The latest causes of poor prevention and control of corn armyworm and correct prevention and control measures

Corn armyworm is a common pest in corn planting process, which has the characteristics of long-distance migration and concentrated outbreak. Many farmers do not have good control effect due to high temperature climate in the control process, which has a great impact on corn yield. So how should corn armyworm be properly controlled? Let's get to know it together with Xiaobian.

I. Reasons for poor prevention and control effect

The reason for poor prevention and control of corn armyworm is that the prevention and control time and measures are not in place. Generally, corn armyworm migrates from corn field to peach tree for spawning and reproduction, so prevention and control should be carried out after grafting peach seedlings. At this time, the armyworm is in the larval stage, which is the best prevention and control period. Once this period is missed, it will be extremely difficult to prevent and control after the pest outbreak. Because the armyworm would spin silk and wrap itself around the surrounding leaves, it was difficult for the medicine to penetrate and destroy it.

II. Correct prevention and control measures

1. Physical prevention and control

The so-called physical prevention and control is artificial prevention and control. Since the armyworm will spin silk to wrap the surrounding leaves together and wrap itself up, we can squeeze the diseased leaves together and pinch the armyworm directly to death. This method of single plant is time-consuming and laborious. If it is planted in small areas, it is completely unrealistic for large-scale 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, among which biological pesticide prevention and control mainly uses Bacillus thuringiensis, which plays an important role in plant disease prevention and control and has been widely used in green organic agricultural production. It has good control effect on various lepidopteran pests, because it belongs to microbial pesticides, so the speed of killing insects is relatively slow, which is also its shortcoming. If the pest base is large, in addition to increasing the multiple of drugs, it can also be used together with pyrethroid pesticides, and the control effect is better. Pesticide control can adopt emamectin + chlorantraniliprole + organic silicon adjuvant spraying prevention and control formula, continuously used 2-3 times, each time interval 4-7 days, to prevent and control pest damage. This formula is quick acting and has a long shelf life. If you add some ovicides, the effect will be doubled with half the effort.

The above is the introduction of correct prevention and control measures for corn armyworm. I hope it can help you. If you want to know more about relevant knowledge, please pay attention to us.