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How to treat the walnut tree longicorn beetle?

Anoplophora longicorn larva is a wood-boring insect. When it was very young, it began to eat wood under the bark. This hole is not easy to find, but it is not difficult to find as long as you pay attention, because each hole is blocked by several insect droppings. The cure is: soak some cotton (other pesticides will do) with dimethoate stock solution, and insert it when you see a wormhole, not too much, just block the hole. This is almost the only way.