Shoot blight first appeared wilting disease cut stems, tubers vascular browning Humidity, portions disease often produce red mycelium white to pink. Initially there was a green spot between the veins of the young leaves and then the necrosis in the green zone. Diseased leaves was bronze, wilting, and dried hanging in the stems do not fall off.
The bacteria overwinters with mycelia in the soil or on diseased diseased potatoes. The conidia produced in the diseased part of the year are transmitted through rain or irrigation water and infiltrated from the wound. The humidity in the field is high, the soil temperature is higher than 28 degrees or it is easy to develop on low-lying land.
Pollution-free control technology:
1, rotation, and grass crops or green manure and other four-year rotation.
2. Scientific management chooses sweet potato to keep seed, apply organic fertilizer, and strengthen water and fertilizer management to reduce the incidence.
3, chemical control, if necessary, watering 12.5% ​​synergistic carbendazim solution 300 times.
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