【摘要】 毒力测定结果表明,甲维盐、毒死蜱的比例为1∶124时,对稻纵卷叶螟的LC50(18.86mg/L)最低,共毒系数(156.02)最高,增效作用最大。田间试验结果表明,药后7 d,25%甲维.毒死蜱水乳剂600~1200 mL/hm2对稻纵卷叶螟的防效为86.40%~94.42%,表现出较强的胃毒、触杀性,与对照药剂毒死蜱乳油、甲氨基阿维菌素苯甲酸盐乳油无显著差异;药后14 d,25%甲维.毒死蜱水乳剂600~1200 mL/hm2对稻纵卷叶螟的防效为76.92%~88.00%,与对照药剂毒死蜱乳油的防效(77.17%)无显著差异,显著优于甲氨基阿维菌素苯甲酸盐乳油的防效(55.00%);25%甲维.毒死蜱水乳剂对稻纵卷叶螟的保叶效果以1200 mL/hm2为最好,达79.24%。25%甲维.毒死蜱水乳剂防治稻纵卷叶螟的适期为卵孵盛期和低龄幼虫高峰期,推荐剂量为900~1200 mL/hm2,施用方式应选择在无露水时均匀细喷雾。更多还原

【Abstract】 The result of the biological activity test showed that the LC50 and co-toxicity coefficient(CTC) of the mixture of emamectin benzoate and chlorpyrifos at the ratio of 1∶124 against the larvae of Cnaphalocrocis medinalis were the lowest(18.86 mg/L) and the highest(156.02),respectively,indicating this mixture had the greatest synergism.The results of field trials of 25% emamectin benzoate·chlorpyrifos(1∶124) EW showed that the mixture reagent had favorable stomach action and contact action.The control effect of 25% emamectin benzoate·chlorpyrifos EW at the dose of 600～1200 mL/hm2 against the larvae of Cnaphalocrocis medinalis was 86.40%～94.42% after 7 days,76.92%～88.00% after 14 days,which were all much better than that of emamectin benzoate or chlorpyrifos.The leaf protection effect of 25% emamectin benzoate·chlorpyrifos EW at the dose of 1200 mL/hm2 was 79.24% after 14 days.So 25% emamectin benzoate·chlorpyrifos EW at the dose of 900~1200 mL/hm2 is recommended for control of Cnaphalocrocis medinalis.更多还原