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烟台市自20世纪90年代中后期开始推广普及苹果套袋技术以来,套袋苹果上就出现了一种新的病害——黑点病。该病虽不导致果实腐烂,但影响果实的外观质量,发病轻的果实可达到三级果,重病果全是等外果。在不同年份、不同果园,这种病的发生范围、发生程度差异很大。发病严重的果园,病果率高达60%以上,经济损失很大。一、症状表现黑点多发生在萼洼内及果顶部、果肩部,黑点直径多为1～3mm,有些黑点中央有白沫状果胶。黑点病的发生与天气因素、纸袋的防水性和透气性、树势、
Yantai City Since the mid-to-late 1990s, widespread popularization of apple bagging has taken place on bagged apples, a new disease called black spot disease. Although the disease does not lead to fruit decay, but the appearance of the quality of the fruit, the incidence of light fruit can reach three fruit, all the serious consequences of such extra-fruiting. In different years, different orchards, the incidence of this disease, the occurrence of a great degree of difference. Serious orchard disease, the disease rate as high as 60%, a great economic loss. First, the symptoms of black spots occur in the calyx depression and the top fruit, fruit shoulder, mostly black spot diameter of 1 ~ 3mm, some dark spots central pectin white foam. Occurrence of black spots and weather factors, paper bag waterproof and breathable, tree potential,