There are many reasons for "black spots on cotton leaves". For example, the following diseases and pests can cause black spots on cotton leaves:
1. Cotton seedlings damaged when the cotyledons of cotton seedlings are dehusked. The cotyledons of the diseased seedlings stick together and there is a layer of dark brown mold on the damaged part of the crust. Cotyledons or true leaves after the extension of the victim, began to purple or brown on the back of the depression of the small spots, mostly in the cotton seedlings after injury, after the expansion with or without obvious concentric ring pattern, when the weather is wet, the lesions have obvious black Mold layer.
2. Damage caused by cotton blind lice: The end buds in the leaf stage cause the dead leaves to die and become headless. The top buds in the 3 to 6 leaf stages suffer heavy damage, which triggers the sprouting of adventitious buds, branches, and becomes a long seedling. New leaves first appear black spots.
3, cotton anthracnose disease victim leaves, in the edge of the leaf produce a semi-circle brown lesions, deep red edge, when serious, dead leaves. Stems were reddish-brown to dark black or oblong.
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