Planting bitter buckwheat in winter is very easy to be affected by decayed teeth and leeches. It is often clustered on the young leaves of the growing point to suck juice, so that the growing point shrinks, the curly leaves become deformed, the top of the bunch is not formed, and new roots are not produced. The new leaves, the longer the plant, the smaller and the more chlorotic yellowish and withered. It also induces soot disease and transmission of viral diseases, shortens the growth period, and significantly reduces the yield and quality. Therefore, it is necessary to pay attention to the control of aphids and pests in order to protect the growing points and young leaves.
When bitter buckwheat is planted in winter, pay attention to the growth point and tender leaves of bitter leeks, and find that there are a small number of locust or mites on the growth point and young leaves, and when they are slowly crawling, they must be sprayed once. A 1500-fold 50% aqueous pymetrozine solution, or a 1500-fold 20% aqueous thiamethoxam solution, or a 1000-fold 10% aqueous imidacloprid solution, or a 1000-fold 0.5% aqueous solution of veratridine is used for prevention and treatment. In the course of growth and development of tartary buckwheat, if there is growth point atrophy and curly leaf curling, it is necessary to continuously spray 2-3 times with 1000 times 0.5% dimethyl disulfide and 600 times with 0.5% mushroom proteoglycan. Liquid, or 1500 times 2.8% avermectin, 800 times 1.8% octamine acetate mixture, or 1000 times 0.5% phenoxyway, 600 times 5% ninnanmycin mixture, every 10-15 days Spray once to kill locusts and pupae that harm the growing point and young leaves, and also to prevent soy and viral diseases.
When spraying, all the leaves must be sprayed evenly. Pay attention to spraying on the growth point to start dropping drops of water. Within 4 hours after spraying, rainwater was flushed and the spray must be re-applied again to improve the control effect.
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