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六、葡萄白粉病葡萄白粉病主要为害葡萄,此病在山东、辽宁、吉林、河北、河南、江苏等地都有发生,近几年来葡萄白粉病在济南地区有所发展。(一)、症状:此病菌能侵害葡萄所有的绿色部分,如叶片、新梢、果实等。叶片被害时,开始在叶表面长出淡白色病斑,后生面粉状的徽(分生孢子)。并在其上散生小黑粒点(闭囊壳)。同时叶表呈灰褐色花纹,严重时叶焦枯;果实受害后长出一层白粉,擦去白粉,表皮上有褐色花纹,以后果皮变褐色,果实停止生长,有时变畸形;在多雨时,病粒易破裂而后腐烂;穗轴和果梗受害时,发脆易断。新梢受害初期表面也长白粉,后期形成一块块褐斑,使枝蔓不能很好成熟。
Six, grape powdery mildew Grape powdery mildew is the main damage grape, the disease occurs in Shandong, Liaoning, Jilin, Hebei, Henan, Jiangsu and other places, grape powdery mildew in Jinan in recent years has been some development. (A), Symptoms: The bacteria can damage all the green parts of the grape, such as leaves, shoots, fruits and so on. When the leaves were killed, pale white lesions began to develop on the surface of the leaves and the floury emblem (conidia) developed. And scattered on its black particles (closed capsule shell). At the same time leaves table was gray brown pattern, severe leaves scorched; fruit victims grow a layer of white powder, wipe the white powder, brown skin pattern, after the peel brown, the fruit stops growing, sometimes deformity; in the rainy days, the disease Granules easily rupture and decay; cob and fruit stem damage, the hair fragile. Shoot damage the initial white powder surface, the late formation of a piece of brown spots, so that the branch can not mature well.