Abstract
Maize dwarf mosaic of sorghum, Sorghum bicolor (L.) Moench, is caused by maize dwarf mosaic virus (MDMV). Infection of sorghum by MDMV produces variable symptoms depending on virus strain, plant genotype, and temperature. Infection causes a yellow to dark green pattern (mosaic) and, on certain genotypes, a necrotic reaction (red-leaf) develops when the temperature drops below 21°C (69°F). Hybrids expressing the mosaic reaction when the temperature drops show less reduction in yield than plants with redleaf symptoms. Immunity to MDMV is not present in commercially available hybrid sorghums.
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