枇杷污叶病是一种较普遍的枇杷病害。它与蚧类、蚜虫等引发的煤烟病，虽然都是黑褐色的霉状物，但是，污叶病多发生在叶背，而煤烟病在叶面、叶脊及枝梢上都有发生。污叶病发病初，叶上呈圆形或不规则形的黑褐色斑点，.
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