Sweet potato root knot nematodes, most of the black inside the potato block dry rot, crooked heart, epidermis, black halo, some cracks, and some potato crust and good potato is no different, but the internal has been dry and grief. Sweet potato after infection has reduced yield and deteriorated quality. The disease was introduced from the field by seedlings, and the nematodes infiltrated my land with the transportation of the seedlings and became infected. Therefore, it is recommended that sweet potato growers must pay attention when planting, to prevent the impact of root-knot nematode disease and affect planting income. First, the law of occurrence Sweet potato root nematode disease commonly known as rickets, is a disease caused by nematodes. The disease is spread by diseased potatoes, diseased seedlings, and diseased soils. Flowing water and tools can also spread diseases. Loose soils and even lands are most suitable for the growth and development of nematodes, and thus the incidence is heavier. On the contrary, the incidence of soil compaction and rotation plots is lighter. Second, prevention and control measures In addition to preventing nematodes from spreading with seeded potatoes and seedlings, implementation of 3 to 4 years of rotation, pay attention to chemical control, before sweet potato breeding, seed potatoes with 1500 times abamectin soak 2 to 3 minutes to eliminate The remaining nematode on the seed potato, or after inserting the potato seed, is sprayed on the seedbed with 1500 times avermectin. When planting mash, use 1500 times avermectin + 500 times 50% carbendazim liquid burrowing, 100 ml per hole, cover the soil after watering. Before and after dipping potatoes, spray 1500-fold avermectin again. shockwave therapy,electromagnetic therapy machine,shock therapy machine,light wave therapy machine,electromagnetic wave therapy Shenzhen Guangyang Zhongkang Technology Co., Ltd , https://www.lighttherapymachine.com