Abstract
Maize dwarf mosaic (MDM) is a virus disease of maize (Zea mays L.) that causes yield reductions. The objective of this study was to determine yield losses caused by maized warm fosaic virus strain A (MDMV‐A) in susceptible maize hybrids grown over a wide range of environmental conditions. Plants inoculated with MDMV‐A were compared with noninoculated plants in the years 1981 to 1984 at various locations within the USA. Inoculation levels were 100% in 1981; 33, 67, and 100% in 1982; and 50 and 100% of the plants in 1983 and 1984. The regressions of grain yields (expressed as a percentage of the noninoculated check) on MDM‐diseased plants were calculated. Linear regressions best explained the results, and deviations from linearity were not statistically significant. The b values ranged from 0.118 to 0.445 for different location and year combinations. The linear regression that best described the results over all environments and hybrids was Y = 99.7 − 0.242x where Y = predicted yield (as a percentage of the noninoculated check) and x = percentage of diseased plants. Thus, maized warm fosaic virus decreased yields by an average of 2.4% for each 10% increase in MDM‐diseased plants. This certainly emphasizes the need to grow hybrids that are resistant to this virus.
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