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梨叶枯病是甘肃省梨树上近几年发生的一种新病害 ,仅分布在甘肃临夏、兰州、定西和天水等地。发病梨园病叶率多为 6 0 %～ 10 0 % ,病情指数 4 0～90 ,病叶上布满病斑 ,引起叶枯早落 ,树势早衰 ,严重影响梨树生长、果实品质和产量。发病初期叶片正面产生直径 0 5～ 1ｍｍ的紫
Pear leaf blight is a new disease occurred in pear trees in Gansu Province in recent years, only distributed in Linxia, Lanzhou, Dingxi and Tianshui of Gansu Province. The incidence of pear leaf disease rate was 60% ~ 100%, the disease index of 40 ~ 90, diseased leaves covered with lesions, causing leaf dry early, tree premature aging, seriously affecting pear growth, fruit quality and yield . Early onset of leaves positive diameter 0 5 ~ 1mm purple