经室内测定和田间试验表明 ,体积分数 40 %水胺硫磷乳油、体积分数 2 8%棉虫净乳油等对棉铃虫卵具有较强的杀伤力 ,可作为卵期防治用主选药剂。体积分数 30 %甲久乳油混剂对抗性棉铃虫毒力达显著增效作用 ,大田药效试验 10 0 0～ 15 0 0倍防效达 90 % ,达到或超过常用混剂体积分数 30 %灭铃灵乳油 15 0 0倍及体积分数 5 %来福灵乳油 2 0 0 0倍 ,且具有成本低 ,残效期长的优点 The indoor test and field test showed that the volume fraction of 40% amethion EC, 28% of the volume of cotton insecticide net EC has strong lethality to the eggs of cotton bollworm, which can be used as the main drug for egg control. The volume fraction of 30% methylprednisolone mixture had significant synergistic effect on the virulence of resistant cotton bollworm. The field efficacy test was 90% at 10 0 ~ 150 times, reaching or exceeding 30% of the volume fraction of common mixture Ling Ling EC 150 times and volume fraction 5% Laifu EC 200 times, and has the advantages of low cost, long residual period