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杨树灰斑病危害多种杨树,尤其是青杨派的杨树。近年来,黑龙江省大力推广的杨树优良品种小黑杨(Populus simonii x p.nigra)也普遍发生灰斑病。此病蔓延迅速,病情逐年加重。1981年讷河苗圃育小黑杨苗18万亩,普遍发生了灰斑病,严重地块折头率达19.6%。影响了苗木和幼林的正常生长,给育苗生产造成了严重的损失。为了寻求有效的防治方法,1981—1984年我们对杨树灰斑病的发病规律进行了调查研究,并进行了药剂防治试验。
Poplar gray spot disease endanger a variety of poplar, especially poplar trees. In recent years, Gray Poplar also commonly occurs in Populus simonii x p. Nigra, a poplar populace widely popularized in Heilongjiang Province. The disease spread rapidly, the condition increased year by year. Nehe nursery in 1981 raised 180,000 mu of black poplar seedlings, the common occurrence of gray spot disease, the block block rate of 19.6%. Affecting the normal growth of seedlings and young forests, resulting in serious losses in the production of seedlings. In order to seek an effective control method, from 1981 to 1984, we investigated the incidence of poplar gray spot disease and carried out drug control experiments.