First, it is forbidden to introduce root rot, melasma and nematodes in the main diseases of the northern sweet potato from the affected area. The sweet potato pests and diseases in the south include yams and ant tusks, and they must be banned from introduction in the wards. After inspection by the phytosanitary department, it is determined that any of the above sources will not be taken to prevent the introduction of diseases into the region. It is not blind to the introduction of varieties that require the variety and source of the disease.
Second, pay attention to the quality of seed potatoes, sweet potato and non-virus-free sweet potatoes and virus-free different levels of seed potatoes or seedlings are difficult to distinguish in appearance, so you must understand and learn how to identify true and false virus-free sweet potato at the time of purchase. The scientific method of identification is virus detection, but it requires specialized technicians and necessary medicines, instruments and facilities. The simplest method of identification is to see if the seed potato provider has the necessary conditions to propagate the corresponding grade seed potatoes. You should go to the sweet potato breeding unit or the sweet potato breeding site for introduction. It is also necessary to pay attention to the timely update of seed potatoes. After two generations of seed potato propagation, the yield increase effect is not obvious, and it needs to be replaced.
Third, the selection of suitable varieties for the local cultivation of any fine varieties must be under appropriate conditions to play its role in increasing production. When introducing, we must fully understand the characteristics of the varieties, and then select suitable varieties according to the purpose and local climate, soil, and disease occurrence. The varieties seen from advertising information should be clearly informed about the breeding units, sources, and adaptability of the varieties, and the results of national, provincial and municipal tests and disease resistance appraisal tests, as well as the advantages and disadvantages. Not resistant to disease. If it is an uncertified new variety with outstanding advantages, it may be introduced in small quantities and not introduced in large quantities.
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