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Incidence of virus detection in vegetatively propagated plant introductions under quarantine in the United States, 1957-1967



Incidence of virus detection in vegetatively propagated plant introductions under quarantine in the United States, 1957-1967



Plant Dis Report 51(9): 715-719



Sixty-two percent of 1277 plant introductions imported as vegetative propagations indexed positive for one or more viruses. The incidence of virus detection in Citrus, Ipomoea, Prunus, Solanum, and Vitis species was respectively 67, 10, 56, 62, and 75. Since symptom expression in the introductions was only about 10 to 25%, the incidence of latent infection was, therefore, relatively high. As a result of indexing a large number of introductions covering a wide spectrum of plants, there was probably at least a 50% chance of introducing virus-infected plants in vegetative propagations of old-line varieties or new varieties or breeding lines grown in the field at nonisolated sites for several growing seasons. The significance of these results in terms of the cost of conducting virus-indexing tests and maintaining quarantine is discussed.

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Accession: 014517164

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