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1986年以来,我县后高庙村小麦根腐病连续3年大面积严重发生。表现为返青期开始根鞘腐烂,茎基部变褐,叶片自基部开始变黄,分蘖枯死,成穗少,早枯形成“白穗”,籽粒秕瘦。轻者减产20-30％,重者绝产。我们在防治实践中发现,不同的轮作方式小麦根腐病发病程度不同,以小麦与棉花或西瓜轮作防治效果明显。现将情况介绍如下: 1.自1986年开始,连续3年为小麦、玉米连作,小麦根腐病逐年加重。1989年5月中旬病株率达85％。麦收时测产,亩产仅161.9千克,千粒重为26.3克。 2.1986年为小麦、玉米连作,1987年春于麦田内套种棉花,当年留春茬,1988年种植春
Since 1986, the root rot of wheat in Hougaomiao Village in our county has been seriously damaged for three consecutive years. The results showed that the roots and sheath rots, the base of the stems brown, the leaves began to turn yellow from the base, the tillers were dead, the number of ear became less, the number of ear became lower and the number of ear became thinner. Light reduction of 20-30%, severe cases of abortion. We found in practice prevention and control, different rotations of wheat root rot disease of different degrees, wheat and cotton or watermelon rotation for control effect is obvious. Now the situation is as follows: 1. Since 1986, for three consecutive years of wheat, corn continuous cropping, wheat root rot year by year increased. In mid-May 1989, the rate of diseased plants reached 85%. Measured when the wheat harvest, only 161.9 kg per mu, grain weight of 26.3 grams. 2. 1986 for wheat and corn even cropping, the spring of 1987 intercropping cotton in the wheat field, when the spring leaves, 1988 planting spring