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Lettuce Big-Vein Virus Transmission by Single-Sporangium Isolates of Olpidium brassicae. M. T. Lin, Department of Plant Pathology, University of California, Davis 95616; R. N. Campbell(2), P. R. Smith(3), and J. H. M. Temmink(4). (2)(3)(4)Department of Plant Pathology, University of California, Davis 95616. Phytopathology 60:1630-1634. Accepted for publication 12 June 1970. DOI: 10.1094/Phyto-60-1630.

Of 18 single-sporangium isolates from a mass culture of Olpidium brassicae that transmitted lettuce big-vein virus (BVV), only 8 were viruliferous. Each of the 10 nonviruliferous isolates was capable of acquiring BVV in vivo and transmitting it. Of 13 additional single-sporangium isolates obtained from a viruliferous single-sporangium isolate, 12 transmitted BVV and the other isolate could acquire BVV in vivo. The over-all results suggest that all Olpidium isolates capable of multiplication in lettuce can acquire and transmit BVV. All attempts to mechanically transmit and characterize BVV failed; thus, the nature of BVV is still uncertain.