Percent yield reduction in Marco Aurelio and DBC480 due to F. graminearum infection after treating the plants at the spike or flag leaf level with Chitosan at 0.5% (C 0.5%), tebuconazole at 0.06% (T 0.06%), azoxystrobin at 0.08% (A 0.08%), the mixture of tebuconazole at 0.06% and azoxystrobin at 0.08% (T 0.06% + A 0.08%) prior to F. graminearum inoculation; F. graminearum inoculated spikes served as controls (Fg). The data represent averages and standard errors from three independent replicates with at least 10 plants for each experimental group (wheat genotype × compound × mode of application). Different letters (a, b, c, d) refer to the statistical analysis performed using three-way analysis of variance (ANOVA) with the Tukey test at a confidence level of 0.99 and p < 0.01.