Common pests and diseases of walnuts include rot disease, ulcer disease, beetle, ruler, and scale insects.
Control methods: remove diseased fruit, diseased branches, deep burial or burning. Planting plant spacing should be appropriate, maintain good ventilation, and find the diseased fruit in time to remove and spray 1:2:200 times Bordeaux mixture or spray 25% charringer WP 500 times solution, 10-15 days once in a row 2-3 times Do a good job in clearing the garden and reduce the source of pests and diseases. When the larvae hatch from early spring to early summer, they spray 600 times of insecticides to control the beetles and the scales. Insect pests and other pests, in the end of autumn, use a knife to scrape the diseased bark and apply 100 times Fumei arsenic solution to prevent dry rot and ulcer disease.
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