The powder that appears on the trunk should be insect feces, and more specifically, the feces that the red neck beetles mainly harm. This worm occurs one generation a year, which mainly damages the branches. Adults emerge in June of each year, and they copulate on the branches after they bite and groove. After the eggs hatch, the larvae gradually deepen the hazard. The insects bend and directly drill the xylem and continue to harm before the pupation. Preventive measures: Pay attention to catching adults and spraying lime slurry on the branches to impede adult oviposition. After discovering early signs of harm, artificially remove larvae. Hydrogen peroxide tablets block Tianniu Cave and kill the larvae by release of gas.
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