70%噻虫嗪种子处理可分散粉剂拌种对黄曲条跳甲的室内毒力和田间药效

测定了70％噻虫嗪种子处理可分散粉剂拌种对黄曲条跳甲的室内毒力和田间防效.室内毒力测定结果表明,经拌种处理后,该药剂在菜心出苗后的第3d和第5d,对跳甲成虫有明显的毒杀和拒食作用,其24 h致死中浓度(LC50)分别为6.73％(w/w)和13.8％,拒食中浓度(AFC50)分别为1.09％和3.26％;但高浓度的噻虫嗪(10％和12.5％)对菜心种子出苗有影响,减少了种子的出苗数.田间药效试验结果表明,经拌种处理后,2.5％、5％和7.5％的噻虫嗪明显减少了黄曲条跳甲对幼苗的为害,出苗后1～5 d的防治效果分别为55.16％～46.60％、86.10％～77.15％和89.46％～80.44％.

Toxicity and field trials of seed dressing with 70% thiamethoxam WS against Phyllotreta striolata

The experiment determinate of the efficacy of 70% thiamethoxam WS on Phyllotreta striolata (F.). The result showed that70% thiamethoxam WS have obvious poison and antifeedant effect on adult beetles in the 3 days and 5 days after emergence. The result of the LC50 value of thiamethoxam were 6.73%and 13.8%. The AFC50 value of thiamethoxam were 1.09% and 3.26%.The result of field trial indicated that 70% thiamethoxam WS had high control efficacy against Phyllotreta striolata (Fabricius), but high concentrations may produce effects on Seed Germination. The control effects were 55.16% ~ 46.60%, 86.10% ~ 77.15% and 89.46% ~ 46.60% with the quality percentage of thiamethoxam were 2.5%, 5% and 7.5% after emergence from one to five days.