The disease with a high incidence of walnuts in the high-temperature, wet-rain season is the bacterial black spot of walnuts.
Symptoms: Injured green young fruit, brown oil-like spots on the initial skin, expanded into a round or irregular shape, no obvious edges, surrounded by water-immersed halo, serious lesions, deep in the inner peel (Core and shell), and make the whole peel black and rot, the nuts dry, fall early. Leaf lesions less, dark brown, nearly round or polygonal, semicircular appearance of oil-immersed halo around the outer edge, when severe lesions joint, leaf shrinkage, dry coke, petiole darkened, micro depression.
Control methods: First, combine pruning to remove diseased branches and diseased fruits; secondly, use 50% thiophanate-methyl or tetanus WP 500 to 800 times, half a month, and spray three times; Scratch dark spots on the stumps and brush them with a brush until they do not foam. Leave them at intervals of 10 days and brush again.
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