Three measures to improve the control effect of wheat aphid
Wheat aphid is one of the main pests harming@#@245@#@at present. In recent years, wheat aphids have become more and more serious due to the change of climatic conditions, the decrease of natural enemies and the improper control measures in wheat fields, resulting in the decrease of wheat yield and quality. In view of the situation of wheat aphid control by farmers, the following three measures can be taken to improve the control effect of wheat aphid.
According to the control index, 500 aphids per 100 ears was the control index for wheat aphids. As long as the control index is reached, the plot should be treated immediately. According to the control index, not only the damage of wheat aphid to wheat can be effectively controlled, but also the purpose of saving medicine and labor can be achieved. Do not wait until wheat aphids are full of wheat ears before starting control, otherwise the control effect will be affected due to late control.
Alternate application reduces resistance of wheat aphids Common use of a pesticide can make wheat aphids resistant to the pesticide used, thus making the control effect worse. It is suggested to apply 40g of 21% chloraz, 25g of 2.5% cis-cypermethrin, or 50ml of 3% acetamiprid EC per mu at the initial stage of aphid occurrence, and 8- 10g of 50% pirimicarb WP or 20- 30g of 10% imidacloprid WP at the middle and late stages of aphid occurrence. The above pesticides have special effects on aphids and are basically harmless to aphids natural enemies. Alternate use can obviously improve the control effect.
Appropriate increase in water consumption Some farmers do not use scientific water, such as the control of wheat aphid in 1 mu of land in the pesticide added to 1 sprayer water (a mist filled with about 15 kg of water) for control, the result of the liquid medicine can not be evenly sprayed on all plants in the wheat field, resulting in no or less pesticide plants continue to survive and reproduce, resulting in secondary harm. The water consumption should be appropriately increased in combination with the pesticide application equipment. The water consumption per mu should not be less than 50 kg with manual sprayer, 40 kg with electric backpack sprayer, and 20 kg with mobile mist sprayer. Spray evenly from top to bottom to ensure the control effect.
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Introduction of two new combinations of early brilliant rice with high yield, medium maturity and high quality
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(1) Life habits: the body of rice thrips is very small, and the length of adults is only 1 mm-1 mm and 5 mm, dark brown. In winter, adults overwinter in Gramineae weeds and wheat crops. During the self-rearing period of the next year, when the seedlings grow to 2-3 leaves, they fly into the seedling field to lay eggs and reproduce. The worm is small, very active, and can fly and jump. The adults tend to be green, and the seedlings are rich in food at the tillering stage after transplanting, which is conducive to mass spawning and harmful to heart leaves and young tissues. At the initial stage of the damage, the leaves showed small white spots, and the upper part of the leaf tip was curled inside, making
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