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Cotton ringworm disease occurs in Henan Province throughout the year, resulting in reduced quality and a 10% to 30% reduction in output. Therefore, comprehensive prevention and control of cotton rot tuber disease is an effective measure to improve cotton quality and increase profitability. 1 The characteristics of the occurrence of the disease of the rot bell (1) The epidemic disease. It is the most serious disease in China's cotton boll disease, accounting for more than 60% of the total number of bolls caused by boll disease. (2) 1 to 3 fruit branches in the lower part of the cotton plant were the most bells. (3) It is rainy in autumn, and the humidity in cotton fields is high, and there are more rotten bells. (4) Extensive management of cotton fields, mad long shadows, bad bells and more. 2 Reasons for the occurrence of rotten bells (1) Climate. In August and September, high temperature and high humidity, more rainfall, less sunshine, and high humidity in the field are conducive to the propagation of germs, seriously affecting the normal cracking of bolls, the accumulation of water in bells, the spread of pathogens, and the occurrence of boll disease. (2) Diseases. There are two major types of diseases that cause rotting bells: First, the bacteria can directly infect healthy and harmless cotton bolls, such as epidemic diseases, anthrax, and keratoses. Secondly, it only infects the damaged bolls and causes the occurrence of cotton boll diseases, such as red rot, pinkish pink, and soft rot. (3) Cultivation measures. Different planting methods have different degrees of occurrence of boll disease. Mulberry cotton is more serious than exposed cotton. Nursery and transplanting are heavier than summer cotton. Excessive use of nitrogen fertilizer, excessive density, and high fertilizer and water length in cotton fields, due to high humidity in the shade, Poor ventilation and light transmission are conducive to the propagation of germs, and the occurrence of bad bell disease is serious. (4) Insect pests. The wound is the main route of pathogen invasion, and the pest is heavy and the disease is heavy. According to Henan Province Academy of Agricultural Sciences, the incidence of boll inoculation with red rot is 95%, and the incidence of no injury inoculation is 16%. It can be seen that the damage caused by bolls is more likely to lead to the occurrence of botulism. 3 Comprehensive Prevention and Control Techniques for Bare Blast Disease 3.1 Selection of cotton fields, cotton varieties and planting methods. (1) Choose a cotton plot that is flat on the terrain and convenient for irrigation and drainage. The continuous cropping time of cotton fields should not be too long. Generally, 3 to 4 years after cotton planting, other crops should be planted. (2) The varieties of cotton should be selected to be loose, light and light. (3) Planting methods. Transplanting seedlings and mulching film can make the growth period ahead of time, early maturity and high yield, but there are more rotten bells, and the prevention and treatment of rotten bells in cotton fields should be strengthened. The cotton-cotton intercropping cotton field is more economical than the single-crop cotton field, and the rotten bell is also lighter. At present, most of the Yellow River basin use this planting method. 3.2 Strengthen cotton field management. (1) To early buds. For the middle and upper fertility cotton fields, the early buds on the lower one or three fruit branches have a significant effect on the growth and development, yield and quality of the cotton plants, and the reduction of rotten bells. (2) Chemical control. Promptly apply plant growth regulators to prosperous cotton fields, such as auxiliaries and shrinkage, to control plant height and prosperous growth, and to create ideal plant types for ventilation and light transmission to reduce the number of rotten bells. (3) timely pruning, topping. In the initial stage of the disease, timely pruning, emptying the branches and picking the heart to the lower part of the old leaves, improve the ventilation and light conditions of the cotton fields, reduce the humidity, and reduce the bad bell. In rainy years, it can be conducted every 3~5 days. (4) Grab sick bells and old bells. In the early stage of the occurrence of the rotten bell, the old bells and sick bells in the lower part of the cotton plant were promptly picked and picked. Peeling and drying can not only reduce the loss of production, but also reduce the re-infection of pathogens. At the same time, remove dead branches, rotten leaves, and rotten bells to reduce the spread of pests and diseases. (5) Strengthen fertilizer and water management in cotton fields. When it rains, it is necessary to promptly rule out the accumulation of water in the fields. When drought occurs, irrigation should be conducted with furrow irrigation. Topdressing nitrogen fertilizer is best to add fulvic acid compound fertilizer, especially topdressing potassium fertilizer, can increase the disease resistance of cotton plants, prevent premature aging and increase yield. (6) Pest control. Take effective measures to prevent and control bollworm pests, such as bollworm and red bollworm, to reduce wounds, avoid infection by pathogens, and reduce the occurrence of bell disease. 3.3 Chemical control. (1) Sodium hydrosulfite is sprayed at the beginning of flowering stage. The dosage is 60-75g per hectare, and 600-750kg of water is added. Spraying once every 10 to 14 days can effectively reduce the number of rotten bells, increase the number of bolls and increase the yield. (2) spray fungicide. Select 75% chlorothalonil WP 600 times or 500% 50% carbendazim WP 500 times, 900kg per hectare liquid, aligned in the middle and lower parts of cotton plants evenly spray, the control effect of up to 85%.