Sweet potato hollow disease, also known as cockroach heart disease, is caused by sweet potato stem nematodes. The disease spreads quickly and is of great danger. It occurs in some areas of our province and it is important to pay attention to early prevention and treatment. Methods as below:
1. Use resistant varieties. Choose disease-resistant and virus-free varieties suitable for local planting. For example, Jinshu No. 10, Beijing 553, Yushu No. 13, Sushu No. 8, etc.
2. Cultivate disease-free strong seedlings. Before the seedbed is used, it must be strictly sterilized and sterilized, and bed soil should be renewed to avoid transmission of diseases. Seeds of potato can be killed by soaking seeds in warm water of 52°C-53°C for 10 minutes before killing seedlings to kill disease-free strong seedlings.
3 pharmaceutical extracts of potato seedlings. When picking the seedlings, cut the roots of the seedlings by 3-5 cm to remove more stem nematodes from the base of the seedlings. Then use a kit of imported thiophanate methyl bromide for 50 kg of fresh water to mix and soak the roots of the potato seedlings for 5 minutes and then colonize.
4. The rotation is down. Serious disease plots should be rotated. Sweet potatoes and wheat, corn, millet, cotton, and tobacco rotate with each other, and they do not grow sweet potatoes for more than three years. They can basically control the damage of stem nematodes.
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