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1992年夏秋大斑病在京郊玉米上突然暴发成灾,造成很大损失。为找到发病原因并为今后控制病害的发生提供依据,我们对大斑病的发生、危害进行了调查,现介绍如下。1 发生情况与危害京郊玉米栽培制度以麦后平播方式为主,1992年达230万亩,其中紧凑型品种占160万亩,平均亩产400公斤以上,紧凑型品种甚至超500公斤。大斑病已多年没有流行,这次突然暴发成灾,给生产造成较大损失,据
Summer and autumn big spot disease in 1992 suddenly outbreaks of maize on the outskirts of Beijing, causing great losses. In order to find out the cause of the disease and provide the basis for future control of disease occurrence, we investigated the occurrence and the hazard of the Great Spot Disease and are introduced as follows. 1 Occurrence and Harm The system of corn cultivation in the suburbs of Beijing is dominated by the post-wheat broadcast system. In 1992, it reached 230 million mu, of which 160 million mu were compact ones, with an average yield of 400 kg per mu and even more than 500 kg of compact varieties. Great spot disease has not been popular for many years, this sudden outbreak of disaster, resulting in greater loss of production, according to