Root rots caused by many fungi can also cause leaf wilting, yellowing of leaves, and stunted growth. Wilted, yellowing leaves can be due to environmental factors as well as other diseases, including other strains of R. On intact tubers, soil may stick to ooze around the eyes. A cross section of an infected potato tuber may show a ring of brown discoloration and light pressure may produce an ooze. A sticky or slimy substance containing the bacteria may ooze from freshly cut infected stems, and is especially visible if placed in water. The stem interior becomes discolored and dark streaks may be visible. Infected plants show wilting of part or all of the plant, followed by leaf yellowing then death of the leaf between the veins and stunted growth. In addition to surviving in plant material the bacteria can also persist in soil or planting media as well as irrigation and waste water, and spread to other fields occurs by surface runoff water and infested soil that is moved on equipment. Introduction to a new area occurs through propagative plant material such as infected seed potato tubers and ornamental cuttings. Infections can cause wilting and death of susceptible plants. Ralstonia solanacearum is a bacterium that can infect over 200 different plants, with the Solanaceae (potato family) containing the highest number of susceptible species. Ralstonia solancearum race 3 biovar 2 can be found throughout most of the world including Mexico, but does not occur in the U.S.’ Biology solanacearum race 3 biovar 2 can infect plants in temperate climates. solanacearum occur in tropical or subtropical conditions. solanacearum, only race 1 can be found in the U.S. Ralstonia solanacearum does not occur in Minnesota. and may be required to have documentation certifying their freedom from this pathogen before import is allowed. Imported ornamental plants and cuttings, especially geraniums ( Pelargonium spp.), are considered a significant risk for introducing this bacteria to the U.S. solanacearum race 3 biovar 2 includes members of the Solanaceae family like potato, tomato, and geranium.
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