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The article examined the influence of three inoculum sources on the development of fusarium head blight (FHB) and the deoxynivalenol content (DON) in spring wheat in a disease nursery in Ottawa, Ontario. The progress of FHB was monitored by visually estimating disease severity during each growing season and its symptoms were also rated, at a critical development stage, as critical-time disease severity, percentage of infected spikelets and FHB index.