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Photographs can be a valuable diagnostic tool, but they have to be in focus, taken from various angles and come with details on field conditions and location…
Diseases other
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Diseases are usually easiest to see and diagnose at this stage of the season. The photo shows blackleg in a clipped canola stem. Patches of dying or prematurely-ripening plants are obvious areas to scout (and show up really well with drone images), but even clean-looking fields can provide some early warning if you take time to look… -
These can be hard to tell apart sometimes. Pinched or otherwise damaged-looking stems can occur with all three. The photo shows blackleg infection. Here’s how to tell them apart… -
Disease scouting long after swathing is not usually the most accurate, as saprophytic organisms — those that feed on and break down dead material — move in fast and cloud the identification process. Verticillium is one disease that can be more obvious and easier to identify after cutting a canola crop… -
Harvest is a great time to assess the incidence and severity of canola diseases, an important step in management for next year…
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With blackleg, sclerotinia stem rot and clubroot, base the swath timing decision on healthy plants that will contribute to yield. One exception where early swathing could provide an economic benefit is the case of severe alternaria black spot (shown)… -
Check patches of pre-mature ripened canola to identify the cause. It could be blackleg, clubroot, sclerotinia stem rot (pictured) or something else entirely. Here’s how to identify the major diseases of canola as fields get close to swathing stage…
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Patches that seem to be maturing early while the rest of the crop is still green do warrant closer inspection. With all the rainfall in some areas, die-off due to excess moisture could be the prime suspect — but check anyway. It could be disease…
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Learn to tell the difference between common lesion-causing diseases — blackleg, sclerotinia stem rot and alternaria black spot…
