Diffusion of wheat varieties in three agro-climatic zones of western Canada

Diffusion patterns of all major bread wheat varieties released in western C anada over the period 1950-92 are analyzed. Agronomic, quality and disease attributes of each variety are examined to explain diffusion patterns. It i s found that the pattern of diffusion is affected most by yield, days to ma turity, test weight lodging and bunt. The relative importance of these attr ibutes varies somewhat by agroclimatic region within the prairie provinces.