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A Detailed Guide to the Harm Caused by Cotton Summer Aphids and Their Control Methods

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Cotton summer aphids are the offspring of aphids that reproduce during the cotton seedling stage. Summer aphids begin to harm cotton after the onset of the dog days, and their harmfulness is far greater than that of seedling-stage aphids. The oily excrement excreted by summer aphids covers the cotton leaves, reducing leaf surface function, hindering the normal progress of photosynthesis, and obstructing the transport of nutrients, causing the tender leaves of cotton to curl and shrink, which in turn causes cotton squares and bolls to drop. Therefore, doing a good job in controlling summer aphids is an important measure for striving for high yields and early production of summer bolls. 1. Grasp the timing of control: cotton summer aphids usually

Cotton summer aphids are the offspring of aphids that reproduce during the cotton seedling stage. Summer aphids begin to harm cotton after the onset of the dog days, and their harmfulness is far greater than that of seedling-stage aphids. The oily excrement excreted by summer aphids covers the cotton leaves, reducing leaf surface function, hindering the normal progress of photosynthesis, and obstructing the transport of nutrients, causing the tender leaves of cotton to curl and shrink, which in turn causes cotton squares and bolls to drop. Therefore, doing a good job in controlling summer aphids is an important measure for striving for high yields and early production of summer bolls.

1. Grasp the timing of control: cotton summer aphids usually are wingless aphids lurking on the lower leaves of cotton that crawl and migrate upward to the upper leaves, growing tips, and branches, while the wingless aphids on the upper part crawl downward or to the surrounding areas. When wingless aphids spread to the entire cotton plant, causing the nutrition of the whole plant to deteriorate and making it unable to meet the growth needs of wingless aphids, winged aphids are produced and migrate and spread outward. This vicious cycle causes extremely severe harm to cotton. Therefore, the time to control summer aphids should be before wingless aphids crawl from the lower part to the upper part and produce winged aphids. When 5%-8% of the cotton leaves in the cotton field are curled and shrunken, that is the best time for control, and the time should be in early to mid-July.

2. Combine traditional and modern methods, and apply pesticides comprehensively

When using chemical control, before applying the pesticide, first remove the 2-3 old leaves at the lower part of the cotton plant, and bury them deeply in a concentrated manner, compost them into fertilizer, or burn them, and then choose pesticides for control.

1. Dust control: For every 667 sq m, use 2.5% trichlorfon powder, or 1.5% 1605 powder or 1.5% dimethoate powder, 2000-6000 grams, and dust it on; trichlorfon powder mixed with plant ash at a 1:1 ratio can also be used.

2. Fumigation control method: When the cotton field has already closed its rows and it is difficult to control aphids on the lower leaf surfaces, using fumigation will achieve relatively good results. The method is to use 100-150 grams of 8% dichlorvos emulsion, add 4 kg-5 kg of water, spray it onto 5 kg-8 kg of wheat bran and mix well, and at noon or in the evening when there is no wind, scatter half on the ground and half on the cotton plants. You can also use 80% dichlorvos emulsion diluted to a 300-400 times solution, 20 kg-30 kg per 667 sq m, and spray it on the backs of the middle and lower leaves of the cotton plants, which can likewise produce a fumigation effect.

3. Spray control method: You can use 40% omethoate, or use 50% malathion emulsion diluted to a 1000-1500 times solution, 50 kg-60 kg per 667 sq m, and spray it on the backs of the cotton leaves, which also has a relatively good control effect. In the control of cotton aphids, when using organophosphorus pesticides such as 3911, 1605, 1059 and other systemic insecticides, it is very easy to cause human and livestock poisoning, and special attention should be paid to this.

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