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白粉病是小麦的主要病虫害之一。近年来由于施肥、播种方式、栽培管理等力面的问题,小麦白粉病发生日趋严重,引起植株早衰,麦粒干秕,降低了产盈和出粉率。据测定,全株发病千粒重下降12.5%,每亩减产32.8公斤,倒二叶以下发病千粒重下降9.9%,每亩减产26.1公斤,倒三叶以下发病千粒重下降2.2%,每亩减产5.8公斤。1981～1986年全县累计减产24950吨,占小麦总产量的13.2%。为了有效地防治白粉病,我们进行了发病因子和综合防治的观察试验。
Powdery mildew is one of the major pests and diseases of wheat. In recent years due to fertilization, sowing methods, cultivation and management problems, the occurrence of wheat powdery mildew is more serious, causing premature aging plants, dry grains of wheat, reducing profitability and output of flour. According to the determination, the whole plant incidence of 1000-grain weight decreased by 12.5%, yield reduction of 32.8 kg per mu, fell down two leaves the incidence of 1000-grain weight decreased 9.9%, 26.1 kg per acre yield, inverted trilobal thousand grain weight decreased 2.2%, 5.8 kg per acre yield. From 1981 to 1986, the county’s total output of 24,950 tons, accounting for 13.2% of total wheat output. In order to effectively control powdery mildew, we carried out the observation of the incidence of factors and comprehensive prevention and control.