Chlorinated Hydrocarbon Insecticides Used Alone and in Combinations for Grasshopper Control

Abstract

Each of 7 chlorinated hydrocarbons and 3 phosphates was evaluated for stomach and contact effectiveness in laboratory tests on Melanoplus differentialis. LD50 values were detd. for combinations of the hydrocarbons in groups of 2, at 3 different ratios. Small-plot field tests also were run on most of these same compounds and on some of the combinations. 3 new materials tested for the first time were more toxic to grasshoppers than either chlordan or chlorinated camphene.