Download a free copy of the Adobe Acrobat Reader. Infection of sorghum by each virus initially results in a mosaic leaf symptom.
Hybrids expressing the red-leaf symptom show greater reduction in yield.
Therefore, inoculation of sorghum hybrids with these viruses will identify those having only the mosaic reaction and, thus, less yield loss and also may indicate which viruses are causing the symptoms. Sorghum seed was lanted in 6.1 m rows. Symptom notes were recorded at biweekly intervals during the growing season beginning 2 weeks after inoculation. Planting was delayed until late June to assure cool temperatures for induction of red-leaf necrosis. Results Field symptoms of hybrids are shown in Table 1.