How to control corn willow beetle? What are the methods and measures?

Corn leaf beetle is distributed in all provinces and regions of China, which greatly affects farmers' planting benefits. Therefore, we must take timely measures to prevent and control it. So, what should farmers do? This article will introduce you in detail, as follows:

Harmful symptoms:

Adults and larvae feed on leaves in notches or holes.

Occurrence law:

(1) generation. There are 4 ~ 5 generations a year in Henan and 5 ~ 6 generations in Beijing. (2) Overwintering and insect source: Overwintering with adults in soil, fallen leaves and weeds.

Living habits:

Every April, when the willows germinate, they come out to harm the bud leaves and lay eggs in piles on the leaves. Each female lays more than 1000 eggs for 6-7 days. The newly hatched larvae gather together to do harm and eat mesophyll. The larval stage is about 10 day, and the mature larvae pupate on the leaves. In mid-September, both adults and larvae can be seen, and they have suspended their lives.

Preventive and control measures:

(1) chemical control. Spraying 20% chrysanthemum hemp EC 2000 times or 50% phoxim EC 1000 times, 50% malathion EC 1000 ~ 1500 times and 20% insecticide WP 2000 times.