Wheat red-sucking midges usually complete one generation each year, and grow and mate with mature larvae in summer and winter. In the spring of the following year, when the jointing of wheat took place, the larvae began to extend from the inside of the pupa and rose to a depth of 3 cm - 7 cm. Adults emerged from late April to early May, mated and spawned on the wheat ears. The egg period is about 5 days. The larvae invade into the spikelet after hatching to injure, sucking the slurry in the young wheat grain causes the grain to open empty and severely reduce production. The larvae are about 20 days old and mature after being cooked by wheat, and they stick out of the wheat ears on the rain or when they are wet. They shoot off the ground and enter the 10 centimeters to 14 centimeters circle to start the summer. The occurrence of wheat red midge has the following obvious characteristics: 1. Several key periods occur in line with certain growth periods of wheat. For example, when the adult emergence period is often wheat “exposedâ€, the larvae incubate and invade frequently, and the larvae are often infested. Cooked ear into the soil is often in milk maturity. 2. The hydatid insects are afraid of dryness and sensitive to moisture. Larger soil moisture content is the culmination of larvae and adult eclosion and emergence of adult eclosion. Therefore, midpigs occur more severely along river basins and irrigated land. In spring, with more than 20% soil moisture content, it is beneficial to larvae and adult eclosion. Mist and dew are also conducive to adult spawning and larval infestation. The amount of production is large; on the contrary, March --- 4 The month was dry with little rain and the soil was hardened. The larvae are no longer phlegm-remaining, and remain dormant for many years in the soil. As early as in the early days, they are rarely emerged. The ability of wheat midge to break out mainly depends on the number of insects, climate and soil conditions, and planting area of ​​susceptible cultivars. In recent years, due to the increase of multiple cropping index, reduction in the number of ploughing, and improvement of water conservancy conditions, favorable conditions have been provided for the survival of midge insects and field reproduction. The density of worm populations has been increasing year by year. In spring, with more rain, higher soil moisture can promote the emergence of midge insects, but the spring drought is less Soil moisture content is insufficient, and the midge will be retained in the soil, gradually accumulating and emerging as a result of eclosion, which will cause hidden dangers for the subsequent occurrence of catastrophic events. Insect-like cultivars have the characteristics of tight clasping, long flowering, and thin grain, etc., It is conducive to the invasion, feeding, and survival of the larvae of the sucker, and the continuous planting can make the midge breed rapidly and spread into disasters. The prevention and control of wheat midge should be based on the principles of agricultural control and chemical prevention. Agricultural control is mainly the selection of insect-resistant varieties, the next round of boring, ploughing exposure, control of spring irrigation, topdressing. There are three suitable chemical control periods, namely sowing site preparation, larval pupa and adult emergence. When sowing land preparation, the combination of the density of the midge pests in the plots combined with the control of pests, 20% lindane or 3% methyl salicylate or phoxim, phorate granules 2 kg per mu, or 40% A Basic people willow phosphorus emulsion, 50% phoxim emulsion 150 grams --- 200 grams of water, mix 25 kilograms of toxic soil, spread evenly after the application of soil treatment. When the larvae rise in the middle of April and the surface of the larvae in mid-April, if more than 5 insects per side can be used to spread the ridge between the ridges of the above-mentioned toxic soil, and timely cultivator watering after spreading, the control effect can reach more than 90%. When Mai “shows his faceâ€, when he or she pulls one or two heads of adult insects with middlings, he or she should be prevented and treated immediately. Each mus of lindane can be used with 4- or 50% phoxim, 40% omethoate, 80% of dichlorvos EC 50 ml of water to 50 kg --- 60 kg of spray, or 4% of the enemy horse powder, 2% carbaryl powder 1,5 kg --- 2 kg of dusting, have good control effect.
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