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近年来,由于生产水平的不断提高以及适宜的气候条件,使小麦纹枯病在西峡县连年发生,并逐渐加重。特别是1991年严重田块病株率高达89%,引起严重的花秆烂茎,造成枯孕穗和白孕穗,严重田块自穗率达0.78%,已成为影响小麦高产稳产的重要病害.为此,我们在系统调查和大田普查的基础上,综合多种因素与往年进行分析比较分析,探讨流行特点及其原因,为开展防治提供依据。一、发生流行特点1991年小麦纹枯病在西峡为重发年份,其主要特点是:发病早、发展快、面积大、危害
In recent years, due to the continuous improvement of production level and suitable climatic conditions, wheat sheath blight occurred year after year in Xixia County, and gradually increased. Especially in 1991, the rate of serious field plots was as high as 89%, which caused severe rotten stalks of stems, resulting in the blight of booting and white booting. The self-spawning rate of severe field reached 0.78% and became an important disease affecting high and stable yield of wheat. Therefore, on the basis of systematic investigation and large-field census, we analyzed and compared various factors with previous years to discuss the characteristics and causes of the epidemic and provide the basis for prevention and treatment. First, the occurrence of epidemic characteristics Sharp eyespot in 1991 in Xixia for the re-issue of the year, its main features are: early onset, rapid development, area, harm