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Water soaking of leaves in relation to development of the blackfire disease of tobacco



Water soaking of leaves in relation to development of the blackfire disease of tobacco



Jour Agric Res 55(12): 883-889



Tobacco leaves are readily infected by Bact. angulatum, but under ordinary conditions invasion is limited to small areas. The lesions are usually 1/8 inch or less in diarn., and large numbers of infections cause but little damage to most types of tobacco. It had been suggested that the large, quickly developing lesions characteristic of epidemic blackfire were nonparasitic in nature; it is now shown that they are caused by Bact. angulatum, but only under special conditions. The resistance of the leaf to invasion must first be broken down by water soaking, which in turn results from severe storms. Even after leaves are water soaked, and infection has occurred, the development of the disease is abruptly checked if the water-soaked condition disappears within a few hrs. Epidemic disease development was repeatedly obtained by water soaking the leaves for 48 hrs. High topping and low-N and high-potash fertilization increase leaf resistance to water soaking, and these measures are recommended as practicable means of reducing loss from blackfire in the flue-cured tobacco area.

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Accession: 026094185

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