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1972•International Organization of Citrus Virologists Conference Proceedings (1957-2010)Open access

A Decline of Citrus on Trifoliate Orange Rootstock Associated with Tristeza Virus

Arnoldo R. Pujol, R. E. Schwarz, M. V. Fernández Valiela, D. S. Rodriguez

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Abstract

SEVERELY DECLINED trees of sweet orange on Troyer citrange rootstock were discovered near Santa Paula in Ventura County, California, in 1961, indexed, and found to be infected with tristeza virus.Numerous trees of the same combination were declining by 1964 on several properties in Orange and Ventura counties.Symptoms of the disease and preliminary evidence for its probable identity with tristeza have been published (2, 6).We report here the results of studies to determine the relationship of tristeza virus infection to the decline of sweet orange/Troyer citrange trees. MethodsPeriodic surveys were begun in 1964 to determine the incidence of decline in sweet orange/Troyer cit-

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SEVERELY DECLINED trees of sweet orange on Troyer citrange rootstock were discovered near Santa Paula in Ventura County, California, in 1961, indexed, and found to be infected with tristeza virus.Numerous trees of the same combination were declining by 1964 on several properties in Orange and Ventura counties.Symptoms of the disease and preliminary evidence for its probable identity with tristeza have been published (2, 6).We report here the results of studies to determine the relationship of tristeza virus infection to the decline of sweet orange/Troyer citrange trees. MethodsPeriodic surveys were begun in 1964 to determine the incidence of decline in sweet orange/Troyer cit-

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Available abstract

SEVERELY DECLINED trees of sweet orange on Troyer citrange rootstock were discovered near Santa Paula in Ventura County, California, in 1961, indexed, and found to be infected with tristeza virus.Numerous trees of the same combination were declining by 1964 on several properties in Orange and Ventura counties.Symptoms of the disease and preliminary evidence for its probable identity with tristeza have been published (2, 6).We report here the results of studies to determine the relationship of tristeza virus infection to the decline of sweet orange/Troyer citrange trees. MethodsPeriodic surveys were begun in 1964 to determine the incidence of decline in sweet orange/Troyer cit-

Key concepts: Trifoliate orange, Citrus tristeza virus, Rootstock, Orange (colour), Closterovirus, Biology, Virology, Horticulture

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