Abstract
Several new insecticides and mixtures were evaluated in the field for control of Spodoptera littoralis (Boisduval). Bioassay was performed in the laboratory with S. littoralis larvae, to determine effectiveness of insecticide residues from the field. Many materials showed strong ovicidal action with some having LT50 values extending to 9–10 days. As larvicides, none of the tested materials had an LT50 longer than 7 days. There was good correlation between laboratory and field tests. Abate® (O, O -dimethyl phosphorodithioate O, O -diester with 4,4′-thiodiphenol) and CIBA 8514 (NŃ -(4-chloro- O -tolyl)- N, N -dimethylformamidine) were good ovicides but poor larvicides. Considering results from all tests, the 2 experimental insecticides, E. I. 47031 (cyclic ethylene (diethoxyphosphinyl) dithioimidocarbonate), E. I. 47470 (cyclic propylene (diethoxyphosphinyl) dithioimidocarbonate) -and a mixture of endrin-Bidrin® (3-hydroxy- N, N -dimethyl- cis -crotonamide dimethyl phosphate) were the most promising.
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