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苹果白粉病Podospnaera leucatricha(Ell et Ev.)Salm.分布普遍,为害严重,是我省苹果、槟沙果、梨树的重要病害。据1978年祁县天居大队调查,槟果树病叶率达84.2％,病梢占67.3％;祁县、太谷等县苹果树感病品种红玉、倭锦、祝光等病叶率达63.8％,病梢占35.7％。果树感病后,
Apple powdery mildew Podospnaera leucatricha (Ell et Ev.) Salm. Distribution is widespread, serious damage, is an important disease in our province apple, Penang sand, pear. According to a survey conducted by the Qixian Tianju Brigade in 1978, the leaf rate of the diseased betel tree reached 84.2% and the disease tip accounted for 67.3%. The susceptible diseased leaves such as red jade, buddhist tree, 63.8%, disease accounted for 35.7%. After the fruit tree is sick,