Hangzhou Leaflife Chemical Co., Ltd.

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DIAFENTHIURON

 

Insecticide, acaricide

DIAFENTHIURON

NOMENCLATURE
Common name diafenthiuron (BSI, draft E-ISO)
IUPAC name 1-tert-butyl-3-(2,6-di-isopropyl-4-phenoxyphenyl)thiourea 
Chemical Abstracts name N-[2,6-bis(1-methylethyl)-4-phenoxyphenyl]-N'-(1,1-dimethylethyl)thiourea 
CAS RN [80060-09-9]  Development codes CGA 106 630 (Ciba-Geigy); CG-167 

PHYSICAL CHEMISTRY
Composition Tech. is ≥95%.  Mol. wt. 384.6  M.f. C23H32N2OS  Form White powder.  M.p. 144.6-147.7 ºC (OECD 102)  V.p. <2 ×10-3 mPa (25 ºC) (OECD 104)  KOW logP = 5.76 (OECD 107)  Henry <1.28 × 10-2 Pa m3 mol-1 (calc.)  S.g./density 1.09 (20 ºC) (OECD 109)  Solubility In water 0.06 mg/l (25 ºC). In ethanol 43, acetone 320, toluene 330, n-hexane 9.6, n-octanol 26 (all in g/l, 25 ºC).  Stability Stable in air and water, and to light.  pKa Does not dissociate (OECD 112) 
APPLICATIONS
Biochemistry Converted by light, or in vivo, to the corresponding carbodiimide, which is an inhibitor of mitochondrial respiration.  Mode of action Insecticide and acaricide which kills larvae, nymphs and adults by contact and/or stomach action; also shows some ovicidal action. See J. Drabek et al. (Recent Adv. Chem. Insect Control II, 1990, p. 170).  Uses Insecticide and acaricide effective against phytophagous mites (Tetranychidae, Tarsonemidae), Aleyrodidae, Aphididae and Jassidae on cotton, various field and fruit crops, ornamentals and vegetables. Also controls some leaf-feeding pests in cole crops (Plutella xylostella), soya beans (Anticarsia gemmatalis) and cotton (Alabama argillacea). Applied at 300-500 g/ha. Is safe on adults of all beneficial groups (Anthocoridae, Coccinellidae, Miridae) and on adults and immature stages of predatory mites (Amblyseius andersoni, Typhlodromus pyri), spiders (Erigonidae, Lycosidae), and Chrysopa carnea. Non-selective to immature stages of Heteroptera (Anthocoridae, Miridae). Compatible with the biological control of Aleyrodidae and mites in glasshouses.  Formulation types SC; WP.