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梨黑星病(Venturia pirina Aderh.)是北京地区梨树(Pyrus spp.)上主要病害之一.我们在1984～1986年的调查结果表明该病在北京密云库北地区发生普遍.一般年份病叶率达30～40%,流行年份发病严重的果园病叶率达95%以上,病果率达33%以上.对梨的产量和品质造成很大影响.目前各果园都比较重视对梨黑星病的防治.但是由于病害的发生和流行受不同年份的降雨量及降雨时间影响较大,以及在喷药的时间和用药品种上还存在许多问题,因此防治效果很不稳定,往往造成较大的损失.为了提高对梨黑星病的防治水平,1985～1986年我们在密云县栗棒寨村开展了梨黑星病化学防治适期及8种杀菌剂田间防治效果试验.
Venturia pirina Aderh. Is one of the major diseases in Pear (Pyrus spp.) In Beijing. Our survey from 1984 to 1986 showed that the disease was common in the northern area of Miyun, Beijing. Leaf rate of 30 ~ 40%, epidemic year serious disease orchard disease leaf rate of 95% or more, the disease rate of 33% or more. The pear yield and quality have a significant impact .Currently, the orchards are more emphasis on pear black However, as the occurrence and prevalence of diseases are greatly affected by rainfall and rainfall time in different years, and there are still many problems in spraying time and variety of drugs, the control effect is very unstable, Large losses.In order to improve the prevention and control of pear scab, 1985 ~ 1986 we carried out in Miyun County chestnut Zhaicun chemical control of pear scabies suitable period and eight kinds of fungicides field control effect test.