The midge occurs one generation in a year, with the mature larvae entering the soil and wintering on the surface at 2-20 cm. Overwintering occurs. During the middle and early March of the following year, the wheat breaks up and rises. In early April, when wheat spikes, the larvae that rise to the surface of the soil start to develop. In mid-April, when wheat starts heading, it emerges as an adult and spawns on the wheat ear. In early May, when wheat is groated, eggs hatch as larvae, and the larvae live in wheat husks for 15-20 days of aging and in grains. The development of three instars is completed. When the wheat matures, the mature larvae enter the soil and complete one generation.
For wheat midge, we should focus on spraying wheat during jointing stage to booting stage on the basis of soil treatment during the wheat sowing period. When the adult emergence period is about 70% of wheat heading, the spraying treatment is applied.
In the flood season, prevention and control are based on the investigation of the progress of wheat midge development and focus on prevention and control in the flood season. At present, it is the favorable period for flood control. Where there are more than 2 plots per square meter, use 3% phoxim granules 2.5-3 kg or 50% phoxim EC per acre. 30 kg of soil was blended and distributed in Shunmai ridge in mid-April to kill larvae that rose to the surface. After spraying the soil and watering the soil or cultivating the insects to control the emergence of insects, it can simultaneously treat various insect pests such as wheat maggots and wheat spiders.
Adult stage prevention and treatment If missed the favorable opportunity of flood control, it can be treated in the adult stage. The application period is April 20-25. Apply 40 milliliters of 4.5% cypermethrin EC per acre and spray 40 kg of water to treat both wheat aphid, armyworm and wheat leaf bee. It can also be combined with disease prevention and spraying to control midgeworms. Each mus of sprayed liquid is added with 30 grams of wolfberry fruit or 20% of triadimefone EC 75-100 ml, which can also be used to treat rust, powdery mildew and leaf blight.
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