How to control sweet potato black spot disease:
1. Reasonable rotation, deep-turning the soil before planting, using disinfectant for the whole garden to effectively reduce the residual bacteria in the field.
2. After the potato seedlings are planted, a new high-fat film should be sprayed to protect the bacteria from infection and increase the survival rate.
3. Timely cultivating, weeding, topdressing, spraying the fruit and strengthening the body to increase the absorption and absorption of sweet potato, accelerate the expansion of underground tubers and enhance disease resistance.
4. In the early stage of the occurrence of sweet potato black spot disease, the targeted agent should be sprayed in time to kill, every 7-10 days, even spraying 3-4 times, can effectively prevent and control black spot disease, with the new high fat film 800 times liquid Mixed use to transform high-toxic pesticides into poisoning, poisoning pesticides are low-toxic, low-toxic pesticides are slightly toxic. Control the volatile and volatile pesticides, prevent the rainwater from scouring, reduce the dosage per acre (half), and improve the control effect (multiple times).
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