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玉米纹枯病在我市始见于70年代末,近几年已上升为玉米的主要病害.我站从1979年开始,对其发生规律、影响因素进行了观察,对产量损失进行了测定,并对综合防治技术作了试验与探讨.(一)病害消长情况我市玉米一般在3月底4月初播种,4月中下旬移栽,7月底8月初收获.据1983、1985、1992年系统观察,玉米纹枯病从苗期至穗期均可发生,危害叶鞘、叶片和穗部,由下而上逐步发展,受害植株籽粒灌浆不足,批粒增多,粒重明显下降.纹枯病始见于6月上中旬,盛发期在6月下旬至7月上旬,危害高
Corn sheath blight was found in our city in the late 1970s, and has risen to the major diseases of maize in recent years. Starting from 1979, I observed its regularity and influencing factors and measured the yield loss. (A) disease growth and decline of the city corn is generally planted in early March early April, mid-late transplanted in late July early August harvest According to 1983,1985,1992 systematic observation, Sheath sheath blight can occur from the seedling stage to the ear stage, endangering the leaf sheath, leaves and ear, gradually developing from bottom to top, the impacted plants lack of grain filling, grain number increased, grain weight decreased significantly. Mid-month, Shengfa period from late June to early July, high risk