In late August of 2003, a canola field near St. Albert had patches of early ripening plants with shriveled seeds and odd roots. This conventional tillage field had been in a wheat – canola rotation since 1997. Field inspections by at least two different pathologists indicated that 90% of the field was infested with clubroot disease. A survey of 70 fields in the Edmonton area that fall found 13 clubroot infested fields. At that time clubroot was not isolated to a single field or area but it had NOT spread to most canola fields in that area. The dry conditions of 2004 kept clubroot in check, with no new infestations reported. Then in the following three years, clubroot began to spread relentlessly. By 2007, clubroot had been found in 11 counties.
Download the PDF file for the full paper from the Agronomy Update 2008 conference proceedings