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Common name carbaryl (BSI, E-ISO, (m) F-ISO, ANSI, ESA, BAN); NAC (JMAF); sevin* (former exception, USSR)
IUPAC name 1-naphthyl methylcarbamate
Chemical Abstracts name 1-naphthalenyl methylcarbamate
CAS RN [63-25-2]
PHYSICAL CHEMISTRY
Composition Tech. grade is ³99% pure. Mol. wt. 201.2 M.f. C12H11NO2 Form Colourless to light tan crystals. M.p. 142 ºC V.p. 4.1 ´ 10-2 mPa (23.5 ºC) KOW logP = 1.85 Henry 7.39 ´ 10-5 Pa m3 mol-1 (calc.) S.g./density 1.232 (20 ºC) Solubility In water 120 mg/l (20 ºC). Readily soluble in polar organic solvents. In dimethylformamide, dimethyl sulfoxide 400-450, acetone 200-300, cyclohexanone 200-250, isopropanol 100, xylene 100 (all in g/kg, 25 ºC). Stability Stable under neutral and weakly acidic conditions. Hydrolysed in alkaline media to 1-naphthol; DT50 c. 12 d (pH 7), 3.2 h (pH 9). Stable to light and heat. F.p. 193 °C
APPLICATIONS
Biochemistry Weak cholinesterase inhibitor.
Mode of action Insecticide with contact and stomach action, and slight systemic properties.
Uses Control of Lepidoptera, Coleoptera, and other chewing and sucking insects, at 0.25-2.0 kg a.i./ha, on more than 120 different crops, including vegetables, tree fruit (including citrus), mangoes, bananas, strawberries, nuts, vines, olives, okra, cucurbits, peanuts, soya beans, cotton, rice, tobacco, cereals, beet, maize, sorghum, alfalfa, potatoes, ornamentals, forestry, etc. Control of earthworms in turf. Used as a growth regulator for fruit thinning of apples. Also used as an animal ectoparasiticide. Phytotoxicity Non-phytotoxic if used as directed. Under certain conditions, some varieties of apple and pear may be injured.