Causes of poor prevention and control of corn armyworm and correct control measures

Corn armyworm is a common pest in the process of corn planting, which has the characteristics of long-distance migration and concentrated outbreak. Because of the influence of high temperature climate, the control effect of corn armyworm is not very good, which has a great impact on corn yield. So how to prevent and control the corn armyworm correctly? Let's get to know it with the editor.

1. Reasons for poor prevention and control effect

The reason for the poor prevention and control of corn armyworm is due to the lack of prevention and control time and control measures. generally, corn armyworm is transferred from the corn field to peach trees for spawning and reproduction, so it is necessary to carry out prevention and control after grafting peach seedlings. At this time, the armyworm is in the larval stage, which is the best period for prevention and control. Once this period is missed, it will be extremely difficult to prevent and control pests after the outbreak. Because the armyworm will spin silk to wrap the surrounding leaves together and wrap itself up, the potion is difficult to infiltrate and destroy.

Second, correct prevention and control measures

1. Physical prevention and control

The so-called physical prevention and control is manual prevention and control, since the armyworm will spin silk to wrap the surrounding leaves together and wrap itself up, then we can squeeze the infected leaves against each other and pinch the armyworm to death directly. This method of single plant is time-consuming and laborious, and if it is planted in a small area, it is completely impractical for large area planting, but it can be used as an auxiliary means.

2. Chemical prevention and control

Chemical prevention and control can be divided into biological pesticide prevention and control and chemical pesticide prevention and control, in which biological pesticide prevention and control mainly uses Bacillus thuringiensis, which plays an important role in plant disease control and has been widely used in green organic agriculture. It has a good prevention and control effect on all kinds of Lepidoptera pests, because it belongs to microbial insecticides, so the killing speed is relatively slow, which is also its shortcoming. If the base number of pests is large, in addition to increasing the multiple of required drugs, it can also be used together with pyrethroids insecticides, and the control effect is better. Pesticide control can adopt the prevention and control formula of methylvitamin salt + chlorobenzamide + organosilicon auxiliaries, which can be used continuously for 2-3 times, each time at an interval of 4-7 days, to prevent and control pests. This formula has a strong quick effect and a long duration, and if you add some ovicidal agents, you can get twice the result with half the effort.

The above is the correct prevention and control measures of corn armyworm introduction, hope to help you, want to know more related knowledge, please follow us.