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Common NameChlorfluazuron
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中文通用名氟啶脲
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IUPAC1-[3,5-dichloro-4-(3-chloro-5-trifluoromethyl-2-pyridyloxy)phenyl]-3-(2,6-difluorobenzoyl)urea
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CASN-[[[3,5-dichloro-4-[[3-chloro-5-(trifluoromethyl)-2-pyridinyl]oxy]phenyl]amino]carbonyl]-2,6-difluorobenzamide
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CAS No.71422-67-8
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Molecular FormulaC20H9Cl3F5N3O3
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Molecular Structure
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Category
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ActivityInsecticide.
Chlorfluazuron is active against juvenile forms of Lepidoptera. It has some ovicidal activity, but this is much less important than the larvicidal activity. The product is primarily active following ingestion, but has some contact activity at higher use rates. Like other IGRs, it is slower to act than neurotoxic insecticides. Chlorfluazuron is non-systemic, it has residual activity lasting up to 14 days and is rainfast.
In field trials some transient phytotoxicity was observed on newly developed leaves. ISK recommends that chlorfluazuron is used in sequence with other insecticides, with no more than two applications per season to avoid the build up of resistance. -
CropUseCrop uses:
soybeans, top fruits, strawberries, tomatoes, vegetables (including potatoes), tea, cotton
25-100 g ai/ha
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PremixFlonicamid+Chlorfluazuron
Chlorfluazuron+beta-cypermethrin
Abamectin+Chlorfluazuron
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Physical PropertiesMolecular weight:540.7; Physical form:White crystals. Density:1.663 (20 °C); Composition:Tech. is 94.0%. Melting point:226.5 °C (decomp.); Flash point:224.0-224.5 °C (OECD 102); Vapour pressure:<1×10-5 mPa (20 °C); Henry constant:<5.41×10-4 Pa m3 mol-1; Partition coefficient(n-octanol and water):logP = 5.8 (unionised); pKa:8.10, v. weak acid; Solubility:In water <0.01 mg/l (20 °C). In hexane <0.01, n-octanol 1, xylene 2.5, methanol 2.5, toluene 6.6, isopropanol 7, dichloromethane 22, acetone 55, cyclohexanone 110 (all in g/l, 20 °C).; Stability:Stable to heat and light, and to hydrolysis.? Solubility: acetone 5.21 g/100 ml; ethanol 0.17 g/100 ml; n-hexane 3.0 ppm; methanol 0.22 g/100 ml; xylene 0.3 g/100 ml.
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ToxicologyOral:Acute oral LD50 for rats >8500, mice 7000 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >1000, rabbits >2000 mg/kg. Non-irritating to skin; mild eye irritant (rabbits). Not a skin sensitiser. Inhalation:LC50 (4 h) for rats >2.4 mg/l. ADI:(JMPR) 0.0005 mg/kg b.w. [1994].?
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Environmental ProfileEcotoxicology: Algae:EC50 (12 d) for green algae >1.8 mg/l.Bees:LD50 (oral) >100
mg/bee.Birds:Acute oral LD50 for quail and mallard ducks >2510 mg/kg. Dietary LC50 (8 d) for quail and mallard ducks >5620 mg/kg diet.Daphnia:LC50(48 h) 0.908 mg/l.Fish: LC50(48 h) for carp >300 mg/l.Worms:LC50 (28 d) for earthworms >1000 mg/kg soil. Environmental fate: Animals:Metabolised in rats by cleavage of the urea bridge.Soil:Half-life in soil varies from c. 6 weeks to a few months. Kd 120-990. Slowly degraded in water, DT50 for aqueous photodegradation 20 h.Plant:Slowly degraded in plants.?WATER SOLUBILITY: 0.016 ppm.
Mallard duck
LD50 >2,510 mg/kg
Bobwhite quail
LD50 >2,510 mg/kg
Rainbow trout
LC50 105 mg/litre
Carp
LC50 >300 mg/litre
Daphnia
LC50 >100 mg/litre
Fate in soil:
The half-life of chlorfluazuron in soil is dependent on soil type.Fate in aquatic systems:
The half-life of chlorfluazuron in aquatic systems is dependent on pH. -
Transport InformationSignal Word:CAUTION; Hazard Class:III(Slightly hazardous)
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