Cotton boll red rot
Symptoms of cotton boll infected with the initial amorphous disease spot, in wet weather or continuous rain, the disease spread rapidly, throughout the whole boll, some spread to the cotton fiber, producing a uniform pink or light red mildew layer, easy to stick together after rain, become a pink lump, resulting in the disease boll can not crack, cotton fiber rot into a rigid petal, seed infection, the germination rate decreased.
The pathogen is the same as cotton seedling red rot.
The transmission route and disease conditions are weak parasitic bacteria, which can not directly infect cotton boll, but mainly caused by wound invasion. Cotton boll corner spot, boll blight, boll anthracnose and other disease spots can induce red rot. A large number of conidia on the diseased bolls were transmitted through wind and rain and re-infected many times.
For control methods, see red rot of cotton seedlings.
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Cotton boll aspergillosis
Symptoms occurred in all cotton areas. It mainly harms cotton bolls. At first, water-immersed yellow-brown spots are produced at the cracks, wormholes, wounds or cracks of cotton bolls, and then yellowish-green or yellow-brown powders are produced, which fill the cracks of cotton bolls, resulting in abnormal cracking of cotton bolls and yellowish-green villous mildew, that is, conidiophores and conidia of pathogens, and the quality of cotton wool is polluted or dry-rot deteriorated to varying degrees. Pathogen AspergillusflavusLink is called Aspergillus flavus and Aspergillu.
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Stem blight of cotton
The symptoms were more serious in the northeast cotton area, the Yellow River basin, the Yangtze River basin, along the river and coastal cotton areas. The disease occurred in the whole growth period of cotton, and the damage was serious in seedling stage and bud stage. Cotyledons and true leaves were infected with purplish red at the primary edge and small gray round spots in the middle, and the later spots expanded or fused into irregular spots. Some concentric wheel lines appear in the center of the disease spot, on which there are small black dots, that is, the conidium of the pathogen. The diseased part is often broken and scattered, and when the humidity is high, the young leaves appear water-immersed disease spots, and then expand as quickly as boiling water.
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