葡萄病害主要包括霜霉病、白腐病、炭疽病、黑痘病、白粉病、灰霉病、穗轴褐枯病、褐斑病、蔓枯病、根癌病、扇叶病毒病等,其中前四种病害是葡萄的主要病害,发生最为广泛,为害最为严重,被称为葡萄的“四大病害”。一、霜霉病(一)为害症状主要为害叶片,也为害新梢、叶柄、卷须、幼果、果梗及花序等幼嫩组织。1.叶片:叶片被害,初生细小、淡黄色、水渍状、边缘不清晰的小斑点,以后逐渐扩大为褐色不规则形或多角形病斑,数斑相连变成不规则形大斑。天气 The grape diseases include downy mildew, anthracnose, anthracnose, powdery mildew, gray mildew, cob rot, leaf spot, gummy stem, root disease, leaf virus disease, The first four diseases are the main diseases of grapes, the most widespread, the most serious damage, known as the grape “four diseases ”. First, downy mildew (A) damage to the main symptoms of damage leaves, but also harmful shoots, petioles, tendrils, young fruit, fruiting peduncle and inflorescence and other young organizations. 1 leaves: leaves were killed, small newborn, light yellow, water-like, the edge is not clear small spots, and later gradually expanded to brown irregular or polygonal lesions, several spots become irregular shaped spot. the weather