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al. 1990). The present study was conducted to determine the optimal time for application ofpropiconazole on spring wheat to control S. nodorumand other foliar diseases in order to achieve maximum yield benefit in the Outlook irrigation area of Saskatchewan. All tests were carried out at the Irrigation Development Centre, Outlook, Saskatchewan on land which grew wheat for at least the previous two years. In the spring, 100 kg ha-l of 34-0-0 fertilizer was broadcast before seeding.During the growing season, water was applied when tensiometer readings measured -0.6 bar. A split-plot design with four replications was used, with the hard red spring wheat cultivar, Katepwa, and the soft white spring wheat cultivar,