The sweet potato clams are "not long dead"

In recent years, farmers often report that the cultivated sweet potato seedlings are yellowed and shrivelled after they are inserted into the ground. The growth of plants is very slow, and the spoken language in rural areas is “not long dead”. This yam has basically no yield in the later period. After investigation, the main reason was that the sweet potato virus disease was serious.

Sweet potato virus disease is one of the common diseases of sweet potato. The disease begins from the seedling stage of sweet potato, and the incidence of regenerating potato seedlings after cutting is more serious. The typical symptoms of diseased seedlings were: leaf yellowing, shrinkage, mosaic, leaf rolling, stem vines fine, growth potential was significantly weaker. After the diseased potato seedlings were planted in Daejeon, their growth was weak and the yield was low. Generally, the reduction rate was 60% or more.

The internal cause of the occurrence of sweet potato virus disease is that the seed potatoes carry viruses, and the external cause is poor climate and cultivation conditions. Therefore, to prevent and treat sweet potato mosaic virus disease, it is necessary to make efforts both inside and outside: first, update the improved varieties and switch to the use of virus-free, virus-resistant (or poison-tolerant) sweet potato varieties. Second, the virus-free sweet potato seedlings were planted separately, planted separately, harvested individually, and stored individually; during the growth period of sweet potatoes, it was necessary to strengthen the control of insect pests such as aphids and whiteflies that could spread the virus of sweet potato, and to prevent reinfection of virus-free seed potatoes. virus. Third, the farmers who have not changed the improved varieties must choose the healthy seedlings for seedlings; the mosaic seedlings are found during the seedling raising process, and the entire planting potatoes are removed in time; the healthy potato seedlings are selected for planting; and the diseased seedlings are removed after being inserted into the field. . Fourth, through precision soil preparation, high ridge cultivation, increasing potash fertilizer, balanced fertilization, watering drought, grass mulch and other agricultural measures, improve cultivation management techniques, and enhance the resistance of sweet potatoes. The fifth is to treat sweet potato seed potatoes and seedlings with antibiological agent “En Yi Bi”, and to use “Virus A”, “Virus King”, “Ji Du Qing”, “83 Additives”, “Virus Ning”, "Virus Bike" and other leaf sprays on the potato seedlings to do adjuvant treatment, to enhance the growth of potato seedlings, reduce symptoms of viral diseases, inhibit the incidence, increase production has a certain effect.

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