Chemical Identification
Common Name
Cypermethrin
中文通用名
氯氰菊酯
IUPAC
(RS)-a-cyano-3-phenoxybenzyl (1RS,3RS;1RS,3SR)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate : (RS)-a-cyano-3-phenoxybenzyl (1RS)-cis-trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate
CAS
cyano(3-phenoxyphenyl)methyl 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate
CAS No.
52315-07-8
Molecular Formula
C22H19Cl2NO3
Category
Activity

Cypermethrin acts as a stomach and contact insecticide. It has wide uses in cotton, cereals, vegetables and fruit, for food storage, in public health and in animal husbandry. Its structure is based on pyrethrum, a natural insecticide which is contained in chrysanthemum flowers, but it has a higher biological activity and is more stable than its natural model.
Cypermethrin is a synthetic pyrethroid insecticide used to control many pests, including moth pests of cotton, fruit and vegetable crops . It is also used for crack, crevice and spot treatment for control of insect pests in stores, warehouses, industrial buildings, houses, apartment buildings, greenhouses, laboratories and on ships, railcars, buses, trucks and aircraft. It may also be used in non-food areas in schools, nursing homes, hospitals, restaurants, hotels, and in food processing plants and as a barrier treatment insect repellent for horses.
 

CropUse
uses in cotton, cereals, vegetables and fruit, for food storage.
Pest Spectrum
used to control many pests, including moth pests of cotton, fruit and vegetable crops.
Formulation
WP = Wettable powder
Premix
Chlorpyrifos+cypermethrin
Acetamiprid+beta-cypermethrin
Acetamiprid+cypermethrin
Imidacloprid+carbosulfan+zeta-cypermethrin
Imidacloprid+beta-cypermethrin
Imidacloprid+cypermethrin
Endosulfan+cypermethrin
Cypermethrin+diazinon
Cypermethrin+dimethoate
Cypermethrin+ethion
Cypermethrin+fenitrothion
Cypermethrin+phenthoate
Cypermethrin+phoxim
Cypermethrin+Piperonyl butoxide
Cypermethrin+Piperonyl butoxide+tetramethrin
Cypermethrin+profenofos
Cypermethrin+quinalphos
Cypermethrin+tetramethrin
Bioallethrin+zeta-cypermethrin
Alpha-cypermethrin+chlorpyrifos
Hexaflumuron+alpha-cypermethrin
Beta-cypermethrin+abamectin
Beta-cypermethrin+malathion
Beta-cypermethrin+quinalphos
Fenoxycarb+beta-cypermethrin
Profenofos+beta-cypermethrin
Tebufenozide+beta-cypermethrin
Diflubenzuron+beta-cypermethrin
Trichlorfon+beta-cypermethrin
Dichlorvos+beta-cypermethrin
Chlorpyrifos+beta-cypermethrin
Chlorfluazuron+beta-cypermethrin
Hexaflumuron+beta-cypermethrin
Beta-cypermethrin+emamectin benzoate
Beta-cypermethrin+chlorpyrifos-methyl
Beta-cypermethrin+endosulfan
Beta-cypermethrin+malathion+phoxim
Beta-cypermethrin+hanpv
Beta-cypermethrin+methomyl
Beta-cypermethrin+methomyl+phoxim
Beta-cypermethrin+buprofezin
Beta-cypermethrin+triazophos
Beta-cypermethrin+thiosultap-monosodium
Beta-cypermethrin+isocarbophos
Beta-cypermethrin+isocarbophos+phoxim
Beta-cypermethrin+bacillus thuringiensis
Beta-cypermethrin+SlMNPV
Beta-cypermethrin+phoxim
Beta-cypermethrin+phosmet
Beta-cypermethrin+omethoate
Beta-cypermethrin+acephate
Beta-cypermethrin+fenobucarb
Cypermethrin+malathion
acetamiprid+alpha-cypermethrin
bifenthrin+zeta-cypermethrin+imidacloprid
CYPERMETHRIN+FLUTRIAFOL
CYPERMETHRIN+TEBUCONAZOLE
CYPERMETHRIN+TRITICONAZOLE
IMIPROTHRIN+CYPERMETHRIN
CYPERMETHRIN+TRIADIMENOL
Abamectin+Alpha-cypermethrin
Alpha-cypermethrin+Indoxacarb
Physical Properties
Molecular weight:416.3; Physical form:Odourless crystals; ( tech., yellow-brown viscous semi-solid at ambient temperatures). Density:1.24 (20 °C); Composition:Tech. grade is 90% pure. Melting point:61-83 °C, depending on isomer ratio; Flash point:Not auto-flammable; non-explosive; Vapour pressure:2.0×10-4 mPa (20 °C); Henry constant:2.0×10-2 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 6.6; Solubility:In water 0.004 mg/l ( pH 7). In acetone, chloroform, cyclohexanone, xylene >450, ethanol 337, hexane 103 (all in g/l, 20 °C).; Stability:Relatively stable in neutral and weakly acidic media, with optimum stability at pH 4. Hydrolysed in alkaline media; DT50 1.8 d ( pH 9, 25 °C); stable at pH 5 and 7 (20 °C). Soluble in methanol, acetone, xylene, methylene dichloride.
Toxicology
Oral:Acute oral LD50 for male rats 79 mg/kg, female rats 56 mg/kg, mice 20 mg/kg. Percutaneous:Acute percutaneous LD50 for rats 632-696 mg/kg. Mild eye irritant; non-irritant to skin (rabbits). Not a skin sensitiser (guinea pigs). Inhalation: LC50 (4 h) 0.06 mg/l air (total particulate). ADI:( JECFA) 0.002 mg/kg b.w.(temporary) [2000]; ( JMP
Environmental Profile
Ecotoxicology: 
Algae: ErC50 (96 h) for Selenastrum capricornutum >1000 μg/l.Bees: LD50 (oral) 38 ng/bee; (contact) 909 ng/bee.Birds:Acute oral LD50 for mallard ducks >3950 mg/kg. Dietary LC50 for quail >5300 mg/kg. No accumulation of residues in eggs or tissues.Daphnia: EC50 (48 h) 0.36 μg/l.Fish: LC50 (96 h) for bluegill sunfish 0.21 μg/L, rainbow trout 0.36 μg/l.Worms: LC50 for Eisenia foetida >1000 mg/ kg soil.Other aquatic spp.:Intrinsic toxicity to aquatic organisms is greatly reduced by rapid loss from the water by adsorption and degradation.Other beneficial spp.:Toxic to some non-target arthropods. Effects under field conditions reduced, with rapid recovery. 
Environmental fate: 
Animals:In rats, following oral administration, rapidly eliminated in urine and faeces. The ester group is hydrolysed, both moieties forming polar conjugates.Soil:Rapidly degraded in soil; DT50 for microbial degradation 23-82 d, for field soil 6-40 d. Strongly adsorbed to soil and sediment organic matter, Koc 330 000. Negligible potential for leaching of lambdaPlant:For details of metabolism of lambda-cyhalothrin in cotton and soya bean leaves, see D. A. French & J. P. Leahey, Proc. Br. Crop Prot. Conf. - Pests Dis., 1990, 3, 1029-1034.
WATER SOLUBILITY: Insoluble
Transport Information
Signal Word:CAUTION; Hazard Class:II (Moderately hazardous)

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