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请问甜瓜叶枯病和霜霉病的区别

2025-03-14 22:28:51

推荐回答（1个）

回答1：

甜瓜叶枯病分为真菌性瓜链格孢引起的叶枯，也叫甜瓜小斑病，甜瓜褐斑病。也有细菌性叶枯病，叶片上发病初期有圆形水渍状褪绿斑，逐渐扩大呈近圆形或多角形褐色斑，周围有褪绿晕圈，病叶背面不易见到菌脓，注意与细菌性角斑病的区别。主要通过种子带菌传播蔓延。而瓜链格孢引起的叶枯病，初期叶片上有褪绿色小黄点，后扩展为圆形至椭圆形褐色病斑，中央灰白色，后期中部有稀疏霉层。注意与甜瓜多主棒孢引起的靶斑病的区别。而甜瓜霜霉病，病斑受叶脉限制呈多角形，湿度大时，叶背面有灰紫色霉层。

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