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近年来,由于耕作制度的改变,小麦套种玉米的面积不断扩大,宁夏灌区小麦赤霉病发生普遍,且逐年加重,使小麦产量和品质受到严重影响。为了探索小麦赤霉病对产量损失的程度,为测报和制定防治指标提供依据,作者于1989年对本区当前小麦主要栽培品种永良4号赤霉病损失率进行了研究。研究方法小麦赤霉病的病情分级:分为5级,0级为健穗;1级为感病小穗占全穗的1/4以下;2级感病小穗占全穗的1/4～1/2以下;3级感病小穗占全穗的1/2～3/4;4级感病小穗占全穗的3/4以上。
In recent years, due to the change of cultivation system, the area of wheat intercropping maize has been expanding continuously. The occurrence of wheat scab in Ningxia irrigation area is widespread and increased year by year, which seriously affects the yield and quality of wheat. In order to explore the degree of yield loss of wheat scab, and to provide the basis for measuring and setting control indexes, the author studied the rate of scab in Yongliang 4, a major wheat cultivar in this area in 1989. Research methods The disease grading of wheat scab is divided into five grades, the grade 0 is the healthy spike; the grade 1 is the susceptible spike which occupies less than 1/4 of the whole spike; the grade 2 susceptible spikelet occupies 1/4 ~ 1/2 or less; Grade 3 spikelets accounted for 1/2 ~ 3/4 of panicles; Grade 4 panicle spikes accounted for more than 3/4 of panicles.