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Control measures: (1) trunk injection. Depending on the size of the tree, 4 to 8 oblique holes are drilled down to the base of the trunk to reach the xylem. Each hole is filled with 2 to 3 ml of liquid medicine. It is advisable to use intravital drugs, such as 40% omethoate EC 1 to 2 times. Liquid and so on. This is the most effective method to control poplar moths and leaf-feeding pests. It can be used as both a moth-eaten leaf-feeding pest and a calf-like stem-feeding pest. (2) crown spray. High-strength spraying mechanical spraying 20% ​​cypermethrin EC 2000 ~ 3000 times, or 20% diflubenzuron suspension 5000 ~ 8000 times, or 20% imidacloprid soluble liquid 1000 ~ 2000 times liquid control. Spray should be even and thoughtful, there are fish ponds around the forest should not use high-range mechanical spraying. (3) Physical control. Manual removal of leaf-bearing eggs and insects, reduce the source of insects; the use of black light lamp to kill the moths and worms.
Prevention and control of poplar leaf pests should not be ignored
During the Meiyu period this year, the temperature was low and there was more rain, which had a certain inhibitory effect on the occurrence of leaf-eating pests in poplars. However, production and control could not be relaxed. On the one hand, there are overlapping generations of leaf-feeding pests such as Yangshan moths and Yang Xiaogong moths. The third-generation larvae have emerged. There are second-generation larvae, pupa and adults at the same time. The prevention and control are difficult; on the other hand, the temperature is rapid after the Meiyu period ends. Ascending, the moth-eaten leaf-feeding pests will quickly reproduce the hazards and enter the peak of the hazard. According to another survey, the larvae of the first generation moths (green thorn moths, yellow thorn moths, etc.) have entered a peak period of damage, and a few plots have been jeopardized. At present, it is necessary to strengthen pest monitoring and adopt effective and effective measures for prevention and control.