Turnip Mosaic Virus Strains in Cruciferous Hosts in Taiwan. S. K. Green, Associate Plant Pathologist, Asian Vegetable Research and Development Center, P.O. Box 42, Shanhua, Tainan 741, Taiwan, ROC. T. C. Deng, Principal Research Assistant, Asian Vegetable Research and Development Center, P.O. Box 42, Shanhua, Tainan 741, Taiwan, ROC. Plant Dis. 69:28-31. Accepted for publication 4 June 1984. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-28.

An islandwide survey of the major vegetable production areas of Taiwan was conducted to determine the presence, distribution, and prevalence of strains of turnip mosaic virus (TuMV) affecting Chinese cabbage (Brassica campestris subsp. pekinensis), radish (Raphanus sativus), and smooth-leaf mustard (B. juncea). In addition to the four strains of the virus described in the United States, a fifth strain (TuMV-C5) was found that is capable of systemically infecting the multiresistant Chinese cabbage PI 418957. The physical and serological properties of strain C5 were indistinguishable from the other strains except for its low absorbance values in enzyme-linked immunosorbent assay. TuMV-C4 appeared to be the most widespread strain, followed in decreasing prevalence by C2, C3, C5, and C1. Resistance to TuMV-C5, as well as to the other four strains, was found in plants of the Chinese cabbage line AVRDC Acc. 730.