Better control of pests in mid and late cotton

Our province is a major cotton producing province. How to reduce the incidence of pests and diseases in the middle and late cotton crops and raise cotton production is a major concern for cotton farmers. The author combined with practical experience, summed up the following methods of controlling pests and diseases for the majority of cotton farmers reference.

Management prevention

Beat the heart: time is usually before August 10. According to the growth of cotton, control the cotton closure time and the degree of closure, adjust the time for ringing and ringing. Invalid flower buds were removed: flowers that bloomed immediately after the beginning of the autumn and after the white dews were removed. Ear buds and old leaves of empty branches can be removed together with pruning. Timely control: According to the amount of rainfall and cotton growth timely and appropriate chemical regulation. Drought Relief: During the middle and late stages of cotton growth, it is the period of frequent droughts and floods in our province. Drought and flood disasters have a great impact on the growth and yield of cotton. When the cotton field's 20-40 cm soil moisture content is less than 60% of the field's water holding capacity, it should be watered in a timely manner. The furrow irrigation method can be used to prevent rain after pouring. When the water in the cotton fields is drained, drain the water in a timely manner and carry out shallow cultivating. In the later growth period of cotton, it is necessary to prevent autumn drought. When the soil moisture in early September is lower than 55%-60% of the maximum water capacity, watering is required. Fertilizers outside the root: If there is a deficiency of nitrogen in the late growth period of the cotton, 50 to 100 times of urea solution can be sprayed outside the area per mu, and 75 kg of urea solution will be sprayed. Since mid-August, spray once a week and spray three times. The peak period of cotton bolls is the peak period of phosphorus demand, especially in the saline-alkaline cotton fields where phosphorus deficiency is severe. From mid-August, fertilization with foliar fertilizers was performed with 50-fold superphosphate extract or 300-500-fold potassium dihydrogen phosphate solution. Spray once every 10 days and spray 3 times.

Chemical control

In recent years, verticillium wilt, red leaf blight, cotton leaf borer and whitefly have been aggravated, so prevention and control should be carried out in time. Cotton wilt disease: 40% carbendazim or 65% mancozeb WP can be used for foliar spray control. Red stem blight of cotton: In the early stage of disease, the leaves can be sprayed with 2% potassium dihydrogen phosphate or potassium chloride solution, spraying once every 7 days, and spraying 2 or 3 times, which can reduce the stem blight of cotton leaves. occur. Verticillium wilt in cotton: In the early stage of disease, 40% carbendazim can be used to irrigate the roots (0.5 kg per plant), or 500 times of fulvic acid plus 500 times of antidepressant mixture spray. Cotton aphid (Fuxi): control the rate of leaf rolling at 5% to 10%. Can choose 25% zotarone EC 1000 ~ 1500 times, or 4.5% high cis-Betapermethrin 1000 ~ 2000 times, or 50% Profenofos EC 1000 ~ 1500 times, or 10% imidacloprid wettable powder 2000~3000 times liquid targeted spray. Helicoverpa armigera: 15 out of a hundred young larvae of three generations of Helicoverpa armigera and eight to ten young larvae of four generations of Helicoverpa armigera were treated. Can choose 35% endosulfan EC 1000 ~ 1500 times, or 20% methomyl EC 1500 ~ 2000 times, or 2.5% KDF 5000 times, or 50% Profen EC 1000 ~ 1500 times, Or 2.5% deltamethrin EC 1000 times spray control. Cotton leafhopper: 10% Liuyangmycin EC can be used for 1500-2000 times, or 20% Broom Net Emulsion 1000 times, or 20% fenchone EC 2000 times, or 1.8% avermectin. Emulsion 1500 ~ 2000 times liquid evenly spray, or 0.9% aforeun EC with 56 ~ 167 ml per mu, or 1.8% avicin cyanide EC with 70 ml per mu, the water 30 ~ 60 kg evenly spray. Bemisia tabaci: When the average nymphs per leaf of cotton plants range from 11 to 15 heads, 10% imidacloprid wettable powder 2000 times, or 1.8% avermectin worms 1500-2000 times, or 25% flutter Ling Ling EC 1000 ~ 1500 times liquid on the back of the blade body spray. At the same time, attention should be paid to the prevention and control of pests such as cotton thrips, cotton aphids, etc

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