The Occurrence of Insecticide Resistance in Three Lepidopterous Pests on Vegetables

Abstract

The imported cabbageworm, Pieris rapae Boisduval; the tobacco cutworm, Spodoptera litura Fabricius; and the cabbage looper, Trichoplusia ni Hübner, were sampled from several major vegetable growing areas for the insecticide susceptibility study. For each species, susceptibilities differ among sampled populations resulted from resistance. The finding of this investigation indicated that the imported cabbageworms were free from the resistance problem and chemical control is a very effective measure for controlling this pest. 本省歷年來蔬菜之蟲害保護工作多仰賴殺蟲劑，以致近年來害蟲相較趨於單純，但使用藥劑時，常有效果減退之現象發生。查其原因，可能係害蟲已對常用殺蟲劑產生不同程度之抗藥能力，小菜蛾，Plutella xylostella (L.)，即是一已經證實且抗藥問題極嚴重之十字花科蔬菜害蟲。此外，在十字花科蔬菜上經常發生的鱗翅目害蟲尚有紋白蝶，Pieris rapae Boisduval、斜紋夜盜Spodoptera litura Fabricius及擬尺蠖Trichoplusia ni Hübner。爲暸解後三種害蟲是否亦對殺蟲劑產生某種程度之抗藥力，乃進行本研究。