There are many bugs growing in the corn at home today, which is disgusting. Who can tell me what this bug is and how serious it will be-in fact, it is already very serious now.

The mature larvae of Asian corn borer are about 25mm long, cylindrical, with dark brown head, light brown, dark brown, grayish yellow and other colors on the back, four hairy tumors on the middle and back chest and back, and two rows of hairy tumors on the abdomen and back, located at 1~8.

The generations of Ostrinia furnacalis changed significantly with latitude: in China, there are 1 generation, 45 ~ 40 2 generation, 40 ~ 30 3 generation, 30 ~ 25 4 generation and 25 ~ 20 5 ~ 6 generation to the north of latitude. The higher the altitude, the less algebra.

There are 2~4 generations a year in Sichuan province, with high temperature, low altitude and many generations. Usually, the mature larvae overwinter in the stalks and spikes of corn or the stalks of sorghum and sunflower, pupate in April-May of the following year, and emerge after about 10. Adults are nocturnal, with strong flying ability and phototaxis, and their life span is 5- 10 days. They like to lay eggs on both sides of the midrib on the back of corn leaves more than 50 cm above the ground. A female moth can lay 350-700 eggs for 3-5 days. After hatching, the larvae gather together first, then crawl in the tender part of the plant and start to do harm. The newly hatched larvae can spin silk and droop, and move adjacent plants by wind, which causes the harm of plant transfer. Most larvae are fifth instar larvae. Before the third instar, they mainly feed on tender heart leaves, tassels, bracts and filaments. After the damaged heart leaves are unfolded, many transverse holes appear. After the fourth age, most of them drill into the stem. The harm of corn borer is that the photosynthetic efficiency will decrease after the leaves are bitten by larvae; The tassels are eaten by insects and often easily broken, which affects pollination; Bract leaves and filaments are eaten by insects, which will cause grain loss and grain loss; After the stems, stalks and rachis are eaten, tunnels are formed, which destroy the transportation of water and nutrients in plants, increase the folding rate of stems and reduce the grain yield. The corn borer is suitable for development in high temperature and high humidity. The winter temperature is higher, and the parasitic amount of natural enemies is less, which is beneficial to the reproduction of the corn borer and is more harmful. In the egg stage, the leaves of corn are curled, and the egg pieces are easy to fall off from the back of the leaves and die, which is less harmful.