Abstract
IN 1957 a virus-induced vein yellowing disease was found in four Eustis limequat (Citrus aurantifolia (Christm.) Swing, × Fortunella japonica (Thunb.) Swing.) trees in California1. Although the virus has been shown experimentally to have a wide host range within the citrus family, it has not been found to occur naturally in other limequat trees or any other citrus plants. Cross-protection examination revealed that although the yellow vein virus will interact in various ways with certain of the other citrus viruses, it is not related to them2,3. This communication presents evidence of the existence of strains of the yellow vein virus based on cross-protection tests and studies of the synergistic interaction between yellow vein and vein enation viruses.
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