Control Methods for Yam Bean Beetle and Blue-Winged Leaf Beetle

How should the control methods for yam bean beetle and yam blue-winged leaf beetle be carried out? Do you know? Let's take a look together.

The yam bean beetle pest occurs from May to August, with only 1 generation per year. The yam blue-winged leaf beetle also has 1 generation per year and overwinters as an adult. When the yam vines extend outward, the overwintering adults migrate in and gather to cause damage, with young plants suffering the most severe damage. The larvae move slowly and have the characteristic of covering their bodies with their own excrement. The mature larvae spin white cocoons on the undersides of leaves to pupate. After damaging the yam, they cause irregular holes in young leaves and new buds, causing the vine tips to stop growing, and severely damaged leaves will affect growth. The new generation of adults appears around July, feeds a small amount, and then migrates to overwintering sites.

For these two pests, during the yam seedling stage, pesticides can be sprayed during the peak activity period of the adults to control the adults, and the larvae are generally controlled by drenching the roots with pesticide. However, when using pesticides, you should also pay extra attention not to use excessive amounts, as this will affect the quality of the yam.