Abstract
Abstract Diseases caused by viruses and mycoplasmalike organisms are among the most serious citrus production problems. Mycoplasmas are, of course, much larger than viruses and contain both RNA and DNA. Many are obligate parasites, but some are not (54, 55). From a horticultural point of view, mycoplasmalike diseases of citrus are much like virus diseases. The first citrus disease shown to be caused by a virus was psorosis in 1933 (32). About 20 virus and viruslike diseases of citrus are recognized now (53, 55, 56); to cite an exact number is difficult because, like taxonomists, citrus virologists disagree on which diseases should be lumped together and which should be considered separately. Recent summaries of citrus virus research have been published (7, 54, 55, 56, 80, 89, 126). Table 1 summarizes the more important virus and viruslike diseases of citrus.
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