Abstract
The effects of systemic infection by Peronosclerospora philippinensis and P. sorghi (both downy mildew fungi) and maize streak virus (MSV) on host reaction and pathogen reproduction were quantified in two maize cultivars. The maize cultivars tested (DeKalb XL 43A and Pioneer 3369A) were susceptible to all pathogens. Infection by MSV masked symptoms of downy mildew infection. Reduction in height and biomass were significantly greater with pathogen combinations than with single pathogens. Systemic infection by either downy mildew fungus had no effect on MSV titer. Infection by MSV reduced plant biomass, leaf area, and total sporulation of either fungus; however, sporulation per unit leaf area was not affected
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