Comprehensive Prevention and Control Techniques of Diseases and Insect Pests of Sweetpotato (Polygonatum sinensis) during Seedling and Transplanting Period

Sweet potato is one of the important crops in our province, and it is about to reach the sweet potato seedling stage. Sweet potato breeding period and transplanting stage are the key period for comprehensive prevention and control of sweet potato diseases and insect pests. It is necessary to do comprehensive prevention and control of pests and diseases in sweet potato breeding period and transplanting period. First, the main targets for the prevention and control of seedlings during nursery period are black spot disease and stem nematode disease. The following main measures should be taken: 1. Selection of seed resistant and virus-free varieties Currently, compared with the resistant varieties of melon black spot, there are Xushu 18 and Lushu 3, 4, 5, and 6 etc., and the virus-free potato species have yield. Good quality and other advantages can be selected according to local conditions. 2. To cultivate disease-free potato seedlings, disease-free new seedbeds should be used, and non-disease-free potato species should be selected. Black potato spot, stem nematode disease, injuried and frozen potato should be excluded for seedling nursery. 3. Do a good job in soaking and spraying pesticides. It is possible to use 40% methylisophos- phate 1000 times and 40% carbendazim 800-1000 times or 50% methyl mop cloth 1500 times. Use the old seedbed, but also put in new soil and spray the seedbed with the above mixture. Second, the main objects of the control of transplanting stage are black spot of sweet potato, stem nematode and underground pests. The main measures that should be taken are as follows: The first step is to leave the seedbed to a height of 3 cm for high-cutting seedlings to prevent black spot and nematode disease in the seedlings. The second is to use seedlings to deal with seedlings, 50% carbendazim or 40% methyl mop Tianjin and 40% methyl isoflurophosphate 1000 times mixed liquid infusion seedlings. The third is the recurrence of stem nematode disease, can be used 5% stem thread Ling or 5% methyl isofluosaphos granules per acre 1 ~ 1.5 kg soil treatment seedlings point control. The fourth is the re-emergence of underground pests, which can be treated with 1% trichlorfon wheat bran baits ranging from 3 to 4 kg per mu.

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