螺虫乙酯对烟粉虱的防治效果评价

采用室内毒力测定与田间试验相结合的方法，研究了螺虫乙酯（Movento）对烟粉虱的防治效果。室内毒力测定结果表明：96 %螺虫乙酯原药对烟粉虱卵和若虫都具有非常高的杀虫活性，LC50分别为18.91 mg?L-1和14.97 mg?L-1，与对照95 %吡虫啉没有显著差异|但对烟粉虱成虫的杀虫效果并不十分理想，LC50达到了453.34 mg?L-1，且显著高于对照95 %吡虫啉。田间试验结果表明：24 %螺虫乙酯悬浮剂（SC）对烟粉虱有良好的防效和持效性，且螺虫乙酯与Biopower（助剂）混用的防效明显优于螺虫乙酯单独使用的效果|螺虫乙酯与0.2 %〔0.24 g?（667 m2）-1〕Biopower混用，药后1～28 d对烟粉虱的防效分别为64.91 %～66.92 %、82.00 %～82.59 %、88.11 %～89.97 %、89.99 %～93.94 %和91.10 %～93.56 %。

Evaluation on the Effect of Spirotetramat on Controlling Bemisia tabaci

The bioassay research of spirotetramat in Bemisia tabaci egg，nymph and adult were investigated．96 % movento showed high toxicity to egg and nymph of B.tabaci，which had no significant difference compared with that of 95 % imidacloprid used as a controlling pesticide and LC50 were 18.91 mg?L-1 and 14.97 mg?L-1，respectively．However，96 % movento showed low toxicity to adult of B.tabaci and LC50 were up to 453.34 mg?L-1，which was significantly higher than that of 95 % imidacloprid．On the other hand，24 % movento SC has good control effect and persistence to B.tabaci through field experiment．The combinations effect of movento and biopower were obviously better than that of movento used alone．The results showed that control effects of 24 % movento SC biopower 0.2 %（3.6 g?hm-2）were 64.91 %-66.92 %，82.00 %-82.59 %，88.11 %-89.97 %，89.99 %-93.94 % and 91.10 %-93.56 % after spaying 1-28 days，respectively．