Abstract
IN many seasons the kromnek disease causes heavy losses in both tobacco and tomato in the Cape Province and Transvaal. Its virus origin was first diagnosed1 in the Kat River area of the eastern Cape Province, and it has since been identified with the spotted wilt disease now well known in many parts of the world. In the Kat River area it is transmitted mainly, if not entirely, by the feeding of a thrips (Frankliniella schultzei Trybom) which has a wide host range among both wild and cultivated plants.2The virus likewise attacks a very great variety of plants3 and the control of the disease is therefore a very difficult problem which has not so far been solved for South Africa.
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References
Moore, E. S., Science Bull. 123, Dept. Agric. Union of South Africa (1933).
Moore, E. S., and Anderssen, E. E., Science Bull. 182, Dept. Agric. Union of South Africa (1939).
Hean, A. F., ‘Kromnek in South Africa”, Farming in South Africa (October 1940).
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MOORE, E. Control of the Kromnek (Spotted Wilt) Disease of Tomatoes. Nature 147, 480–481 (1941). https://doi.org/10.1038/147480b0
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DOI: https://doi.org/10.1038/147480b0
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