First, the conditions and causes of the occurrence of cotton rotten bell: cotton rotten bell is caused by a variety of bacteria infected cotton bolls. In the summer and fall and rainy seasons, the humidity in the cotton fields is relatively large. If the shelter is heavy and the ventilation and light transmission are poor, the cotton rotten bells are also more serious. Diseases of bolls mainly include diseases such as anthrax, anthrax, angular spot disease, red rot, pinkish pink disease, and black fruit disease, among which diseases are the main diseases that cause rotten bells. Extensive management of cotton fields, pruning and control measures are not timely, plant prosperous, etc., are conducive to disease.
Second, cotton rotten bell control measures: 1, a reasonable fertilization. Increase the application of organic fertilizers and phosphorus and potassium fertilizers, the appropriate amount of nitrogen fertilizer, to prevent the growth of cotton plants, reduce the cotton cover, improve ventilation and light transmission. 2, timely drainage. For the low-lying, poorly drained and heavily-paved cotton fields, drains should be deepened in order to speed up drainage. Improve cotton growth and environmental conditions. 3, moderate control. In cotton fields with good fertilizer and water conditions, the cotton plants are prone to growth and should be sprayed with dilute amines in the early and middle stages of cotton growth to regulate the growth of cotton, prevent the cotton plants from growing in length, and reduce the damage caused by the bollworm disease. 4, adjust the bell. There are too many prunes of mulch cotton or early-onset cotton. By adopting effective measures to adjust the cotton's ringing period and the site of the bell, the number of rotten bells can be reduced. Early-onset cotton promotes the removal of early buds from the lower 1–4 fruit branches, or early removal of the first and second fruit branches. 5, reasonable pruning. For cotton fields with narrow row spacing and earlier lines, in order to reduce excessive dew coverage in the cotton fields and improve the light conditions and ventilation conditions in the middle and lower parts, the side of the heart should be beaten as soon as possible, which can reduce the shedding of bells and the rotten bell. 6, cultivating loose soil. Rows of cultivating loose soil can eliminate the ground panel knots and reduce the humidity of the cotton fields, which is of great benefit in reducing cotton rotten bells. 7, picking sun disease bell. For bolls longer than 40 days, bolls that have faded and yellowed and began to show dark spots have been harvested before being rotted. The bolls collected were soaked in a 1% ethephon solution and then dried, and the bolls could be obtained. Good cotton. 8, Intercropping. Reasonable intercropping has obvious disease-preventing effects on cotton boll diseases. Wheat-cotton, cotton-vegetable, and cotton-guarantee must be used to prevent diseases. 9, pharmaceutical control. Chemical control is an important measure for comprehensive prevention and control of cotton rotten bells, and targeted bactericides must be sprayed. From August to September, when the weather forecast has a few days of rainy weather, spraying protection should be carried out in time. Spraying should be concentrated in the lower part of the cotton plant. The commonly used agents are carbendazim 1000 times, 58% metalaxyl MnZn wettable powder 600 to 800 times, 80% spray WP WP 500 to 600 times, 70% chlorothalonil WP 500 times Wait.
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