Pear stem bee mainly harms the shoots and stems of pear trees, and the adult is most severely damaging during the oviposition period. Therefore, it is also known as larvae, truncated buds, and the like. The adults lay their eggs in the newly formed xylem under the tender shoots, causing the new shoots to fall off and hang on the branches. The wind blows off after 2-3 days. At the same time, the adults cut the lower leaves of the ovipositor from the middle of the petiole. Broken, causing the leaves to fall. After hatching, the larvae hunted down the young xylem of the new shoot and left the epidermis. The worms were defecate in the insect tract, and the hollowed out part turned dark brown and formed a dark brown dried cocoon. According to a survey conducted on April 1st in Zhongshan Road and Cucumber Hill, the adults of Pyrus sinensis have already begun to harm. Please ask the towns and offices to actively organize personnel for prevention and treatment to minimize the damage to pear trees. Prevention and control measures (l) Cut the worms and cut them out 10 days after flowering to kill eggs or larvae. Continuous operation in a large area of ​​pear orchard can receive good results. (2) Control of the spraying of insects in the adult stage. The insects have serious damage to the unflowered saplings. They can be sprayed when they have just fallen, and they can be sprayed with 2000 times liquids such as cypermethrin and deltamethrin.
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