Clubroot DNA found in Manitoba
By Manitoba Government
Mar. 1, 2013, Winnipeg, MB - Soil samples taken from six fields in Manitoba have been confirmed through polymerase chain reaction (PCR) analysis to contain clubroot DNA.
Further tests done under ideal greenhouse conditions indicate that two of the six soil samples produced weak clubroot gall symptoms on highly susceptible plants. These test results are considered positive cases of clubroot, with viable spores able to produce disease. Positive results in the PCR test only are considered 'non-symptomatic fields of concern'.
In 2011, two soil samples were identified as non-symptomatic fields of concern, but retesting in spring 2012 resulted in negative PCR results. All fields previously identified will be monitored, with additional soil samples tested in 2013.
Since 2009, 566 canola crops have been surveyed and 321 soil samples have been analyzed for clubroot DNA in Manitoba.
For more information, visit http://www.gov.mb.ca/agriculture/crops/diseases/fac72s00.html.