摘要
１９９１年以来，随着玉米高产品种掖单１３号的大面积推广，宁夏灌区普遍发生玉米霜霉病。经鉴定引起此病的病原菌为大孢指疫霉玉蜀黍复种［Ｓｃｌｅｒｏｐｈｔｈｏｒａｍａｃｒｏｓｐｏｒａ（Ｓａｃｃａｒｄｏ）Ｔｈｉｒｕｍａｌａｃｈａｔ，ｓｈｏｗ＆ＮａｒａｓｉｍｓｈａｎｖａｒｍａｙｄｉｓＬｉｕ＆ｚｈａｎｇ］。种子带菌传病是本区此病发生的主要原因；土壤接种试验和大面积多点病情调查结果表明，土壤中卵孢子传病作用不明显。田间病情与玉米品种关系密切．掖单系列品种病害严重．中丹２号和单玉１３号基本上不发病。在品种相同的情况下，地势低洼．排水不良的玉米田，发病严重。
Outbreak of maize downy mildew is occuring in the lrrigation Area of Ningxia with popularization of the high-yield cultivar of corn, Yidan No.13,in a big area since1991. The pathogen of the disease has been identified to be Sclerophthora macrospora(Saccardo) Thirumalachar,Show & Narasimshan var.maydis Liu & Zhang. Sown fungsbearing seed is the main causeal factor of the disease.The results of soil inoculation test and investigation of disease state in a broad area and many places showed that the communicability of oospore in soil for the disease isn't clear.The relationship between susceptibility of corn cultivar and degree of disease was significant.The disease in Yidan seres cultivars was serious, and the cultivars of corn,Zhogdan N0.2 and Danyu NO0 13 were not invasion.The disease development in lowlying and humid land was more serious than in other's of same cultivar corn.
出处
《宁夏农学院学报》
1996年第2期1-6,共6页
Journal of Ningxia Agricultural College
关键词
玉米
霜霉病
侵染来源
发病因素
maize downy mildew source of infection factors of disease
