Effect Analysis of Different Injection Time and Injection Sites for the Prevention of Cryptorrhynchus lapathi

In this experiment,pesticides were injected into stems of 5 year-old poplar trees to control Cryptorrhynchus lapathi at different time and different drilling sites.The results showed that the prevention and control rate of three different injection parts were respectively 85%,87% and 85%,under the average daily temperature of 7.8℃~21.4℃.While the prevention and control rate reduced to 49%,51% and 52% respectively,as the average daily temperature varied from 12.6℃ to 25.8℃.The effect of prevention and control was not significant on different drilling sites.