Answer: 1. A strict plant quarantine system is implemented. Disease-free scions and rootstocks are used when raising seedlings, and diseased seedlings are removed and burned. 2, the bark cut "door" shape, coated with 500,000 units of tetracycline, or 1.5 million units of oxytetracycline, or 1.5 million units of streptomycin, and then wrapped with a plastic film, can reduce the incidence of disease. It is also possible to dig a pit from the east, west, south and north below the canopy, find a root of 0.5 to 1 cm, and cut off and insert a bottle containing tetracycline, oxytetracycline, streptomycin, or griseofulvin 150 to 200 ppm. In the seal buried. Treatment in the second half of April, late June and early August can achieve significant results.
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