Wheat midge adopts mature larvae to survive in winter in deep soil and can sleep for many years. In the spring, when the soil temperature at 10 cm rises to about 7°C, that is, wheat breaks and starts to move to the surface of the soil during the jointing stage of wheat. In mid-April, As the wheat enters the booting stage, the larvae successively make earthworms in the 3 cm topsoil. The general period of 8 to 12 days. In late April, the adult eclosion first occurs on the surface of the earth and then spawns on the wheat ears. This occurs at the time of wheat heading to flowering and the egg period of 3 to 7 days. The hatched larvae penetrate into the glume of the wheat hull, bite into the epidermis of the wheat, and suck on the grout that is being grouted, causing pods and empty shells. The midge insects are also named. Since the bug is very small, the hazard is very subtle, and it is not known until the wheat harvest can produce food.
In view of the fact that wheat midge only harms ear grains at the ear of wheat and the larvae, cockroaches and adults of wheat midge before wheat heading are all concentrated on the characteristics of the surface or surface activity of the soil, we can adopt the propellant soil during booting stage, heading and leaf spraying during flowering period. Methods to control the midge.
Disposal of medicinal soil can be done with 5% phoxim granules 2 kg per mu or 2.5% methyl isofluosa granules 1.5 kg plus fine sand 20 kg, or 50% phoxim EC 200 ml, 5 kg watered , 5% chlorpyrifos granules 600 to 900 grams per acre, preparation of wet sand soil 25 to 30 kilograms, no dew at noon into the wheat fields, and then use bamboo or string vibrating wheat strains, so that the soil completely fall on the surface. Combined with irrigation, the effect is better.
Heading control insects can be sprayed with 5% acetamiprid WP 2000 times, 80% DDVP 1000 times or 10% imidacloprid WP 1500-2000 times, and various pyrethroids, such as 4.5% efficient Cypermethrin 1500 times, or organic phosphorus and pyrethroid compound such as 25% chlorpyrifos emulsion 1500 times. Attention must be paid to observing the progress of the development of specific plots of wheat, controlling 2 to 3 times before the wheat “breaks†until flowering. At the same time, pay attention to matching the amount of water and spray evenly. Choose as much as possible after dusk or after the afternoon temperature drops.
It is recommended that in areas where winter wheat worms have been found to be overwhelming in winter, measures to prevent and control the spreading of medicinal soil from the heading stage will be adopted, and they will continue for several years and remain under the rule of general defense. There is no plot of soil to be used for pesticides. Adult eclosion and oviposition time should be monitored closely. Based on how much time it takes to overlap with the heading stage of wheat to prevent and control adult worms, or to adopt the concept of prevention and protection of the panicle, it is necessary to control adult worms at the earliest stage. Just as in some areas, the corresponding agents can also be mixed.
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