Early detection and treatment of wheat red spider
At present, with the increase of temperature, wheat spider mites will generally occur in the wheat fields in the city, and attention should be paid to early prevention and control.
Wheat spider mites are commonly known as dragons, red spiders, and spiders. According to the survey, the red spider that damages wheat in our city has wheat leg spiders and wheat spiders. The two spiders are characterized by small body size, early occurrence, and rapid propagation. The general adult body length is 0.6-0.85 mm and width is 0.2-0.65 mm. Both of them are clustered and feign death. They all rely on crawling and wind spreading to spread damage. Therefore, the phenomenon that the first spot occurs and then spreads to the whole field often appears in the field. Both adults and nymphs of the two spiders sucked leaf juice with a sucking mouthpart, first damaging the lower leaf of wheat, and then spread gradually to the middle and upper parts. Yellow-white spots initially appeared on the victim's leaves. Afterwards, red spiders increased and red patches appeared on the leaves. Some or all of the affected leaves curled up and became yellow or red-brown. The wheat was infertile, the plants were short, the grains were small, and the seed setting rate was reduced. , The yield dropped, and the whole plant was dry when severe.
The prevention and control of wheat spider mites in spring is the first priority for field monitoring surveys. Surveys will be conducted every 5 days after the return of green wheat. When a single row of wheat ridges grows to an average of 200 heads or 6 insects per plant, most of the leaves are covered with white spots. , should be promptly controlled. The second is that the plots with water pouring conditions can be watered and disinfested, and the wheat strains are swept before the irrigation to make the red spider fall to the ground and then the water is released, so that the insect body is stuck to the surface and die. The third is to carry out chemical prevention and treatment. The effect of spraying wheat is best at noon in the jointing stage of wheat, and the agent can be sprayed with 15% Bailing EC 1000 times or 1.8% avermectin EC 1000-1500 times.
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