How to control cotton aphids in summer? These methods you need to master

Control of cotton aphids in summer

1. Rotate the use of pesticides. Rotate the use of conventional field pesticides such as acetamiprid, imidacloprid and chlorpyrifos to reduce the likelihood of aphids developing resistance. Once aphids develop resistance to a certain chemical pesticide, even if you increase the number of applications and raise the pesticide concentration, you will not achieve the desired control effect.

2. Spray the affected parts evenly and thoroughly. Cotton is now in full bloom and the plants are tall, so when spraying you must be careful and thorough, focusing on spraying the undersides of the leaves in the middle and lower parts of the cotton plant, strictly preventing missed spraying and missed coverage, and truly ensuring the quality of each spraying. Because aphids reproduce quickly, if one spraying is not thorough it will leave a large number of surviving insects, making the next control effort more difficult. Generally, the amount of spray solution used is 50-60 kg per mu.

3. It is recommended to use some new pesticides. For plots where conventional pesticides such as acetamiprid and imidacloprid have shown no obvious control effect, new pesticides such as 10% nitenpyram aqueous solution, 20% carbosulfan emulsifiable concentrate or 10% clothianidin can be used for control. Generally, 10% clothianidin wettable powder at 20 grams per mu or 10% nitenpyram aqueous solution at 20 milliliters per mu.

4. The timing of application should be appropriate. During high temperatures, avoid the midday period and try to apply the pesticide in the early morning or evening, preferably before 10 a.m. or after 4 p.m. This can ensure personal safety on the one hand, and on the other hand can avoid rapid evaporation and loss of the spray solution caused by high temperatures, which reduces efficacy.