绿色威雷防治萧氏松茎象药效试验

Efficacy experiment of cypermethrin against Hylobitelus xiaoi

室内用绿色威雷对成虫进行毒力测定，选出致死率较高的浓度为20倍稀释液。用该浓度进行林间药液持效试验，第15天接虫死亡率可达90％。应用该浓度药液于萧氏松茎象成虫刚刚进入产卵期在林间基部喷雾，施药区防治效果可达91．1％。

Cypermethrin （Luseweilei contacted-breaking microcapsule insecticide） was applied to test the control effect on Hylobitelus xiaoi. The results showed that the dilution of 20 times was the more effective concentration. The mortality of Hylobitelus xiaoi adults was above 90% 15 days after the application. In slash pine plantation in Xinfeng County, Jiangxi Province, the contacted-breaking microcapsule of 20 times was sprayed on the lower stem bark of the trees at the time when Hylobitelus xiaoi adults began laying eggs,the control effect was 91.1%.