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2. Breeding disease-free strong seedlings. The disease-free plots were used as seedbeds, disease-free plots were used to cultivate seedlings, and disease-free seedlings were selected before seedlings. Black spot, stem nematode disease, injury, and frost damage were strictly excluded. Before growing seedlings, the lumps were soaked in warm water of 52-54°C for 10 minutes to kill viruses, nematodes, etc. that survived the lumps.
3. Pharmaceutical soaking and spraying seed. Use 40% methylisoprophosulfate 1000 times and 40% carbendazim 800-1000 times or 50% thiophanate-methyl 1500 times soaking or spraying seed.
Sweet Potato Seedling Pest Control
1. Establish disease-free fields and select disease-resistant and disease-resistant varieties. We must vigorously develop virus-free sweet potatoes and grow more resistant and disease-resistant varieties. Currently, there are Xuzhou 18 and Lushao 1 and 3, Lushu 6 and 7, and Beijing 553.