How to control cotton pests and diseases? Latest technical method tutorial
Cotton is one of the most important crops in the world. Its high yield and low production cost make cotton products relatively inexpensive. The fiber can be made into fabrics of many specifications, from lightweight and transparent voile to thick canvas and thick velveteen, suitable for making all kinds of clothing, furniture fabric and industrial fabric. The countries with the highest output are China, the United States and India. Now let us take a look at cotton pest and disease control techniques!
Cotton aphid
[Damage characteristics]Seedling aphids occur from emergence to after squaring. Control begins when the leaf curl rate reaches more than 30%. Mid-June to late July is the peak period of cotton aphid damage.
[Control method]You can choose 10% imidacloprid wettable powder + 800-fold Xin Gao Zhi Mo solution or 15% Jin Hao Nian emulsifiable concentrate + 800-fold Xin Gao Zhi Mo solution for uniform spray on stems and leaves. When summer aphids occur during the bud and boll stage, because of the high temperature, you can choose 3% acetamiprid emulsifiable concentrate 2000-fold solution plus 40% chlorpyrifos 1200-fold solution + 800-fold Xin Gao Zhi Mo solution to control aphids and other pests at the same time. After the cotton plants close the rows, you can also use 80% dichlorvos emulsifiable concentrate + 800-fold Xin Gao Zhi Mo solution and spray it between the cotton ridges on a sunny, windless evening. This has a good effect on summer aphids and can also control cotton red spider mites.
Cotton leaf mite
[Damage characteristics]It begins to appear in spots and patches in cotton fields in early May. At this time the temperature is relatively low, the reproduction speed is slow, the number of mites per leaf is small, and cotton seedlings suffer relatively light damage. From early June to late July, the temperature rises quickly, cotton leaf mites begin to reproduce in large numbers and cause concentrated damage, and in dry years the damage is rampant.
[Control method]You can choose 15% Sao Chong Man Jing emulsifiable concentrate + 800-fold Xin Gao Zhi Mo solution, or 1.8% abamectin + 800-fold Xin Gao Zhi Mo solution for spray control.
Cotton mirid bug
[Damage characteristics]The damage caused by cotton mirid bugs to cotton has increased year by year. The chemical control period is in mid-to-late June. During this period the cotton plants are relatively tender. If there is frequent rain, the climatic conditions of high relative humidity in the cotton field are favorable for cotton mirid bug damage. This period is the key period for control.
[Control method]At the cotton bud stage and boll stage, you can choose 5% acetamiprid emulsifiable concentrate + 800-fold Xin Gao Zhi Mo solution or 4.5% beta-cypermethrin emulsifiable concentrate + 800-fold Xin Gao Zhi Mo solution for spray control. The effect is relatively good, and it also controls cotton bollworm at the same time.
Cotton bollworm
[Damage characteristics]Cotton bollworm is the main pest during the cotton bud and boll stage, and generally has 4 generations a year. It mainly damages cotton in the second and third generations, mainly through larvae boring into and feeding on buds, flowers and bolls. Bored cotton bolls easily rot and drop off or become stiff bolls.
[Control method]① Physical control: Install Jiaduo frequency-vibration insect-killing lamps in concentrated cotton planting areas, one set for every 60 mu, and the effect is better when used in contiguous areas. ② Chemical control: You can choose 90% Wan Ling wettable powder + 800-fold Xin Gao Zhi Mo solution, 4.5% beta-cypermethrin emulsifiable concentrate + 800-fold Xin Gao Zhi Mo solution or 1.8% abamectin + 800-fold Xin Gao Zhi Mo solution for stem and leaf spraying, once every 7 days, for 2 to 3 consecutive sprays. For later residual control, you can use 20% Xin Mie emulsifiable concentrate + 800-fold Xin Gao Zhi Mo solution or 20% cypermethrin-malathion emulsifiable concentrate 1500-fold solution for uniform spraying.
Fusarium wilt
[Damage characteristics]Fusarium wilt is a disease that damages the vascular bundle tissue of cotton, causing symptoms such as cotton leaf discoloration, drying, shedding and wilting. In severe cases, patches die off, affecting yield.
[Control method]At the cotton bud stage, use Ku Huang Wei Ling at 40 grams per mu diluted with water for spraying (preferably spraying together with irrigation) 3 to 4 times.
Verticillium wilt
[Damage characteristics]Symptoms generally begin at the 3 to 5 true leaf stage. In the middle and late growth stages, after cotton squaring, the disease breaks out heavily in the field, easily causing the entire plant to die or wilt.
[Control method]Common agents include carbendazim, thiophanate-methyl, Ke Huang Ku, Ku Huang Ji Yin Su, cotton San Qing and others, plus nutritional regulators such as monopotassium phosphate, boron fertilizer, boron plus selenium, zinc fertilizer, zinc plus selenium, Tian Feng Su, fish protein and others. Spray each time at an interval of 5 to 7 days, for 2 to 3 consecutive sprays.
Beet armyworm
[Damage characteristics]Beet armyworm is an omnivorous pest and occurs 4 to 5 generations a year, with severe overlapping generations and uneven larval instars. High-temperature and dry climatic factors and cultivation conditions with multiple crops mixed together are favorable for the occurrence of beet armyworm. Generally, cotton fields with extensive management and many weeds suffer heavier occurrence.
[Control method]You can choose 0.2% emamectin benzoate + 800-fold Xin Gao Zhi Mo solution or 25% chlorbenzuron suspension concentrate + 800-fold Xin Gao Zhi Mo solution, and spray evenly on cotton plants and field weeds, for 2 to 3 consecutive sprays. The effect is relatively good.