【摘要】 采用浸渍法测定了甲基对硫磷等10种药剂对棉铃虫卵和初孵幼虫的毒力。结果表明,阿维杀虫素、氰戊菊酯、甲基对硫磷、丙溴磷、灭多威不仅对棉铃虫卵孵化有较高的抑制率,而且对初孵幼虫也有很强的毒力;硫丹甲胺磷、水胺硫磷虽然对卵孵化抑制率不高,但对初孵幼虫的毒力还是很高的。久效磷和辛硫磷对卵和初孵幼虫毒力都很差。讨论了卵的发育阶段、药剂浓度、浸渍时间与药剂毒力的关系。更多还原

【Abstract】 The larvicidal and ovicidal activity of ten insecticides including parathion-methyl were eva- luated with immersion method.Eggs were diped in dilutions for 5 or 60 seconds then transferred to petridishes and incubated at 25℃±1℃.The percentages of eggs that failed to hatch were counted and the mortality of early-instar larvae were counted.The result shows that the control rate of hatching and mor- tality of larvae were both high in avermectin,fenvalerate,parathion-methyl,profenofos and methomyl, while the control rate was not high hut the mortality was high in endosulfan,methamidophos and isocar- bophos.Neigher of each was high in phoxim or monocrotophos. It also discussed the effect of the development period of eggs,the concentration of insecticides and im- mersion time on the larvicidal and ovicidal activity of these insecticides to cotton bullworm(Heliothis armigera).更多还原