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油菜是合肥市郊区的主要油料作物,当家品种是白菜型黄鳝籽,常年亩产油菜籽150斤左右,产量偏低。油菜产量不高的原因很多,霜霉病的连年为害也是造成油菜低产的重要原因之一。为了有效地防治此病,我们进行了比较系统的调查研究。油菜霜霉病是油菜全生育期中都能发生的一种病害。在苗期,叶片感病后,出现淡黄色不规则病斑,条件适宜时,病斑扩展很快,叶片逐渐变黄,枯萎脱落。叶片感病先
Rape is the main oil crop in the suburbs of Hefei, when the species is cabbage-type eel seed, perennial annual output of about 150 pounds of rapeseed, the yield is low. Rape yield is not high for many reasons, downy mildew damage caused by one of the important reasons for low yield of rapeseed. In order to effectively prevent the disease, we conducted a more systematic investigation. Rapey mildew is a disease that can occur during the whole growth period of rape. At the seedling stage, after the leaves became susceptible, light yellow irregular spots appeared. When the conditions were right, the spots expanded rapidly, the leaves turned yellow, withered off. Sick leaves first