韭菜灰霉病又称白色斑点病,是冬春棚室韭菜的主要病害,栽培管理稍有不当,极易发病,轻者减产20～30％,重则减产50％以上,而且病叶伴有霉味,商品性受到严重影响。因此,在冬春棚室韭菜栽培过程中,要强化管理措施,谨防灰霉病的发生。 一、发病症状 韭菜发病后,先在顶部叶面产生浅灰褐色或白色小斑点,由叶尖逐步向下发展, Leek botrytis, also known as white spot disease, is the main disease in winter and spring shed leeks, cultivation and management of a little improper, extremely easy to disease, the light reduction of 20 to 30%, weight reduction of more than 50%, and the diseased leaves with Musty, the product is seriously affected. Therefore, in the winter and spring leek cultivation studio, to strengthen management measures to guard against the occurrence of gray mold. First, the incidence of symptoms Leek disease, first in the top leaves produce light grayish brown or white spots, gradually from the tip down development,