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One is to select disease-free plots to keep seedings, prevent potato chips from getting into the pit, and keep seedlings grown from seedling nurseries to keep seeding rarely sick, and cannot use spring potatoes and seedlings or hotpot seedlings to plant seeds. Flooded plots should not be kept. The second is to harvest in time to prevent freezing damage from outside the cellar. If it is chilled in the field, it will rot before storage (about 20 days into the pit). Harvesting seed potatoes is best started in mid-October and finished before the frost falls. The weather was picked in the warm and sunny weather and entered into the pit in the afternoon of the same day. After drying at noon, it was able to lighten the skin. If you cannot enter the pit on the same day, you must pay attention to cover frost protection. If you leave the field exposed to frost, remove the frozen potato chips that are exposed on the ground.
The third is to implement "four light" to prevent breakage. The wound is the gateway to the infection of the bacteria. To prevent breakage, the planer should be lightly planed, lightly loaded, lightly transported, and gently placed. The broken potato pieces should be removed strictly and put directly into the pit for storage.
Fourth, leave enough space to prevent infection. The number of seeds retained is generally 60 kg for each acre of spring potato. Single cellar or single pile, can not be mixed with edible sweet potato, different species should also be stored separately.
Some aspects of virus-free sweet potato seeding
Virus-free sweet potato seeds are more carefully stored than ordinary potatoes. Pay attention to the following four points: