Bt制剂防治菜青虫的田间试验

Field Tests of Bt Control to Cabbage White Butterfiy Pieris rapae (Linnaeus)

两年三项田间试验的结果表明,应用Bt制剂(HD-1)防治菜青虫具有良好防治效果,而且虫龄越大,防效越高,尤其防治4～5龄幼虫的校正死亡率可达90％至100％。

Three Field Tests of Control With Bt (HD-1) to the cabbage white butterflypieris rapae (L.) were investigated in 1983～1984. The results showed that the Cabbagewhite butterfly effectively controlled by Bt. The control efficacy were increasing follwed theincrease of larvae instar, especially from larvae the fourth to the fifth instar, the efficacyreached to 90-100% in fields.