为了延长农药的使用寿命 ,提高对棉铃虫的防治效果 ,减少用药量和减轻环境污染 ,保护天敌 ,1 993～ 1 998年笔者对防治棉铃虫农药的复配技术和应用效果进行了研究。1　供试材料1 .1　供试农药品种( 1 ) 97%乐果原粉、40 %乐果乳油 ;( 2 ) 76%氧化乐果原油、40 %氧化乐果乳油 ;( In order to extend the service life of pesticides, improve the control effect of the bollworm, reduce the dosage and mitigate the environmental pollution, and protect the natural enemies, the authors studied the compounding and application effects of the pesticides against bollworm from 1993 to 1998. 1 Test materials 1.1 Test varieties of pesticides (1) 97% dimethoate, 40% dimethoate; (2) 76% omethoate, 40% omethoate;