Tests on Various Types of Insecticides to the Larvae of the Armyworm; Leucania separate Walker (Noctuidae : Lepidoptera)

Abstract

Chemical control of the lepidopterous insects, including the armyworm L. separate Walker, a sporadic pest of cereal crops, has varied in effectiveness (9). This variation may be associated with the feeding habits of the species, or with the stage of larval development at which chemical control is directed. Differences in the susceptibility of insects at various stages of development to chemicals has been reported for contact insecticides in the past decade by Mukerjea (8). So far as L. separate Walker has become a serious pest, there is a lack of basic toxicological information about the effects of various types of insecticides. This study was undertaken at the laboratory of Applied Entomology and Nematology, Nagoya University, Japan to determine the susceptibility mainly in larval stages to typical chlorinated hydrocarbons, carbamates and organo phosphorus insecticides.