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葡萄霜霉病是葡萄上常发病害,在生产过程中常被视为次要病害,往往防治因措施不得力,造成很大损失,影响树势及产量。因此,防治霜霉病的工作不容忽视。 一、症状 叶片发病初期,呈现细小的不定形的淡黄色水渍状斑点,以后逐渐扩大,在叶片的正面出现黄色或
Grape downy mildew is a common disease on grapes, often regarded as a secondary disease in the production process, often due to ineffective measures, resulting in great losses, affecting the tree vigor and yield. Therefore, prevention and cure of downy mildew can not be ignored. First, the symptoms Early onset of leaves, showing a small amorphous yellowish water-like spots, and then gradually expanded in the leaves of the positive yellow or