Wheat midge is a devastating pest, which has a great impact on the yield and quality of wheat. It can reduce the production of wheat by 1-2% year-round, and the year of midge emergence can reduce production by 4-50%, and serious cases can reach 8-90%. There are two species of wheat midge: wheat red midge and wheat yellow midge. It takes 1 generation in China in one year. The growing larvae grow in the soil and overwinter overwinter. In the spring of next year, they move from the deep soil layer to the ground, and then turn into feathers. Red or yellow adults, the body image of mosquitoes, and then fly to lay eggs on the ears. The occurrence of pests is mostly the same as the growth stage of wheat. When the wheat emerges from the head, the adult feathers fly out. When the wheat is full, most of the insects fly out of the ears to lay eggs. After 4-5 days, the eggs are laid. The small larvae emerged, and the larvae drilled on the wheat grains of the wheat ears, punctured the wheat rind with their mouths, and sucked up the effluent slurry, causing the grains of the wheat grains to deflate, resulting in a reduction in yield. After 15-20 days, the larvae left the wheat ear to drill into the soil. Generally, the top soil is about 10 cm away from the ground, and when the humidity decreases, it reaches the ground for about 20 cm. The following measures should be taken to prevent and control midge pests: Select insect-resistant varieties that are resistant to insects. In recent years, planting plants such as Weinong 151 and Xuchuan 2111 have been highly resistant to insect pests. Use agricultural biological measures to prevent and control. In areas with serious midge traps, due to the greater density of insect pests, the crop layout can be adjusted and rotations carried out to make the insects lose the host. Deep plowing of the land can be carried out to expose the sucking insects hidden in the earth and promote its death. At the same time, it is necessary to strengthen the management of fertilizer and water. Spring irrigation is an important condition for promoting the rise of the midge. The spring irrigation should be reasonably reduced, and the water field should be kept as far as possible. Dry pipe. Applying basal fertilization, using less fertilizer in the spring, promotes the growth and development of wheat in a tidy and robust manner, and reduces the chance of invasion by the insects. Use chemical agents to prevent and control. The prevention and control of wheat midge adopts organophosphorus pesticides as the main control, especially in the flood control period, the best control effect can be achieved, which can directly kill part of earthworms and rising earth surface larvae, while suppressing adults. Its prevention and control method is to use poisonous soil (or poisonous sand) to spread by powder or emulsion, that is, to use 2% of 3% methyl-hexa-iohexowan powder per acre and evenly mix 20 kg of fine sand to make up toxic soil. Use, evenly into the wheat field. It is also possible to use 100-200 ml of 40% methylisoprenium phosphate emulsion per acre, dilute 2 kg of water, spray it evenly on 20 kg of dry fine soil, and spread wheat field.
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