Corn borer, also known as corn borer, belongs to the order Lepidoptera. Its food habits are very complicated, mainly harming corn, followed by sorghum, millet, cotton, sunflower and other crops. Since the introduction of insect-resistant cotton, I have often encountered the problem of cotton farmers reflecting stems and fruit pods being killed by cotton bollworms. In many places in Fujian, Shandong and Henan provinces, the issue of corn borer damage to insect-resistant cotton has been reported in recent years, and the damage of corn borer against insect-resistant cotton has been increasing year by year. To this end, remind farmers to pay attention to controlling corn borer when planting insect-resistant cotton.
After the eggs of the corn borer hatched out of the larvae, they were drilled into the main stems and fruit branches of the cotton from the young tillers or leaves of the plants, causing the cotton plants to have dead branches, broken stems, and even died. Its larvae can also droop drooping, forming a transfer hazard as the wind drifts, posing a serious threat to cotton production. According to the field survey, the occurrence period of the first and second generations of corn borers was basically the same as the period of occurrence of the second and third generations of cotton bollworms. The second generation bollworm of insect-resistant cotton generally does not need to be controlled, but at this time, when the bud of cotton grows, the cotton plant grows young. Therefore, at this moment, cotton is most vulnerable to the damage of corn borer, and the damage is often heavy. In the past, when non-resistant cotton was planted, the corn borer did not harm the cotton shape because the bollworm was controlled when the bollworm was controlled. With the popularization of the insect-resistant cotton, the number of times the bollworm was used to control the bollworm was greatly reduced, and the corn borer was often obtained. If it does not cure, the harm will become more and more obvious, and it will rise from the secondary pest to the main pest. The cotton farmers' lack of understanding of the damage caused by corn borer often ignores the prevention and control. When the damage is heavy, the application of pesticides has missed the control period, so the control effect is mostly poor. In the year when the first generation of corn borer occurred, pest resistant cotton was seriously damaged by corn borer and the damaged plant was up to 10%. If it is not controlled in time, serious damage will be caused. From the results of years of field surveys, the damage of corn mash in scattered cotton fields is more important than the concentration of cotton fields. Therefore, it is necessary to pay attention to the prevention and control of corn mash.
To do a good job in preventing and controlling corn borer, it is necessary to strengthen pest monitoring and seize the key period of application. Grab the corn pupa spawning period, the larvae hatching early, when the insect cotton plant reached 3% immediately spray control. We must use pesticides that have good insecticidal effects and are safer for natural enemies. It can be sprayed with 1000-fold of 35% endosulfan, or 1500-fold of 20% doudouphos EC, or 1000-fold of 2.5% kaempferol, or 800-times of 40% water-containing phosphorothioate EC. It is also possible to use a 1:1 mixture of 1.8% avermectin and 10% imidacloprid wettable powder in a 1:2 ratio. In order to increase the effect of spraying, it is advisable to spray after 4 pm. Before the cotton is topping, the use of 100 times 35% cotton-anhydrous phosphoric acid as a drop injection for the core of the cotton plant will not only provide good control but also protect natural enemies. In addition, combined with management measures such as pruning in the field, artificial ovulation, insect trapping, and taking the branches out of the field, can eliminate a large number of pests.
After the eggs of the corn borer hatched out of the larvae, they were drilled into the main stems and fruit branches of the cotton from the young tillers or leaves of the plants, causing the cotton plants to have dead branches, broken stems, and even died. Its larvae can also droop drooping, forming a transfer hazard as the wind drifts, posing a serious threat to cotton production. According to the field survey, the occurrence period of the first and second generations of corn borers was basically the same as the period of occurrence of the second and third generations of cotton bollworms. The second generation bollworm of insect-resistant cotton generally does not need to be controlled, but at this time, when the bud of cotton grows, the cotton plant grows young. Therefore, at this moment, cotton is most vulnerable to the damage of corn borer, and the damage is often heavy. In the past, when non-resistant cotton was planted, the corn borer did not harm the cotton shape because the bollworm was controlled when the bollworm was controlled. With the popularization of the insect-resistant cotton, the number of times the bollworm was used to control the bollworm was greatly reduced, and the corn borer was often obtained. If it does not cure, the harm will become more and more obvious, and it will rise from the secondary pest to the main pest. The cotton farmers' lack of understanding of the damage caused by corn borer often ignores the prevention and control. When the damage is heavy, the application of pesticides has missed the control period, so the control effect is mostly poor. In the year when the first generation of corn borer occurred, pest resistant cotton was seriously damaged by corn borer and the damaged plant was up to 10%. If it is not controlled in time, serious damage will be caused. From the results of years of field surveys, the damage of corn mash in scattered cotton fields is more important than the concentration of cotton fields. Therefore, it is necessary to pay attention to the prevention and control of corn mash.
To do a good job in preventing and controlling corn borer, it is necessary to strengthen pest monitoring and seize the key period of application. Grab the corn pupa spawning period, the larvae hatching early, when the insect cotton plant reached 3% immediately spray control. We must use pesticides that have good insecticidal effects and are safer for natural enemies. It can be sprayed with 1000-fold of 35% endosulfan, or 1500-fold of 20% doudouphos EC, or 1000-fold of 2.5% kaempferol, or 800-times of 40% water-containing phosphorothioate EC. It is also possible to use a 1:1 mixture of 1.8% avermectin and 10% imidacloprid wettable powder in a 1:2 ratio. In order to increase the effect of spraying, it is advisable to spray after 4 pm. Before the cotton is topping, the use of 100 times 35% cotton-anhydrous phosphoric acid as a drop injection for the core of the cotton plant will not only provide good control but also protect natural enemies. In addition, combined with management measures such as pruning in the field, artificial ovulation, insect trapping, and taking the branches out of the field, can eliminate a large number of pests.
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