LAMBDA-CYHALOTHRIN

Common name: Lambda-cyhalothrin

Chemical name: [1α( S *),3α( Z )]-cyano(3-phenoxyphenyl)methyl 3-(2-chloro-3,3,3-trifluoro-1-propenyl)-

2,2-dimethylcyclopropanecarboxylate

Structural formula:

Chemical class: Pyrethroid insecticide

CAS No.: 91465-08-6

Properties: Technical product is white powder. M.p. 47.5-48.5 ℃ . V.p. 2 × 10 -4 mPa (20 ℃ ). Soluble in purified water 0.005 (pH 6.5), buffered water 0.004 (pH 5.0) (both in mg/L). In acetone, methanol, toluene, hexane, ethyl acetate, c. 500g/L. Stable to light. Stable on storage for more than 6 months at 15-25 ℃ .

Toxicity: Acute oral LD 50 for male rats 79, female rats 56, male mice 19, female mice 31 mg/kg. Acute percutaneous LD 50 for rats 1293-1507 mg/kg. Mild eye irritant; non-irritant to skin (rabbits). Not a skin sensitiser (guinea pigs). Inhalational, LC 50 (4 h) 0.06 mg/L air (total particulate).

Ecotoxicology: Birds, acute oral LD 50 for mallard ducks ﹥ 3950 mg/kg.. Dietary LC 50 for quail ﹥ 5000 mg/kg. No accumulation of residues in eggs or tissues. Fish, LC 50 for bluegill sunfish 0.21, rainbow trout 0.24 μ g/L. Bees, LD 50 (oral) 38 ng/bee, (contact) 909 ng/bee. Daphania, LC 50 (48 h) 0.36 μ g/L.

Environmental fate: Animals, in rats, following oral administration, rapidly eliminated in urine and faeces. The ester group is hydrolysed, both moieties forming polar conjugates. Plants, for details of metabolism of lambda-cyhalothrin in cotton and soya leaves. Soil/Environment, in water-sediment mixtures in sunlight DT 50 c. 20 d. In soil, DT 50 c. 4-12 w. Leaching of lambda-cyhalothrin and its degradation products through a range of soil types is negligible.

Treatment: Get medical aid. Eyes, flush with plenty of water. Skin, wash with soap and water. If allowed to penetrate skin, apply fat based oil or cream. Water is highly polar and after a prolonged period of time will not decrease but may prolong the irritation. Remove contaminated clothing and shoes. Inhalation, remove to fresh air. Ingestion, drink 1-2 glasses of water.

Mode of action: Non-systemic insecticide with contact and stomach action, and repellent properties. Gives rapid knockdown and long residual activity.

Usage: Control of a wide spectrum of insect pests, e.g. aphids, Colorado beetles, thrips, Lepidoptera larvae, Coleoptera larvae and adults, etc., in cereals, hops, ornamentals, potatoes, vegetables, cotton, and other crops. Provides good control of insect-borne plant viruses. Also used for control of insect pests in public health.