Rational selection of pesticides is the key to improving the control of cotton bollworms. In recent years, there are many varieties of pesticides used in cotton fields, and there are hundreds of varieties of insecticides and compounding agents. These drugs have different control targets and effects, and the price is very different. They must be selected when purchasing and using.
Among the pyrethroid pesticides, enemy killing, cyhalothrin, high-performance lyrein, kungfu, etc. have good control effect against cotton bollworm, but cotton aphid has been highly resistant to such pesticides and is used for prevention and control. The mites are almost ineffective. Therefore, when the cotton aphid and the cotton bollworm are mixed, it is generally not necessary to choose the pyrethroid pesticide. In production, the pyrethroid pesticide is mainly used to deal with the third generation of cotton bollworm. Among the organophosphorus pesticides, phoxim and dichlorvos have a good effect on the control of cotton bollworms, but phoxim is easy to decompose and dichlorvos are volatile. The efficacy period is very short, so pay attention to increase the frequency of application. Methamidophos has a good effect on young larvae, especially in the case of large occurrences. As long as the drug is sprayed at the appropriate time, the control effect is extremely obvious. The broad-spectrum phosphorus insecticide is broad-spectrum, effective against cotton bollworm, cotton aphid, red spider, etc., but the effect is general. It is difficult to effectively control the harm of monocrotophos alone when the cotton bollworm occurs. Methyl 1605 is superior to monocrotophos in controlling cotton bollworm, but it is a highly toxic pesticide, which is easy to cause poisoning by pesticides. Pay special attention to protection when using it, and avoid applying it at hot noon. Among the urethane pesticides, methomyl (also known as Wanling) has a good control effect on cotton bollworm, which not only kills young larvae, but also is effective for killing eggs. Among the compounding agents, the control effects of cotton bollworm, jinglingling and Xinguang No. 1 on cotton bollworm are more prominent. Among the biological pesticides, in recent years, the large-scale promotion of cotton areas in various regions is mainly Bt preparations, which are suitable for spraying at the peak of hatching period, generally 2-3 days earlier than spraying chemical pesticides, and have higher control effect on newly hatched larvae.
In addition, do a good job in pest investigation, timely spraying and prevention; improve spraying methods to improve the quality of prevention and control; alternate use of pesticides, reduce pest resistance and other measures is also the key to improve the anti-cotton bollworm.
Among the pyrethroid pesticides, enemy killing, cyhalothrin, high-performance lyrein, kungfu, etc. have good control effect against cotton bollworm, but cotton aphid has been highly resistant to such pesticides and is used for prevention and control. The mites are almost ineffective. Therefore, when the cotton aphid and the cotton bollworm are mixed, it is generally not necessary to choose the pyrethroid pesticide. In production, the pyrethroid pesticide is mainly used to deal with the third generation of cotton bollworm. Among the organophosphorus pesticides, phoxim and dichlorvos have a good effect on the control of cotton bollworms, but phoxim is easy to decompose and dichlorvos are volatile. The efficacy period is very short, so pay attention to increase the frequency of application. Methamidophos has a good effect on young larvae, especially in the case of large occurrences. As long as the drug is sprayed at the appropriate time, the control effect is extremely obvious. The broad-spectrum phosphorus insecticide is broad-spectrum, effective against cotton bollworm, cotton aphid, red spider, etc., but the effect is general. It is difficult to effectively control the harm of monocrotophos alone when the cotton bollworm occurs. Methyl 1605 is superior to monocrotophos in controlling cotton bollworm, but it is a highly toxic pesticide, which is easy to cause poisoning by pesticides. Pay special attention to protection when using it, and avoid applying it at hot noon. Among the urethane pesticides, methomyl (also known as Wanling) has a good control effect on cotton bollworm, which not only kills young larvae, but also is effective for killing eggs. Among the compounding agents, the control effects of cotton bollworm, jinglingling and Xinguang No. 1 on cotton bollworm are more prominent. Among the biological pesticides, in recent years, the large-scale promotion of cotton areas in various regions is mainly Bt preparations, which are suitable for spraying at the peak of hatching period, generally 2-3 days earlier than spraying chemical pesticides, and have higher control effect on newly hatched larvae.
In addition, do a good job in pest investigation, timely spraying and prevention; improve spraying methods to improve the quality of prevention and control; alternate use of pesticides, reduce pest resistance and other measures is also the key to improve the anti-cotton bollworm.
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