Ring Rot of Potato and its Control
Ring rot is caused by Corynebacterium ring rot (Corynebacteriumsepedonicum), which can occur in stems and leaves or in tubers. It can continue to cause damage during storage and cause tuber rot in severe cases. In recent years, with the popularization and application of virus-free seed potato, the incidence of ring rot decreased significantly.
1. Symptoms
Ring rot is also a vascular bundle disease. Aboveground symptoms generally appear after flowering. The initial symptoms appeared in the lower leaves of the plant, showing chlorosis between the veins, mottled and wilting. After that, the veins gradually turned yellow and withered, and the leaf margin turned yellow and curled up. Due to the different environmental conditions and variety resistance, the plant symptoms are also different. One symptom is that the plant is dwarfed, thin, less branched, the leaves are small and yellow, the wilting symptom is not obvious, and generally does not appear until the later stage of growth; the other is acute wilting, the leaves are gray-green and curl inward, die early, the vascular ring at the base of the stem changes color, and the bacterial liquid can be squeezed out in severe cases.
The typical symptom of tuber infection is discoloration along the vascular bundle ring in the cross section and decay in severe cases. In the early stage of the disease, there were no symptoms on the tuber surface, and the skin color darkened or browned with the development of the disease, and the bacterial fluid overflowed in the cross section when the disease was serious.
2. Prevention and control methods
Comprehensive measures are mainly taken for prevention and control. The establishment of disease-free breeding base, the use of virus-free original seeds for seed potato reproduction; whole potato sowing to eliminate the spread of bacteria in cut pieces; sprouting and sowing to eliminate diseased seed potatoes in time.
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Potato ring rot
The disease is a bacterial vascular bundle disease, which is characterized by dwarf and wilting of aboveground stems and leaves and annular rot of underground tubers along the vascular bundle ring. The early and severe disease leads to the death of seedlings; most of the diseased plants grow slowly, dwarf and thin, few branches, small leaves, and wrinkle but not spread; if the disease is late and light, the plant height, leaves and branches grow normally, but the top leaves become smaller. In the later stage, the first or second branches or the whole plant wilted. The symptoms are most obvious after flowering, the lower leaves wilt, droop and die at first, and the upper leaves curl inward from the edge, showing dehydration, turning grayish green, and then
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Techniques of Potato Ring Rot
It is a common disease with an area of about 10% all the year round. Potato ring rot pathogen is mainly transmitted by seed potato, it can not survive in the soil, but can be carried on tools, machinery, packing boxes and bags. Solution: using disease-free seed potato is the most economical and effective control method; sowing whole potato; cutting pieces of seed potato should be strictly sterilized; before sowing disease-free potato pieces, it is necessary to eliminate autogenous plants in the field. and use baskets, boxes and other tools for disinfection; use new bags.
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