Spring drought pays attention to control wheat aphids

From wheat emergence, to heading grouting, and milk ripening, wheat bran can cause harm. In autumn, the temperature dropped. After the wheat seedlings were unearthed, the winged mites moved into the wheat field. The affected stems and leaves were yellow spots at first, and gradually expanded into streaks. In severe cases, the whole leaves were yellow and even the whole plant died. Wheat bran has strong cold tolerance, and it can still harm wheat seedlings in sunny and warm weather in winter. After the spring, the temperature rises, and the overwintering insects multiply, first in the lower leaves, leaf sheaths and heart leaves. After heading, they are mostly concentrated in the ear damage, resulting in an increase in empty mites and a decrease in 1000-grain weight, which seriously affects wheat yield.

The medicinal control of wheat bran should start from the seedling stage. Generally, when the temperature in the seedling stage is high, the drought is low, and there are 5% of the plants, when there are 10% of the stalks in the jointing stage, when the stalks are 15% to 20% after the gestation, the application should be controlled. The medicine can be selected from one of the following:

(1) 40% dimethoate emulsion 1500 times solution or 80% dichlorvos EC 200 times liquid spray.

(2) 50% methamidophos 25 g spray with water 60 kg.

(3) 2.5% deltamethrin or 20% fast-killing, 10 ml per acre with 50 kg of water spray, the best effect when the temperature is low in winter and spring.

(4) Take 500 grams of tobacco leaves, soak 25 kg of water for 24 hours, take another 500 grams of lime and add 5 kg of water to mix and filter, then mix the tobacco leaf soaking solution with lime filtrate.

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