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Occurrence of Mycoplasmalike Bodies in Phloem of Stubborn-Infected Citrus Seedlings. E. C. K. Igwegbe, Research Assistant, Department of Plant Pathology, University of California, Riverside 92502; E. C. Calavan, Professor of Plant Pathology, Department of Plant Pathology, University of California, Riverside 92502. Phytopathology 60:1525-1526. DOI: 10.1094/Phyto-60-1525.

Pleomorphic, sometimes filamentous, mycoplasmalike bodies, 50-500 mµ diam, with a trilaminar unit membrane, were found in phloem of leaves from stubborn-infected but not in phloem of healthy, sweet orange seedlings. We suggest that stubborn of citrus may be caused by a mycoplasmalike pathogen rather than by a virus.