Wheat midge is a worldwide pest. It is of the order Diptera, Lepidoptera, female adults 2–2.5 mm long, males 1.5–2 mm long, and larvae 2-3 mm long. One generation or many generations. In adverse environments, larvae can sleep in the soil for more than a decade. When the conditions are right, the dormancy continues to reproduce. The wheat midge worms in the soil with mature larvae in winter and summer. After spring wheat turns green, the larvae dormant when the 10cm ground temperature reaches around 10°C, and they move to surface soil. When the local temperature reaches about 15°C, the larvae do long-term pupation, and the flood season is about 10 days. When the local temperature reached around 20°C, the earthworms began to emerge into adult worms. On the day after mating, the eggs were laid on ears that had not yet been flowered. The eggs hatched for about 4 days and the larvae penetrated into the wheat grains to suck the juice. The larval period is about 20 days. It matures during the ripening period of wheat, extends from the wheat ears in the rain or when it is wet, and shoots off the ground. Grains of wheat damaged by wheat worms cause necrosis, resulting in empty grains and loss of grain value. Wheat midge resistant to low temperature resistant to high temperature, the temperature reached 50 °C when the larvae died; hi wet afraid of dry, larvae immersed in water for 20 days, still able to survive, and mixed with dried grains in more than 10 days will die. The wheat midge insects are extremely harmful. In the occurrence of wheat fields, the yield is generally reduced by 10%-50%, and serious plots reduce production by more than 80%, and even result in absolute production. In recent years, the region has expanded rapidly and the damage has been increasing year by year. In our province, Lunan spreads to the northwest, and Jining, Lincang, Zaozhuang, Liaocheng and other places have the most serious damage. The area of ​​occurrence exceeds more than 100 million mu, and there is rapid spread and expansion. If you do not pay attention, there may be a major outbreak. Whether or not the wheat midge outbreaks mainly depends on the number of insects, climate, and soil conditions. In recent years, due to the increase in the area of ​​rotation cultivation, the reduction in the number of deep plowing, and the improvement of water conservancy conditions, it has provided favorable conditions for the survival of wheat midge insects and field reproduction, and the population density has been increasing year by year. In areas with poor water conditions, the soil moisture content is low, and the midge in trapped soils gradually accumulates and emerges as new ones, hiding hidden dangers for subsequent major occurrences. In addition, the thin-grained white husks promoted in recent years are beneficial to the invasion, feeding, and survival of midge larvae, which is one of the reasons for the recurrence of wheat midge in recent years. Drug control of wheat midge worms: 1. Prevention and control of wheat soil in jointing and booting stage of wheat. This is a critical period for controlling wheat midge. Can be used 50% phoxim EC 150 ml, 5 kg of water, sprayed on 20 kg of dry soil, mixed and made of toxic soil sprinkled on the surface, to carry out plucking, the toxic soil mixed with the topsoil, kill larvae. It is also possible to use 0.04% of insecticide powder or 4.5% of Aldehyde powder or 4% of enemy powder 2 kg, mixed with 30 kg of fine soil, sprinkled on the surface of the wheat field, carry out demarcation, mixing poisonous soil into the topsoil, and also can spread medicine. After the watering effect is better. 2, wheat spraying control at the heading stage, this is mainly to prevent adults. Available with 50% phoxim EC, 80% dichlorvos EC, 36% Kosmochi oil 1000-1500 times or 2.5% deltamethrin EC, 20% cypermethrin EC 4000 times, or 4% Horse powder or 2% carbaryl powder 2 kg dust control.