As cotton enters the looping season, it often occurs with rotten bolls. The average rotten boll rate is 10% to 15%, and severe plots are more than 30%. This often results in a decrease in cotton yield and quality. Therefore, the following measures should be taken to prevent rotten bolls: It is mainly to control cotton bollworm and red bollworm. The bollworm may be populated with poplar branches or sex attractants and controlled with Huifeng killing enemy or fast killing spray during the hatching period of eggs; the red bollworm can be forecasted to be smoked with dichlorvos during the adult emergence period. Kill and use inoculation of innocuous EC and other agents during the egg hatching period. Wet moisture protection. Four ditch in the cotton field is not smooth, and the humidity in the field is high, resulting in more rotten bells. Therefore, we must clean up the ditch in time so that the ditch can communicate and eliminate waterlogging. For the lower-lying cotton fields, the depth of the four ditch should be deepened to lower the groundwater level. Air and light protection against rotting. First of all, we must strictly control the amount of nitrogen fertilizer, nitrogen fertilizer is too much, easy to cause cotton plants crazy growth, the amount is too small, it can not effectively promote the growth of cotton plants and improve the ventilation and light transmission conditions. Secondly, we must do a good job of chemical regulation. According to the growth of cotton seedlings, timely and appropriate application of shrinkage security can effectively control the elongation of the upper fruit branches and the growth of axillary buds, which is conducive to ventilation and light transmission. In addition, timely and appropriate to hit empty branches, old leaves, you can directly improve the ventilation and light conditions in the lower part of the cotton plant, reduce the middle and lower rotten boll. Treatment against rottenness. In the flowering and bolling stage, mu with 2.5% carbendazim 600 times solution or 50% thiophanate 1000 times spray can effectively prevent boll diseases, directly kill pathogens, and reduce rotting. Pick and pick rotten. For rotten bolls that have already occurred or are about to occur, they must be grabbed promptly in order to take the bolls with germs out of the field and reduce pathogens. At the same time, peeling, drying, and harvesting the rotten bells in time can reduce the output loss of rotten bells and increase the income within the flowers.
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