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葡萄房枯病是近年来葡萄生产中发生较重的病害,此病主要危害果实、果梗和穗轴,发生严重时也为害叶片,果实着色后发病多,对生产造成损失较大。1.发病症状病初在小果梗基部出现褐色不规则病斑,边缘有不明显深褐色晕圈,渐扩大,环切果梗,引起果粒失水萎蔫,后期渐渐干缩,变成紫黑色的僵果,并在病果表面产生稀疏的小黑点,即病菌的分生抱子器,僵果悬于枝上很久不落。叶片感病时,在叶片上产生圆形黑褐色小斑点,中部变成灰白色,其上密生小黑点。2.发病条件葡萄房枯病是一种真菌病害,病菌以分生抱子器或子囊壳在病果、病穗轴、病叶等病残体上越冬。病菌适宜温限9～40℃,15～35℃都能发病。此外该病是一种高温高湿病害,菌丝生
Grapevine leaf blight is a serious disease occurred in grapes production in recent years. The disease mainly affects fruits, fruit stems and cob, but also damages the leaves when it is serious. After fruit coloring, it has many diseases and causes great loss to the production. 1. Symptoms of sick early in the small fruit stem base at the base of brown irregular lesions, the edge of the obvious dark brown halo, gradually expanding, ring cut stems, causing fruit wilting dehydration, the latter gradually shrink, become purple Black stiff fruit, and produce sparse black spots on the surface of diseased fruit, that is, the sub-strains of germs, stiff fruit hanging in the branches for a long time do not fall. When the leaves are susceptible, round dark brown spots are formed on the leaves, and the middle part becomes gray-white with small black spots on the leaves. 2. Disease conditions Grapevine leaf blight is a fungal disease, the pathogen to stratum fruiting bodies or ascus in disease and disease, disease cob, sick leaves and other sick and winter over. Pathogenic bacteria suitable temperature limit 9 ~ 40 ℃, 15 ~ 35 ℃ can attack. In addition the disease is a high temperature and humidity disease, hyphae