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Symptoms and Control Methods of Cotton Boll Red Rot

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Symptoms After a cotton boll is infected, amorphous lesions initially appear. In wet weather or during continuous overcast and rainy periods, the disease spreads rapidly, covering the entire boll, and in some cases reaching the cotton fibers, producing a uniform pink or light red mold layer. After rain, the mold tends to stick together, forming pink clumps, causing the diseased boll to fail to crack open, and the cotton fibers to rot into stiff, matted locks. After seeds are infected, the germination rate declines. Pathogen The pathogen is the same as that of cotton seedling red rot. Transmission routes and disease conditions This fungus is a weak parasite and cannot directly infect cotton bolls; it mainly enters through wounds to cause disease

Symptoms After a cotton boll is infected, amorphous lesions initially appear. In wet weather or during continuous overcast and rainy periods, the disease spreads rapidly, covering the entire boll, and in some cases reaching the cotton fibers, producing a uniform pink or light red mold layer. After rain, the mold tends to stick together, forming pink clumps, causing the diseased boll to fail to crack open, and the cotton fibers to rot into stiff, matted locks. After seeds are infected, the germination rate declines.

Pathogen The pathogen is the same as that of cotton seedling red rot.

Transmission routes and disease conditions This fungus is a weak parasite and cannot directly infect cotton bolls; it mainly enters through wounds to cause disease. Lesions caused by cotton boll angular leaf spot, boll blight, boll anthracnose and other diseases can all induce red rot. Large numbers of conidia are produced on diseased bolls and spread by wind and rain, causing multiple secondary infections.

Control methods See cotton seedling red rot.

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