In recent years, many farmers’ friends have reported that sweet potatoes are growing well. Many can be harvested when they are hollow, and some have small black spots on them. They have lost a lot but cannot find a reason. They do not know how to prevent them.
Sweet potato hollow and dark spots are caused by stem nematode disease and black spot disease. It can be used to immerse the roots of the potato seedlings in 50 kg of fresh water before the sweet potato is grown. The control effect is very obvious. In recent years, the author used this method to add cow manure as a base fertilizer. The yield of Beijing 553 and Jishu No. 4 sweet potato was more than 5,000 kilograms, and stem nematode and black spot had never occurred.
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