Differentiation of Sugarcane, Maize Dwarf, Johnsongrass, and Sorghum Mosaic Viruses Based on Reactions of Oat and Some Sorghum Cultivars

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Abstract
Different virus strains, formerly called sugarcane mosaic virus (SCMV) and maize dwarf mosiac virus (MDMV), were studied under the same experimental conditions. The objective was to determine if a differential set of oat and 11 sorghum cultivars would distinguish among the four viruses in the new taxonomic system now classified as SCMV, MDMV, johnsongrass mosaic virus (JGMV), and sorghum mosaic virus (SrMV). Fifteen well-characterized strains of these four were used in this study. These viruses are separable based on symptom expression in sorghum and oat. JGMV alone infects oat. Strains within MDMV and JGMV react uniformly in sorghum. SCMV strains differ in reactions on some sorghum cultivars. SrMV strains differ on two sorghum cultivars. These infectivity results clearly support the new taxonomy suggesting that, although helpful, it is not essential to have biochemical and serological laboratory capabilities to classify these 15 virus strains.