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问:柑橘发生白粉病怎么办?答:柑橘白粉病发病症状在嫩叶正、反两面呈现白色霉斑,大多近圆形,外观疏松,霉斑常由中心向外扩散。霉层下面叶片组织最初呈水渍状,以后逐渐失绿,形成黄斑。严重时病斑扩及全叶,使较嫩的叶片枯萎,较老的叶片扭曲畸形。在春梢抽发芽期或在发病
Q: Citrus powdery mildew occurs how to do? A: The symptoms of citrus powdery mildew in the positive and negative symptoms appear white mildew, mostly round, loose appearance, mildew often spread out from the center. Under the mold layer, the leaf tissue was initially water-stain, then gradually lost its green color to form the macula. Severe lesions spread to the whole leaf, the tender leaves withered, the older leaves distortion. In spring shoot pumping germination or disease