Cabbage Looper: Effect of Temperature on Toxicity of Insecticides in the Laboratory1

Publisher Website
Google Scholar
Abstract
The effect of different posttreatment temperatures on insecticides against Trichoplusia ni (Hübner) was studied in the laboratory. Insecticides were administered as treated leaves (leaf-dip test) or by topical application. In leaf-dip tests, toxicity of methomyl was essentially unaffected by temperature. A decrease from 32° to 10°C resulted in losses of toxicities of 1.5× with Monitor® (O, S-dimethyl phosphoramidothioate) 3× with mevinphos and methyl parathion. 10× with endosulfan, and 20× with monocrotophos. Effectiveness of Bacillus thuringiensis Berliner fell sharply below 32°C, and no mortality occurred at 4°C. In topical tests, toxicity of mevinphos was unaffected by temperatures above 10°C. A decrease from 32° to 10°C resulted in losses of toxicities of 2× with naled, 3× with methomyl and monocrotophos, 4.5× with Monitor, and 26× with methyl parathion. Endosulfan was ineffective below 21°C.

This publication has 0 references indexed in Scilit: