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棉花苗期病害,在关中棉区每年都有不同程度的发生,1951、53、57、59、63、64年曾大流行,形成毁灭性灾害。1957年关中棉区因茎枯病大流行,翻种棉田一百多万亩。1963年全省有二百多万亩棉田发生不同程度死苗,其中有一百零五万亩棉田死苗达百分之五十以上。因此,加强棉花苗期病害的预测预报,对棉花全苗有重要意义。棉花苗期病害的预测预报,我省曾提出过一个试行办法,即“在三天内,气温低于10℃,或有连续阴雨时,棉苗叶部发病率达到5％以上和根病发病率达10％以上应立即发出预报,采取防治措施。根据棉花苗期病
Cotton seedling diseases, which occur to varying degrees every year in the Guanzhong cotton area, suffered a devastating disaster in 1951, 53, 57, 59, 63 and 64 years. 1957 Guanzhong cotton blight due to a pandemic, turned over more than one million mu of cotton. In 1963 there were more than 2 million mu of cotton seedlings in the province with varying degrees of dead seedlings, of which 1.05 million mu dead in cotton fields reached more than 50%. Therefore, to strengthen the prediction of cotton seedling diseases, cotton seedlings have important significance. Cotton seedling disease prediction and forecasting, the province has proposed a pilot approach that "within three days, the temperature is below 10 ℃, or a continuous rainy season, the incidence of cotton seedling leaf Ministry reached more than 5% and the incidence of root disease More than 10% should immediately send a forecast to take control measures. According to cotton seedling disease