Insecticide Resistance Study in Plutella xylostella (L.) VI. An Experimental Analysis of Organophosphorus and Synthetic Pyrethroid Resistances

Abstract

The organophosphorus and synthetic pyrethroid resistances in diamondback moth, Plutella xylostells (L.), were compared in two groups of resistant strains. The first group consisted of seven field strains which carried mixed origins of resistance; the second group were six laboratory-bred strains specially selected by designated insecticides so that the insects with known origins of resistance. The resistance and cross resistance characters of laboratory-bred strains are used in analyzing and explaining the test results of field strains.有機磷及合成除蟲菊精類殺蟲劑爲本省蔬菜常用藥劑，亦爲小菜蛾之主要防治藥劑。由於小菜蛾已對此二類化合物產生高度抗藥能力，常導致防治困難及用藥過量之殘毒問題，此研究係對此二類主要防治用藥之效能加以澄清，並對小菜蛾抗藥反應之特質進行深入瞭解，期能在化學防治之策略上運用所得資料，提供有效的改進措施。