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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。
The results of virulence test showed that the LC50 (18.86 mg / L) was the lowest when the ratio of carbaryl and chlorpyrifos was 1:124, and the co-toxicity coefficient was the highest (156.02), with the highest synergistic effect. The results of field trials showed that the control effect of 25% carbaryl chlorpyrifos 600 ~ 1200 mL / hm2 on C. medinalis was 86.40% ~ 94.42% on day 7 after drug treatment, showing strong stomach toxicity and contact toxicity , No significant difference compared with the control drug chlorpyrifos and emamectin benzoate EC; Control effect of 600 ~ 1200 mL / hm2 chlorpyrifos water emulsion on the rice leaf roller Cnidormia insignis at 14 d after treatment Was 76.92% ~ 88.00%, which was not significantly different from that of the control drug chlorpyrifos (77.17%), which was significantly better than that of emamectin benzoate EC (55.00%) and 25%. The effect of chlorpyrifos emulsion on rice leaf roller is 1200 mL / hm2, which is 79.24%. 25% methylparaben chlorpyrifos water emulsion for the control of rice leaf roller larvae of the optimum period for the incubation period and young larvae peak, the recommended dose of 900 ~ 1200 mL / hm2, application should be selected in the absence of dew even thin spray.