韭菜灰霉病是冬季冷棚韭菜的主要病害,每年冬前覆盖塑料薄膜后,即可陆续发生。发病初期叶面上生白色至浅灰褐色的小点,一般叶正面多于背面,斑点扩大后呈椭园形或梭形,在潮湿时,表面生出稀疏的霉层。发病后期,病斑互相融合成大片枯死斑,直到半叶或全叶枯焦。韭菜灰霉病在4—32℃的温度条件下均可发病,但以20—21℃最适宜。空气湿度越大发病愈重,适宜的发病湿度为95%以 Leek Botrytis chinensis is the main winter cold shed disease, covered with plastic film each winter before they occur one after another. The early onset of foliar white to light gray brown spots, the general leaves more than the back of the front surface, the enlarged spots were oval or fusiform, when wet, the surface sparse mold layer. Later in the disease, the lesion blends with each other into large patches of dead spots until the half-leaf or whole-leaf dead-focus. Leek Botrytis at 4-32 ℃ temperature conditions can be disease, but the most appropriate 20-21 ℃. The heavier the incidence of air heavier, the appropriate incidence of humidity is 95%