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小麦白粉病从基部第一张病叶蔓延到旗叶要经过24天,蔓延到穗部要经过34天。其蔓延的方式是按叶位顺序向上蔓延或跳跃式向上蔓延。若从发病中心向外蔓延,一个月时间可蔓延75.4—381米~2,1个发病单株,经过1个月的时间也可蔓延到16.6—26.4米~2。白粉病春季发展的过程分始发期、普发期、盛发期和终止期四个阶段;我省始发期为3月21日到4月5日,普发期从始发期到4月25日前后,盛发期从4月25日前后到5月15日前后,终止期一般在5月中旬以后。小麦种植密度越大,发病越重;白粉病发生的早晚和轻重决定于温度和雨量,与相对湿度关系不大。穗部感病后千粒重损失19.8—32.6％;旗叶感病后千粒重损失6.5—27.3％;中下部叶片感病后千粒重损失0.9—7.35％。
Wheat powdery mildew spread from the first leaf at the base to the flag leaf after 24 days, spread to the spike to go through 34 days. Its spread is spread upward by leaf order or leaps upward. If spread out from the center of disease, a month can spread 75.4-381 m ~ 2, a disease of single plant, after a month’s time can also be spread to 16.6-26.4 m ~ 2. The process of spring wheat powdery mildew is divided into four phases: the initial period, the general period, the full period and the termination period. The initial period is from March 21 to April 5 in our province. From the initial period to 4 Before and after the 25th of January, the Shengfa period will be from April 25 to May 15, with the termination period generally after mid-May. The greater the density of wheat planting, the heavier the incidence; the occurrence of powdery mildew sooner or later and the severity depends on temperature and rainfall, and the relative humidity has little to do. Thousand grain weight loss after panicle 19.8-32.6%; Thousand grain weight loss after the flag leaf disease 6.5-27.3%; Thousand grain weight loss in the middle and lower leaves after the disease 0.9-7.35%.