Potato ring rot is a bacterial disease that usually occurs in cold areas. Pathogens cannot survive in the soil for a long time, usually in the seed. The transmission route is through a knife or a bag, or through aphids. Other insects spread when sucking the leaves of the juice.

Potato ring rot is a vascular bundle disease. The general infection is in the late stage of the potato growth period. Under suitable conditions, the pathogens first propagate rapidly on the diseased species, and then gradually move through the nutrient and water transport. Propagation spreads on vascular bundles and branches, and finally infects roots and new potato tubers.

After the potato was infected with the ring rot, the top leaves began to show signs of morbidity. When the temperature was high during the day, the leaves drooped and returned to normal sooner or later. In the later stages, it was completely dead. The seriously diseased potato plants have short leaves and cannot grow and develop. Individual species have spotted leaves in the onset of the disease, then spread upwards and eventually die. The diseased plants were pulled up, and the light potato chips appeared normal. The severe potato pieces began to sag from the umbilicus and there was pus out. Cut the potato pieces, you can see a yellow circle of necrotic tissue under the epidermis of the potato tube, and there is a serious yellow pus viscous liquid. Cross-cut or slit stalks can be seen in necrotic vascular bundles.

Control methods: First, strengthen the field management, try to reduce the soil temperature, prevent infection of the diseased plants, and remove the damaged plants in time. The second is to kill the pathogen with 25kg of talcum powder and about 250g of agricultural streptomycin per 1000kg of seed, and then sow. The third is to promote the cultivation of small whole potatoes. The fourth is the disinfection of the cutter, and the cutter is disinfected by using one thousandth of potassium permanganate solution during cutting. The fifth is to establish a disease-free breeding base for breeding and breeding.

The above are some of the symptoms and prevention methods of potato ring rot, for your reference, I hope to be helpful to everyone.

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