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silafluofen
Insecticide
IRAC 3; non-ester pyrethroid
NOMENCLATURE
Common name silafluofen (BSI, pa E-ISO)
IUPAC name (4-ethoxyphenyl)[3-(4-fluoro-3-phenoxyphenyl)propyl](dimethyl)silane
Chemical Abstracts name (4-ethoxyphenyl)[3-(4-fluoro-3-phenoxyphenyl)propyl]dimethylsilane
Other names silaneophan CAS RN [105024-66-6] Development codes AE F084498 (AgrEvo); Hoe 084498 (Hoechst); Hoe 498 (Hoechst)
PHYSICAL CHEMISTRY
Mol. wt. 408.6 M.f. C25H29FO2Si Form Liquid. B.p. Decomposes, without boiling, above 170 ºC V.p. 2.5 ´ 10-3 mPa (20 ºC) (vapour pressure balance) KOW logP = 8.2 Henry 1.02 Pa m3 mol-1 (calc., 20 °C) S.g./density 1.08 (20 ºC) Solubility In water 0.001 mg/l (20 ºC). Soluble in most organic solvents. Stability Stable over a period of 2 years, when stored in original unopened containers at 20 ºC. F.p. >100 ºC (closed cup)
COMMERCIALISATION
History Patented by Katsuda in Japan in 1986, and by Hoechst (now Bayer CropScience) in Europe in 1987. Introduced by Dainihon Jochugiku in Japan as a termiticide and, in 1996, by Hoechst as an insecticide. Patents EP 224024 Manufacturers Bayer CropScience
APPLICATIONS
Mode of action A broad-spectrum insecticide which acts mainly as a stomach poison, but also by contact. Uses Control of Coleoptera, Diptera, Heteroptera, Homoptera, Isoptera, Lepidoptera, Orthoptera, and Thysanoptera. Application rates in rice and cotton 50-300 g/ha, soya beans 50-200 g/ha, tea 10-20 g/hl, coffee 50-100 g/ha, vegetables 50-150 g/ha, turf 10 g/hl, deciduous fruit trees (including persimmon and citrus) 10-20 g/ha, mangoes 10-15 g/ha. Formulation types DP; EC; EO; WP. Compatibility Good compatibility when mixed with Bordeaux mixture or DCPA.
OTHER PRODUCTS
'Joker' (Bayer CropScience); 'Mr Joker' (Bayer CropScience, Ishihara Sangyo); 'Silatop' (Bayer CropScience); 'Silonen' (Bayer CropScience, Dainihon Jochugiku)
ANALYSIS
Details available from Bayer CropScience.
MAMMALIAN TOXICOLOGY
Oral Acute oral LD50 for male and female rats >5000 mg/kg. Skin and eye Acute percutaneous LD50 for male and female rats >5000 mg/kg. Inhalation LC50 (4 h) for rats >6.61 mg/l air. Other Non-teratogenic and non-mutagenic.
ECOTOXICOLOGY
Birds Acute LD50 for Japanese quail and mallard ducks >2000 mg/kg. Fish LC50 (96 h) for carp and rainbow trout >1000 mg/l. Daphnia LC50 (3 h) 7.7 mg/l; (24 h) 1.7 mg/l (both Japanese guidelines). Bees Oral LD50 (24 h) 0.5 mg/bee (lab. test). Worms LD50 for earthworms >1000 mg/kg.
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