Dry rot of sweet potato is one of the main diseases of sweet potato during storage, and it can infect at the beginning of harvest and during the whole storage period. Symptoms are spots with round or irregular depressions on the tubers, irregular shrinkage of the potato peels, pale brown, and depression of the lesions. In severe cases, the rot of the tubers is dry and rot. Or both ends of the potato block, the epidermis is brown and there is longitudinal shrinkage. The following measures can be taken to prevent dry rot of sweet potato:
1. Breed disease-free seed potatoes. Choose a rotation field of more than 3 years as a place to stay, cut vines from spring potato fields or plant summer and autumn potatoes from high-cut seedling nursery.
2. Fine harvesting, careful handling, avoiding potato block injuries and reducing the chance of getting sick.
3. Clean the potato pit, disinfect and sterilize. The old cellar should be cleaned, or the walls of the cellar should be shaved, then fumigated with sulphur (15 grams of sulfur per cubic meter). The north can be stored in a large house, and it can be treated at high temperatures during the initial period of entry into the cellar.
4. Use 50% thiophanate-methyl WP wettable powder 500-700 times, or 50% carbendazim wettable powder 500 times before soaking the tuber, and soak the tuber l-2 times. Dry into the pit.
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