Wheat larvae are world-wide pests and are widely distributed in major wheat-growing countries in Asia, Europe and the Americas. The domestic wheat larvae are also widely distributed in the main wheat producing areas of the country. There are two main types of wheat larvae in China, namely, red larvae and yellow larvae. Wheat red-sucking worms mainly occur on the banks of the river in the plains, while the yellow-sucking worms mainly occur in plateaus and high mountains.
Control method
Agricultural control
(1) Selection of insect-resistant varieties
The midwifery is resistant to low temperatures and not to high temperatures, so the winter mortality rate is lower than the summer mortality rate. The soil moisture condition is an important factor for the wintering larvae to start activities, and is a necessary condition for the growth and emergence of the larvae. Different wheat varieties, wheat larvae have different degrees of pests and diseases . Generally, the awns are long and thorny, the tight ears are dense, the flowering period is short and tidy, and the varieties with thick rind are unfavorable for the spawning, larval invasion and damage of the adult larvae.
Therefore, it is necessary to use a wheat variety in which the shape of the ear is tight, the inner and outer pilose are long and dense, the wheat grain is thick, and the slurry is not easy to flow out.
(2) Rotation
Wheat fields have been turned over in recent years, and wheat and rapeseed, beans, cotton and rice crop rotations have a significant effect on the number of insects. In the severe field of wheat midge, and cotton and wheat intercropping or replanting crops such as rapeseed and garlic, it will be mitigated after planting wheat after the rainy year.
2. Chemical control
(1) Soil treatment
Time: 1 before wheat planting, the last shallow tillage; 2 wheat jointing stage; 3 wheat booting stage.
Pesticides : 2% methyl isoflavin powder, 4.5% methyl ester powder, 4% enemy horse powder, 1.5% methyl 1605 powder, 2 to 3 kg per mu, or 80% dichlorvos EC 50-100 ml plus water 1 to 2 In kilograms, or use 200 ml of 50% phoxim emulsifiable concentrate, add 5 kg of water to spray on 20 to 25 kg of fine soil, mix well and make it into toxic soil, and plow it and pour it into the soil.
(2) Adult disease control
Before heading from wheat to flowering, use 80% dichlorvos per acre, 150 ml, add 4 kg of water to dilute, spray on 25 kg of wheat bran and mix well, and sprinkle a pile per mu. This method has a long residual effect and good control effect. Or use 40% dimethoate emulsion 1000 times; 2.5% deltamethrin 3000 times; 40% killing pine WP 1500 times solution.
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