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小麦纹枯病(Rhizoctonias olani kiihn)近年来在我县发生和危害日趋严重。1986年发病较普遍,但为害较轻,病株率为5～8％,未出现白穗,1987年全县小麦发病面积达12.6万亩,占种植面积的100％,为害程度重,病株率为8～25％,最高达75.85％;病情指数为3.0～15.0,最高达37.54;其中自穗率达1.0～15％,占种植面积的5％;受害田块一般减产1～2成,严重的减产一半以上。纹枯病的为害超过了赤霉病,成为小麦生产上的主要病害之一。现就1987年小麦纹枯病大发生原因及防治意见探讨如下。
Rhizoctonia olani kiihn has become more and more serious in our county in recent years. In 1986 the incidence was more common, but less harmful, the diseased plant rate was 5 ~ 8%, did not appear white spike, 1987 county incidence of wheat reached 126,000 mu, accounting for 100% of the acreage, the degree of damage, The rates ranged from 8% to 25%, up to 75.85%. The disease index ranged from 3.0 to 15.0 and reached 37.54, of which, the self-spawning rate reached 1.0-15%, accounting for 5% of the acreage. Serious cut more than half. Sheath blight damage than scab, become one of the major diseases in wheat production. The 1987 wheat sheath blight causes and prevention and treatment of the following discussion.