Over the past few years, the promotion of foliar fungicides has increased in North America and most of this information has been generated for commercial corn and soybeans. Very little work has been done in Ontario or elsewhere to investigate inbred-specific responses to fungicides; therefore, a multi-year study was started in order to identify factors that would increase the probability a seed corn grower would have in achieving a profit from a fungicide application. Seed Corn Growers in Ontario would benefit from local data to assist in profitable and accurate decisions when it comes to disease management thereby maintaining or increasing the competitiveness of the Ontario seed corn industry.