Control of Caterpillars on Cabbage in the Ottawa Valley of Ontario and Quebec, 1956-19571

Publisher Website
Google Scholar
Abstract
In 1957, 92 to 85% control of the imported cabbageworm, Pieris rapae (L.), the diamondback moth, Plutella maculipennis (Curt.), und u DDT-resistant strain of the cabbage looper Trichoplusia ni (Hbn.), on late cabbage was obtained with four applications of the following insecticides; 1% endrin dust at 0.25 lb. of toxicant per acre, 2½% Guthion dust at 0.75 lb., and Phosdrin emulsible concentrate at 0.75 lb. The cabbage looper was not controlled with four applications of the following: 1% parathion dust at 0.33 lb. of toxicant per acre, 3% DDT dust at 1.0 lb., 4% malathion dust at 1.0 lb., 5% toxaphene dust at 1.5 lb., and 1% rotenone dust at 0.33 lb. In 1956, the eight insecticides gave 97 to 87% control of the imported cabbageworm and the diamondback moth, populations of the cabbage looper being almost negligible. Comparison of present and past effectiveness of DDT did not suggest development of strains of the imported cabbageworm resistant to this material.

This publication has 0 references indexed in Scilit: