Abstract
Three new compounds, Ciba C-9491 (O-(2,5-dichloro-4-iodophenyl) O,O-dimethyl phosphorothioate), Cardona® (2-chloro-l-(2,1,5-trichlorophenyl)vinyl dimethyl phosphate), and Penick SBP-1382 ((5-benzyl-3-furyl) methyl 2,2-dimethyl-3-(2-mcthylpropenyl) cyclopropanecarboxylate (ca. 70% trans, 30% cis isomers)), all showed greater toxicity than malathion to larvae of the Indian meal moth, Plodia interpunctella (Hübner), in topical-application tests. Cardona was also more toxic than malathion to adult cigarette beetles, Lasioderma serricorne (F.), and confused flour beetles, Triboliumconfusum Jacquelin duVal. Bay 75546 (O-(3-bromo-5,7-dimethylpyrazolyl[1,5-a]pyrimidin-2-yl) O,O-diethyl phosphorothioate), Bay 79845 (O-(3-chloro-5,7-dimethylpyrazolyl[1,5-a]pyrimidin-2-yl) O,O-diethyl phosphorothioate), Ciba C-9491, and Penick SBP-1382 were all very toxic to larvae of the black carpet beetle, Attagenus megatoma (F.), but were less effective than malathion when comparisons were made at the LD05level.
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