Persistence of Three IGRs in Stored Wheat

Publisher Website
Google Scholar
Abstract
The persistence of residues of three insect growth regulators (IGRs)—BAY SIR 8514 [1-(4-trifluoromethoxypheny1)-3-(2-chlorobenzoy1)urea], diflubenzuron, and methoprene—in stored wheat was studied over a period of 12 to 23 months. Based on mosquito bioassays using fourth-stage larvae of Culex quinquefasciatus Say, the residues of BAY SIR 8514 at 1, 5, and 10 ppm declined by almost 50% during the 23-month posttreatment storage. Diflubenzuron at these concentrations showed a residue loss of 40 to 50% during the 23-month study period. The residues of methoprene in stored wheat were determined by gas-liquid chromatography over a period of 12 months. The losses in residues at 1, 5, and 10 ppm were 61, 66, and 62%, respectively.