Symptoms - the main damage to the leaves (positive irregular yellowish translucent oil-immersed small spots, gradually enlarged green, marginal boundaries are not obvious, mostly several small spots connected into an irregular or polygonal lesions, and On the back of the leaves, a yellow-white frosty layer of mildew develops. The lesions turn pale brown in the later stages of the lesions, dry and fissured and curled, and the leaves fall off in severe cases. They also damage new shoots, buds and young fruit. (The young shoots also show oil or water immersion.) Lesions, surface yellow-white mold, lesions spread faster in the longitudinal direction, the color gradually becomes brown, a little sunken, serious new shoots stop growing and twisted to death; young fruit disease early, the disease department becomes light green, late The lesions turn dark brown and subside, resulting in a layer of frosty white mold, which causes the fruit to harden and shrink.When the fruit is half-large, it suffers damage, the disease department browns down, shrinkage and soft rot easily fall off, but no mold layer occurs, and there are few The diseased fruit shrinks in the tree and generally does not develop from coloration to maturity.)
Control methods - eliminate pathogens (timely, thorough removal of diseased branches, diseased leaves, diseased fruit, concentrated burns); timely cutting off redundant auxiliary branches and leaves; pay attention to drainage in the rainy season, pay attention to reduce the chance of soil overwintering spores being splashed on the leaves; Phosphorus and potassium fertilizers were applied in excess, and lime was used in acidic soils. A small amount of Bordeaux mixture was sprayed every 10 days before the onset of illness to protect it; 50% Kedecane 5000 times or 65% Zeoxin 500 times immediately after onset. Or 40% EB aluminum 200 times or 25% metalaxyl 800 ～ 1000 times liquid or 58% thiazole manganese Zn wet powder 600 times. In addition, 25% Methorsine wettable powder 20000 times and Daisen Zinc, mancozeb, Fumei double 1000 times better, and can simultaneously treat other diseases occurring in the same period.
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