In the rainy season of the cotton area, there are often different levels of locust disasters. After the cotton is subjected to sputum, the cotton swells and succumbs to death. The buds, flowers and bells fall off a lot, and the main component of the yield is almost lost. Effective remedies should be taken for this.
1, Fu Miao loose soil. Immediately after the flooded cotton field is drained, the fallen cotton plant is straightened and the soil is stabilized, so that the plant grows upright, the ventilation and light transmission conditions of the cotton field are improved, and the loss caused by the lodging is reduced. After the cotton field is slightly dried, the loose soil will be broken in time to improve the soil ventilation and promote the normal physiological function of the root system.
2, late to fight top. After the cotton is subjected to sputum, through the remedial measures, its growth stamina is relatively large, and the time for topping the heart can be postponed for about 7 days to facilitate the autumn peach.
3, more competition for autumn peach. After the cotton is affected, the growth period is obviously delayed. It is necessary to carry out foliar fertilization in time to promote the recovery of cotton as soon as possible. Use 50% to 75 kg of 0.2% potassium dihydrogen phosphate and 2% urea per mu, or spray 5-10 ml of Shibao or Foliage to spray 40-50 kg of water. Spray again 5-7 days after the first foliar application. After the cotton grows normally, 10-15 kg of urea is applied per acre. Potassium fertilizer in the cotton field is lost with water, and potassium fertilizer should be applied. 10 kg of potassium sulfate or 200-300 kg of plant ash per acre. By supplementing the fertilizer to accelerate the growth and development of cotton, promote early knotting, multi-growth autumn peach, prevent premature aging.
4. Control pests and diseases. The cotton has a strong stamina and is young and tender in the later stage. It is suitable for the occurrence of four generations of cotton bollworms, small bridgeworms and cotton leafhoppers. In mid-August and early August, attention should be paid to timely prevention and control. For 100 plots with more than 150 larvae of second instar larvae, chemical control should be carried out immediately. The control of cotton bollworm can be sprayed with 50% cotton boll, 40% Jiaxinbao, 20% methomyl 1500-2000 times liquid; control small small bridge insects, cotton large leafhopper, can be sprayed with 40% monocrotophos 1500 times liquid. If a rotten bell occurs, it should be sprayed with 0.8:0.8:100 Bordeaux mixture or carbendazim suspension 800-1000 times.
5. Chemical ripening. Due to the late hair growth, the main reason is that the autumn peaches capture the yield, and the proportion of flowers after the frost is often large. Therefore, in the first ten days of October, we chose a sunny day at noon, using 10-15 ml of ethephon per acre, spraying 40-50 kg of water, prompting the cotton boll to crack in the bell early, and strive for more pre-frost flowers.