Submitted to: Phytopathology
Publication Type: Abstract only
Publication Acceptance Date: 3/15/2004
Publication Date: 6/1/2004
Citation: Brlansky, R.H., Roy, A., Damsteegt, V.D. 2004. Aphid transmission of stem pitting citrus tristeza virus from mixed virus infections. Phytopathology 94:S10. Interpretive Summary:
Technical Abstract: Citrus tristeza virus (CTV), a phloem-limited closterovirus, contains a single-stranded, 20- kb RNA. Numerous isolates of the virus exist which produce a variety of symptoms in various citrus hosts. One of these symptoms is stem pitting (SP). SP does not occur in all citrus hosts but may cause low tree vigor, decline and an economic reduction in fruit size and yield. Historically, the first appearance of CTV-SP follows the introduction of the efficient CTV vector, Toxoptera citricida. Hypotheses for this association range from the introduction of these strains in new planting materials to the increased ability of T. citricida to selectively vector SP strains from existing CTV mixtures. CTV exists as a complex of isolates or subisolates and T. citricida has been shown to separate the complex. A study was initiated to determine what T. citricida transmits when a severe SP CTV isolate is mixed with a non-SP isolate from Florida. Biological and molecular data were generated from grafted mixtures and aphid transmissions from these mixtures showed that the stem pitting CTV was predominant.