Abstract
Basil' toxicities of compounds against Scutigerella immaculata Newport were determined by bioassay methods. To simulate field conditions, bioassay tests were conducted by mixing insecticides with required amounts of soil to give mixtures that contained 2.5 p.p.m. of the insecticides. With the exception of lindane, the chlorinated hydrocarbons had little effect on this pest. Of the 46 compounds tested, only parathion, UCC 8305 (P-chloro-2, 4-dioxa-5-methyl- P-thiono-3-phosphabicyclo (4.4.0) decane), V-C 13 ( O -2,4-dichlorophenyl O,O -diethyl phosphorothioate), Am. Cyanamid E.N. 18133 ( O,O -diethyl O -2-pyrazinyl phosphorothioate) and lindane were initially toxic and possessed some degree of residual effectiveness. Am. Cyanamid E.N. 18133 gave outstanding results and appeared to be the most promising of the insecticides tested.
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