Evaluation of Certain Insecticides for Southern Potato Wire worm Control

Abstract

Parathion, ethylene dibromide, Am. Cyanamid 18.133 (O,O-diethy 0-2-pyrazinyl phos-phorothioate), Shell SD 4402 (1,3,4,5,6,7,8,8-octachloro-3a, 4,7,7a-tetrahydro-4,7-methanophthalan), Thimet (O,O-diethyl S-(ethylthiomethyl) phosphorodithioate), and Diazinon (0,0-diethyl O-(2-isopropyl-4-methyl-6-pyrimidinyl) phosphorothioate) gave 82 to 96% reductions of the southern potato wireworm, Conoderus falli Lane in field plot tests at Charleston, S. C, in 1958. ENT-21,170l2,4-dimethylbenzyl chrysanthe-mumate), D-D mixture, and Nemagon (dibromochloropropane) were inferior. SD 4402 remained quite toxic in the soil for at least 83 days and Am. Cyanamid 18,133 for at least 36 days. Diazinon had longer residual effects than parathion, which showed little toxicity after 36 days.