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Simultaneous Infections of Citrus Leaves with Tristeza Virus and Mycoplasmalike Organism. Ming- hsiung Chen, Plant Pathology Laboratory, Faculty of Agriculture, Nagoya University, Nagoya; T. Miyakawa(2), and C. Matsui(3). (2)(3)Horticultural Experiment Station, Katsuura, Tokushima, Japan. Phytopathology 62:663-666. Accepted for publication 25 January 1972. DOI: 10.1094/Phyto-62-663.

Likubin-diseased citrus trees in orchards are frequently affected by both the Likubin pathogen and tristeza virus. Electron microscopy of Likubin-diseased Tankan leaves revealed the occurrence of both pathogens. Mycoplasmalike organisms and tristeza virus particles were restricted to phloem tissue cells. Within the phloem tissues, the pathogens were encountered both in widely separated or in adjacent cells. Cells rarely contained both pathogens. No intimate association of the pathogens was observed.