为了促进草莓提早成熟,我省近一、二年内保护地栽培——温室、大棚日益增加。但由于保护地上特殊的小气候,造成草莓受多种病害侵染,现将草莓芽枯病的发生及防治介绍给大家: 症状:表现为花苞和新叶急剧萎蔫,呈黑色枯死,叶柄茎部、托叶被侵染,展开的成叶也萎蔫。 病原及发病条件:经分离鉴定,该菌为立枯丝核菌(Rhizoctonia Salani K(?)hu),菌丝初为白色,后渐变褐色,在分枝处略缢缩,离此不远处形成隔膜。菌核从菌丝发出,菌核大小不一,但可互联成壳状,内外颜色一致。菌核萌发适温为15℃,高温有利于菌丝生长,菌核在50℃时5分钟即死亡。该菌寄生性不强,呈半腐生状态,寄生范围广,但国内尚未有寄生草莓的报导。在大棚高湿(空气相对湿度80％以上),气温在10℃以上,氮素高、茎叶 In order to promote the early maturing of strawberries, our province nearly a year or two years of protected cultivation - greenhouses, greenhouses increasing. However, due to the protection of a special microclimate on the ground, causing strawberries infected by a variety of diseases, the occurrence of strawberry blight and prevention are introduced to you: Symptoms: the performance of bud and new leaves sharp wilt, black dead, stems, Stipules are infected, unfolded into the leaves also wilted. Pathogen and disease conditions: The isolate was identified as Rhizoctonia Salani K (?) Hu. The mycelium was white at first, gradually brownish, slightly constricted at the branch, not far from A membrane is formed. Sclerotium issued from the mycelium, sclerotioron size, but can be interconnected into a shell-like, internal and external color. The optimum temperature for sclerotinia germination is 15 ℃. The high temperature is conducive to mycelial growth, and the sclerotia die at 5 ℃ for 5 minutes. Parasitism of the bacteria is not strong, was half-saprophytic state, a wide range of parasites, but no reports of parasitic strawberries in China. High humidity in the greenhouse (air relative humidity above 80%), temperature above 10 ℃, high nitrogen, stems and leaves