There are often different levels of locust disasters in the rainy season in the cotton region. After the cotton is subjected to mites, it dies and falls, and the buds, flowers, and bells fall off a lot. The main component of the yield is almost lost. Effective remedies should be taken for this.
Immediately after draining the flooded cotton field, Fumian Loose Soil will strengthen the cotton plant and stabilize the soil, so that the cotton plant grows upright, improve the ventilation and light transmission conditions of the cotton field, and reduce the loss caused by lodging. 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.
After the late hitting of the cotton, after the recovery, through the remedial measures, the growth of the stamina is greater, the time to beat the heart can be postponed for about 7 days, in order to facilitate the autumn peach.
After the fight for the autumn peach cotton, the growth period is obviously delayed, and it is necessary to carry out foliar fertilization in time to promote the recovery of cotton as soon as possible. Use 0.2% potassium dihydrogen phosphate and 2% urea mixed solution 50-75 kg per mu, or spray Shibao or foliar treasure 5-10 ml to spray 40-50 kg of water. Spray again 5 to 7 days after the first foliar application. After the cotton grows normally, 10 to 15 kg of urea is applied per acre. Potassium fertilizer in the cotton field should be supplemented with water, and potassium fertilizer should be applied. 10 kg of potassium sulfate or 200-300 kg of plant ash per mu. By supplementing the fertilizer to accelerate the growth and development of cotton, promote early knotting, multi-growth autumn peach, prevent premature aging.
The prevention and control of pests and mites are more stable, and the growth is younger in the later stage. It is suitable for the occurrence of four generations of cotton bollworms, small bridgeworms and cotton leafhoppers. In the middle and late August, attention should be paid to timely prevention and control. Where there are more than 150 fields with more than 150 larvae of the second instar, the pesticide should be immediately controlled. For the control of cotton bollworm, 50% cotton boll, 40% Jiaxinbao, 20% methomyl 1500 ~ 2000 times liquid spray; prevention and control of small bridge insects, cotton large leafhopper can be sprayed with 40% monocrotophos 1500 times liquid. If rotten bells occur, spray 0.8:0.8:100 Bordeaux mixture or carbendazim suspension 800-1000 times.
Chemical ripening is affected by the late bloom of cotton, mainly relying on autumn peach to capture the yield, often the proportion of flowers after frost is large. Therefore, in the first ten days of October, choose sunny afternoon, use 10-15 ml of ethephon per acre, spray 40-50 kg of water, and promote the early maturation and cracking of the cotton boll, and strive for more pre-frost flowers.
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