Soil sample the fall after canola harvest or the spring immediately following. This gives galls time to break down and release spores. If sampling this fall, target fields that are going into canola next year…not fields that were in canola this year…
Diseases
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The fungal pathogen Verticillium longisporum causes stem cross-section discolouration that can look somewhat like blackleg and bleaching of the stem that can look somewhat like sclerotinia stem rot. But these diseases are all quite different in terms of yield risk and management, so it’s important to be able to tell them apart…
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Around 60 per cent seed colour change (swath timing) is the best time to scout for blackleg as the basal cankers, which cause significant yield loss, are easy to see. Check fields – even if growing resistant (R) rated hybrids. An R rating is not immunity and does not tell much about if it will be effective against the races…
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Clear patches of canola plants that are ripening prematurely could be diseased. These are obvious places to start a pre-harvest disease survey…
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Researchers have identified at least 36 clubroot pathotypes in Western Canada, and roughly half are not controlled by the common clubroot resistance source – often referred to as first generation or "gen 1" resistance. That is why hybrids with clubroot resistance (CR) can still have clubroot galls…
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Through the pod filling time between flowering and harvest, growers and agronomists will want to take time for a more intense session of clubroot scouting. But what are you looking for? This quiz will help train your eye…