produce redness, watering, burning, and discomfort.
Chemical splash goggles or suitable eye protection should be used when handling the material.
Inhalation of fenthion-containing vapors, aerosols, or spray droplets can result in systemic exposure.
The risk can be particularly important during pesticide spraying, formulation, mixing, or operations that generate airborne droplets.
Adequate ventilation and appropriate respiratory protection are essential where inhalation exposure may occur.
The most characteristic toxic effect of fenthion is cholinesterase inhibition.
When acetylcholinesterase is inhibited, acetylcholine accumulates at nerve junctions.
This causes excessive stimulation of nerves and muscles.
Early symptoms of significant organophosphate exposure may include headache, dizziness, weakness, sweating, salivation, nausea, vomiting, abdominal cramps, and blurred vision.
More serious poisoning can produce muscle twitching, confusion, breathing difficulties, seizures, loss of consciousness, and respiratory failure.
The appearance and severity of symptoms can vary between individuals.
Fenthion can affect the central and peripheral nervous systems.
High exposure can interfere with normal neuromuscular function and coordination.
Severe poisoning can become life-threatening because respiratory muscles may be affected.
