Good control of wheat field red spiders before winter

Red spiders in wheat fields are frequent pests, which damage wheat from the seedling stage. Overwintering as adults, nymphs, and eggs on wheat tillers and soil blocks. Its ability to withstand the cold is extremely strong, and when the temperature reaches over 8°C in the following spring, it reproduces and damages it. Generally, the plots with early sowing, unwatered before and after sowing and rough land preparation will be heavier before winter. In recent years, due to the high temperature in autumn, it can reproduce in wheat fields for 1 to 2 generations before overwintering, causing serious damage to wheat seedlings. The damaged wheat leaves show small white spots, then turn yellow, the leaf tips are dry, and the tillers are reduced. It looks like a drought and defertilization, which is easy to cause negligence. If no control is carried out before winter, it will affect the safe overwintering of wheat seedlings and increase the damage in the following spring. Therefore, if we do a good job of prevention and control before winter, we can get the effect of "killing a thousand".

Grasping agricultural control and prevention of wheat field red spiders should be based on agricultural control. Combined with farming prevention and control, no additional prevention and control costs are required, no natural enemies are killed, no environmental pollution, and it is beneficial to the production of pollution-free agricultural products. Agricultural control measures are diversified, and can continuously control the population of plant diseases and insect pests, and can play a cumulative control effect. (1) Eliminate insect sources. A large number of red spider insects and eggs are parasitized on wild wheat seedlings, wild oats and the surrounding weeds in wheat fields. The timely eradication of these weeds for field treatment can prevent their transfer to the wheat seedlings. (2) Cultivation and pest control. Because the eggs of red spiders are mostly laid on the soil, the intertillage can not only protect moisture and prevent drought, increase the ground temperature, promote the healthy growth of wheat seedlings, but also break the soil, causing the eggs to be smashed and buried in the soil to suffocate, exposing the ground surface. Frozen eggs in winter can greatly reduce the hatching rate. (3) Watering and killing insects. Aiming at the pseudo-death of the spider mites, watering combined with artificial rope vibration method, buried it in the soil and suffocated to death. (4) Suppress and exterminate insects. Red spiders are clustered. In the late autumn and early winter seasons, they climb up the wheat seedlings at 9 am and cause the most damage from 3 to 4 pm. Suppression at this time can not only protect moisture and prevent drought, but also have a good effect of controlling growth. . Combined with the suppression of shaking wheat seedlings, a large number of red spiders can be pressed into the soil to smother.

Do a good job in chemical control on the basis of agricultural control, if the control targets are still reached, chemical control should be carried out in a timely manner. Sampling surveys at 5 points before chemical control. Each survey point is 33 cm long and a row of wheat ridges. When the average number of red spider worms and nymphs reaches more than 200 at 5 points, the prevention and control indicators are reached and spraying should be done immediately. You can choose 1.5% dimethoate powder or 2% methyl isofenphos powder, spraying 1.5-2.5 kg per mu; or according to the above-mentioned pesticide dosage, mix 15-20 kg of fine soil per mu, and spray along the wheat ridge. Or spray with 50% phoxim emulsion 1500 times, or 75% gmite EC 2000 times, or 1.8% abamectin EC 2000 times, or 5% fenpropathrin 3000 times spray, spray per mu The liquid medicine is 50 to 70 kg. The effect of spraying at 3 to 4 pm is the best, and the pesticides should be sprayed carefully without leaving dead ends. Investigate after 10 days of application. If the control target is still reached, control can be performed again. Add 100 grams of potassium dihydrogen phosphate or urea to the medicinal solution used per acre, and spray it after mixing it evenly, which can improve the control effect and significantly increase the yield.

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