Cotton leaf spot disease is a kind of bacterial disease. It is produced in various cotton areas. Benefiting cotton plants cause budding, falling flowers, falling bells, fallen leaves, and rotten bells.
Symptom identification: This same important damage to the leaves can also infect the bells and stalks. After the cotyledons have benefited, the diseased part develops water-stained black spots, which turn into black-brown in the early stages. When the true leaves develop, dark green dots appear on the opposite side of the leaves and then extend into water-stained shapes, due to the veins of tissues. Limits, lesions were polygonal. Sometimes the lesions grow along the veins and become dark brown stupid strips. Qingling benefited. At the beginning, dark green needles were spotted, which in turn expanded into water-stained round lesions that turned reddish-brown in the early stages, shortening the subsidence and causing black-brown rotten spots to begin. After stalks have benefited, they often become black and dry.
Discipline
The pathogens overwinter on the seeds and the sick and become the source of infection in the coming year. The level of cottonseed strains is a decisive factor in the severity of disease at the seedling stage. Temperature and humidity are closely related to the disease. The moderate temperature and raininess are the main preconditions for the disease. When the soil temperature is between 10°C and 15°C, it is usually the same as no disease. At the time of 16-20°C, the disease begins to develop, and the disease occurs at the temperature of 24-28°C. Heavy, above 30°C, the disease is aggravated. When the humidity is above 85%, the disease grows fastest. The more thunderstorms from early June to early August, the more severe the disease.
Prevention measures
1, choose the type of disease resistance.
2, drying 2-4 days, can significantly reduce the carrier rate of keratoses.
3, seed disposal.
4, the combination of seedlings Dingmiao, eradication of diseased seedlings, brought out of the field concentrated burned. 5, according to the weather forecast, the monks sprayed with 1:1:200 Bordeaux mixture for 1-2 times before the rain, which can effectively inhibit the expansion of pathogens; or use 65% zein zinc WP 500 times spray, spray per acre Liquid 60 kg.
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