Diseases that cause the cracking of sweet potato are common in people who suffer from rickets and nematodes. Prevention and control measures: First, use antibiotics for disease resistance. Second, establish a disease-free seeding area and cultivate disease-free strong seedlings. Seed potatoes were sterilized with warm water of 50°C to 54°C for 10 minutes. Third, the implementation of soil disinfection. Use 80% dibromochloropropane 1.5 kg water to 100-150 kg water per mu, or use 70% dibromoethane 2.5 kg water 200-300 kg to prepare the liquid, 20 days before planting Apply pesticide and apply soil immediately. Fourth, rotation for change. It is better to use peanuts for rotation and it can be rotated for one year. Rotation time with corn, sesame, etc. should be longer, preferably 2 to 3 years.
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