Fate of Thiobencarb Sainey Ceesay Environmental Monitoring Branch Department of Pesticide Regulation

S-[(4-chlorophenyl) methyl]diethylcarbamothioate General information This document reviews the environmental fate and environmental effects of the thiocarbamate herbicide, thiobencarb {S–[(4-chlorophenyl) methyl] diethylcarbamothioate (C 12 H 16 ClNOS)}. Thiobencarb, also referred to as benthiocarb was developed by Kumiai Chem. Ind. Co. Ltd and introduced in the market in 1970 (Ishikawa, 1981). It was introduced in California as the active ingredient of the rice herbicides Bolero ® and Abolish ®. Bolero® is a granular/flake herbicide which is applied to rice field water post-flood. Abolish ® is an emulsifiable concentrate herbicide, applied pre-plant, pre-flood directly to the soil, or post-flooded, post-emergence to drained fields. Both products are applied at an application rate of up to four pounds active ingredient per acre. Both have a narrow window of application (after rice plant grows to 1 1/2 leaf stage, and after watergrass or barnyardgrass grows past the 1 1/2 leaf stage), and applied primarily by air (Newhart, 2000).