Twill nocturnal moth
Harmful features
The larvae feed on leaves, buds, flowers and fruits, and in severe cases can eat the whole field crop. On kale and cabbage, it can be mothed into leaf bulbs and heart leaves, and excret feces, causing pollution and decay, making it lose its commodity value; on green onions, first eat the epidermis of green onions, and then moth into tubular leaves.
• Crawl out in the evening to get food, and in case of shock, you will fall to the ground and curl up in a state of fake death.
• When food is insufficient or not in time, the larvae can migrate in groups to nearby fields to harm, hence the common name "marching insect".
Habits of life
In July, August and September of each year for the large occurrence period, adult insects nocturnal, light,flight is strong, like to lay eggs on tall, dense, dense green marginal crops, adult insects like to lay eggs in the leaf dorsal leaf vein bifurcation, hatching larvae cluster as pests, eating miscellaneous, pre-three-year-old to eat leaf flesh, residual epidermis and leaf veins, dispersed after four instars, and into the overeating period, high temperature weather during the day to hide in the soil of the plant rhizosphere, come out at night to feed.
Prevention and control methods
• The larvae of the twill moth have the habit of nocturnal activity to feed on pests, so spraying should be carried out around the evening, while the liquid is evenly sprayed on the leaf surface of each vegetable.
The agent can be selected with methylphenidate or avermectin products.
• Medication is given during the peak period of egg incubation, and other agents are sprayed before the larvae are 3 years old.