Abstract
Gibberella ear rot (GER) is a fungal disease of increasing concern to maize production in southern Brazil. A 2-year field experiment was conducted to evaluate GER resistance in 14 hybrids inoculated with a Fusarium meridionale isolate using the silk-channel and the pin inoculation method. Two disease-related variables, GER severity and Fusarium-infected kernel (FIK), and plot yield were assessed. Significant hybrid x inoculation method interaction was found for GER severity (P < 0.0001), FIK (P < 0.0001), and yield (P = 0.0328). No significant correlation was observed between all pair of variables for both methods. GER resistance varied among hybrids; most were classified as moderately susceptible based on the pin inoculation method (11/14) and the silk-channel method (8/14). No maize hybrid was completely resistant, which confirms the challenges of using host plant resistance for GER control.
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