Eight methods of preventing Cotton from rotten Boll

1. Ditching and drainage cotton is most afraid of autumn waterlogging, the greater the humidity of the cotton field, the more serious the rotten bolls. In case of continuous rain, it is more likely to cause rotten bell. Therefore, after the heavy rain, it is necessary to timely eliminate the stagnant water in the cotton field, dry the moisture to reduce the humidity, improve the field microclimate, accelerate the cotton boll cracking, restrain the propagation and spread of the pathogen, and reduce the rotten boll.

two。 In the cotton field with high pruning density and vigorous growth, the empty fruit branches should be cut off in time, the strong buds should be erased, the middle and lower side tops and the old leaves of the main stem should be removed in stages and batches, the ventilation and light penetration should be enhanced, the temperature should be lowered, and the rotten bolls should be reduced.

3. Strong winds and torrential rains often cause cotton plant lodging and serious boll rot. Timely cultivation of soil before wind and rain can significantly enhance the fixing and supporting capacity of the aboveground part, which is conducive to wind resistance and toppling prevention. Soil cultivation can not only increase soil temperature, promote root growth, but also facilitate drainage after rain, reduce field humidity and promote root growth.

4. Pushing plants and ridges to greedy green late-maturing and shady cotton fields, cotton plants can be pushed by hand on sunny days to form a ventilation passage between rows, and then two rows of cotton plants will be pushed away a week later, so that the continuous alternating push can improve ventilation and light transmission conditions, promote precocious maturity and prevent rotten bolls.

5. The period of flowering and boll formation of cotton for disease prevention and control is the peak period of various insect pests. Cotton boll rot is mostly caused by insect invasion, so it is necessary to control pests in time, reduce the harm of borer pests and ensure the normal development of cotton bolls.

6. Spray protection Zhang from August to September, under the climatic conditions of high temperature and high humidity, 0.1% of the plants in cotton fields began spraying protection when their bolls rotted. Generally, you can use 1 ∶ 1 ∶ 200 Bordeaux solution, 50% carbendazim wettable powder 800x liquid or 40% aluminum ethyl phosphate wettable powder 500x solution, spray 1 ~ 2 times. The liquid should be sprayed on the bolls in the middle and lower parts of the cotton plant, requiring meticulous, uniform and thoughtful spraying.

7. Foliar fertilizer spraying should be carried out from late August to the first and middle of September. For those with strong growth and signs of rotten bell, 2% superphosphate leaching solution can be sprayed with 1% 2% potassium chloride aqueous solution, or 0.3% potassium dihydrogen phosphate solution. If there is a phenomenon of de-fertilizing, 0.75-1kg urea can be added to the 50 kg phosphorus and potassium fertilizer solution. Generally spray twice, can be combined with the prevention and control of diseases and insect pests.

8. Grabbing rotten bolls usually starts with the shell of bolls, then gradually extends to cottonseeds, forming stiff cotton, and finally makes the bolls rot. Therefore, it is necessary to timely pick the old peach, diseased peach, worm-eaten peach and yellow-shell peach in the middle and lower part of the cotton plant and peel it out of the cotton field to reduce the loss and destroy the cotton shell at the same time to reduce the spread of the disease.