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植物病害日益猖獗,迫使人们考虑病害防治中的问题。一方面在常见重大病害的防治上,已有防治措施不能满足生产要求,疫区在扩大,突出的病例就是棉花的黄枯萎病。另一方面,随着农业措施的改进、产量的提高,有些(?)有次要病害上升为主要病害,例如水稻纹枯病发病面积高达一亿亩,上升为水稻的主要病害;小麦的纹枯病和根
Increasingly rampant plant diseases, forcing people to consider the problems in disease prevention and control. On the one hand, in the prevention and control of common major diseases, there are already prevention and control measures that can not meet the production requirements and the epidemic areas are expanding. Outstanding cases are the yellow blight of cotton. On the other hand, with the improvement of agricultural measures and the increase of output, some secondary diseases have risen as the main diseases, for example, the area affected by rice sheath blight reached as high as 100 million mu and rose to the main disease of rice. The wheat grain Blight and root