The Southwest Diagnostic Day program provides seed, fertilizer and chemical industry personnel and agricultural consultants with training in the diagnosis of crop problems and education in advancements in crop production. It was held at University of Guelph, Ridgetown Campus on July 8 and 9, 2015 which was the 21th anniversary of this outstanding technology transfer program. Organized by the Ontario Ministry of Agriculture and Food and Ministry of Rural Affairs the day is designed specifically to hone the problem solving skills of agribusiness representatives through “hands-on" activities related to the correct identification and treatment of crop problems common to southern Ontario. The goal of the Diagnostic Days program is to provide quality training in all aspects of crop production and management. Certified Crop Advisors who participated were able to obtain 5.5 CEU credits.