Diseases and insect pests of Chinese yam and their control measures: control methods of bean tortoise shell and blue-winged negative mud insect

Yam bean tortoise shell and yam blue wing negative mud worm control method how to do? Do you know? Let's take a look.

The occurrence time of yam bean beetle pest is from May to August, and only one generation a year. The yam blue-winged negative mud worm also occurs one generation a year, overwintering as an adult. When the yam vine stretches out, the overwintering adults migrate into the cluster, and the young plants suffer the most. The larvae move slowly and have the characteristic of covering the body with excreted feces. The mature larvae pupate with white cocoons on the back of the leaves. After harming the yam, it will cause irregular holes in the young leaves and new buds, so that the top of the vine stops growing, and the serious damage to the leaves will affect the growth. On the other hand, the new generation of adults appeared around July and migrated to the overwintering place after a small amount of feeding.

For these two kinds of pests, the adults can be sprayed at the seedling stage and the adult stage is at the peak of adult activity, and the larvae are generally controlled by chemical root irrigation. But if you use medicine, you should also be more careful not to use too much, which will affect the quality of yam.