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在蔬菜大棚育苗时节,搞好育苗管理,防治蔬菜苗期病害是育壮苗、育好苗的重要技术措施之一猝倒病和立枯病是蔬菜苗期的重要病害,以瓜果类、茄果类蔬菜幼苗受害严重。猝倒病的症状是,种子出土前发病,造成烂种。发病幼苗茎部呈水渍状,后变为黄褐色,缢缩成为线状。病害发展很快,幼叶仍为绿色时,病苗即可猝倒。起初可见个别幼苗发病,几天后即能扩展蔓延,引起成片幼苗猝倒。在高温多湿条件下,死亡了的病苗表面及附近床土生有白色絮状霉层。立枯病症状是,病苗茎基部产生椭圆形暗褐色病斑。早期病苗白天萎缩,夜间恢复,病斑逐渐凹陷,
Nursery vegetables in the greenhouse season, do a good nursery management, prevention and control of vegetable seedling disease is strong seedlings, breeding seedlings one of the important technical measures Damp down and damping-off disease is an important vegetable seedling diseases, fruits and vegetables, Solanum vegetable seedlings suffer serious. Damp down disease symptoms, the disease erupted before the emergence of rotten species. Stem seedlings showed water-stained stems, after turning into brown, shrinking into a linear. Disease develops rapidly, young leaves are still green, the vaccine can be catapulted. Initially visible individual seedling disease, that can spread after a few days spread, causing catastrophe seedling cataplexy. In the hot and humid conditions, the surface of the dead and near the dead soil sick white swamp mold layer. The symptom of blight is that the stem base of the blight produces elliptical dark brown lesions. Early atrophy during daytime atrophy, night recovery, lesions gradually concave,