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近年来,小麦秆黑粉病在皖北麦区逐渐回升并已造成很大危害.1990年,我们在亳县油河乡对其发生危害情况及回升原因进行了调查研究.结果如下:(一)发生危害情况:1990年该乡秆黑粉病发生面积为14664亩,占该乡小麦种植总面积的72.3%;病田病株率最低为5.6%,最高为81.0%,平均为36.4%,所致产量损失平均达三成以上,全乡共损失小麦
In recent years, wheat stalk powdery mildew gradually rose in the northern part of Anhui Province and it has caused great harm.In 1990, we conducted a survey and study on the causes of the damage and the reasons for its recovery in Youhe Township, Bo County.The results are as follows: ) Occurrence of hazardous situation: In 1990, the area of stalk powdery mildew occurred was 14664 mu, accounting for 72.3% of the total area planted with wheat in the township. The disease strain rate was the lowest at 5.6% and the highest was 81.0% with an average of 36.4% As a result, the average yield loss hit 30% or more, and the township lost a total of wheat