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一、被害症状葡萄霜霉病是目前为害葡萄最严重的病害,我省各地均有发生,主要为害葡萄叶片、嫩梢及幼果等。叶片发病后在叶面上出现淡黄色小斑,斑点逐渐扩大变为黄绿色,叶背出现白色霜霉状物,而后叶片干枯,嫩梢发病后表现出水渍状病斑,渐变褐并出现白色霉状物,最后焦枯。果粒发病后变黑变褐,皱缩腐烂或硬化,失去商品价值。发病严重时造成全园叶片干枯脱落,不仅影响当年产量,而且还减少第二年的花芽形成。
First, the symptoms of the victims Grape downy mildew is currently the most serious damage to grape diseases, all over our province have occurred, the main damage to grape leaves, shoots and young fruit and so on. After the onset of the leaves appear yellowish spots on the foliage, the spots gradually expanded into a yellow-green, white back creamy mildew appears, and then the leaves dry, after the onset of tender shoots showed water stain-like lesions, gradually brown and white Moldy, finally scorched. After the onset of fruit black brown, wrinkled rot or harden, loss of commodity value. Severe illness caused by the whole plant leaves dry off, not only affect the current production, but also to reduce the second year of flower bud formation.