The latest course on the techniques and methods of cotton pest control

Cotton is one of the most important crops in the world, with large output and low production cost, so that the price of cotton products is relatively low. The fiber can be made into a variety of fabrics, from light and transparent Bari yarn to thick canvas and velveteen. It is suitable for making all kinds of clothes, furniture cloth and industrial cloth. The countries with the highest output are China, the United States and India. Let's take a look at cotton pest control technology.

APHIS gossypii

[damage characteristics] the seedling aphid occurred after emergence to budding, and the control began when the leaf curling rate reached more than 30%. The cotton aphid was at its peak from mid-June to late July.

[control method] 10% imidacloprid wettable powder + 800-fold solution of new high-fat film or 15% EC + 800-fold solution of new high-fat film can be selected for uniform spraying of stems and leaves. When the aphid occurs in the bud and boll stage, due to the high temperature, we can choose 3% acetamiprid EC 2000 times liquid plus 40% chlorpyrifos 1200 times solution + new high fat film 1200 times solution to control aphids and other pests. After the cotton plant is closed, 80% dichlorvos EC + 800 times of new high fat film can be sprayed on cotton ridges in sunny and windless evening, which has a good effect on aphids and can also control cotton red spiders.

Cotton spider mite

[hazard characteristics] it began to appear in cotton fields in early May, when the temperature was lower, the reproduction rate was slow, the number of single-leaf mites was less, and the damage of cotton seedlings was less. From early June to late July, the temperature rose rapidly, cotton spider mites began to multiply in large numbers, concentrated damage, and the damage was rampant in dry years.

[control method] you can choose 15% trimethoprim EC + 800-fold solution of new high-fat membrane, or 1.8% adriamycin + 800-fold solution of new high-fat membrane for spray control.

Cotton bug bug

[damage characteristics] the damage of cotton bug to cotton is increasing year by year, and the chemical control period is in the middle and late June, during which the cotton plant is relatively young. In case of heavy rain and high relative humidity in cotton field, it is beneficial to the harm of cotton bug bug. This period is the key period of control.

[control method] in cotton bud stage and boll stage, 5% acetamiprid EC + 800-fold solution of new high-fat film or 4.5% cypermethrin EC + 800-fold solution of new high-fat film can be used to control cotton bollworm at the same time.

Cotton bollworm

[damage characteristics] Helicoverpa armigera is the main pest in cotton bud and boll stage, which generally occurs 4 generations a year. The cotton is mainly damaged by the second and third generations, and the larvae eat buds, flowers and bolls, and the eaten cotton bolls are easy to rot and fall off or become stiff petals.

[control method] physical control of ①: install Jiaduo frequency vibrating insecticidal lamp in cotton concentrated planting area, equipped with one set per 60 mu, the effect of continuous use is better. ② chemical control: you can choose 90% Wanling wettable powder + new high-fat film 800x liquid, 4.5% cypermethrin EC + new high-fat film 800x liquid or 1.8% avermectin + new high-fat film 800x solution for stem and leaf spray, spray once every 7 days for 3 times in a row, and evenly spray 20% cypermethrin EC + new high-fat film 800x solution or 20% cyanma EC 1500 times when cleaning up the residue in the later stage.

Fusarium wilt

[hazard characteristics] Fusarium wilt is a disease that harms the vascular tissue of cotton, causing discoloration, dryness, shedding and wilting of cotton leaves, and sometimes successively withered, affecting the yield.

[control method] in the cotton bud stage, Huanghuangweiling can be sprayed with 40 grams per mu of water (preferably with continuous irrigation) for 3 or 4 times.

Verticillium wilt

[hazard characteristics] generally, the disease began to appear at the stage of 3-5 true leaves, and a large number of diseases occurred in the field after budding in the middle and later stage of growth, which could easily lead to the death or wilting of the whole plant.

[prevention and control methods] the general medicaments include carbendazim, methyl topiramate, Kehuangku, withered yellow base factor, cotton Sanqing, etc., and add nutrition regulators such as potassium dihydrogen phosphate, boron fertilizer, boron plus selenium, zinc fertilizer, zinc plus selenium, Tianfengsu, fish protein, etc., every 5-7 days, spray 2 times for 3 times.

Spodoptera exigua

[hazard characteristics] Spodoptera exigua is an omnivorous pest, which occurs for 4 to 5 generations a year, with serious generation overlap and irregular age. High temperature and drought climate factors and mixed cultivation conditions of many kinds of crops are beneficial to the occurrence of beet armyworm. Cotton fields with extensive management and weeds are more serious.

[control method] 0.2% methylvitamin salt + 800-fold solution of new high-fat membrane or 25% diflubenzuron suspension + 800-fold solution of new high-fat film can be selected and sprayed evenly on cotton plants and field weeds for 2 times for 3 times.