The Agronomists, Ep 125: Late-season disease assessments with Johanna Lindeboom and Doug Moisey

Pre-harvest is an excellent time to scout soybean and canola for various disease levels and to assess how the season has gone. There’s also plenty to be learned at harvest and even after harvest, depending on what you’re looking for.

To tackle the stories stems tell and what to do about it, host Lyndsey Smith is joined by Johanna Lindeboom of Clark Agri-Service, and Doug Moisey with Corteva, on this week’s episode of The Agronomists.

This episode of The Agronomists is brought to you by ADAMA Canada, Corteva Enlist E3, and RealAg Shops!


  • It’s been a “fun” year for diseases
  • Crop is all over the map stage wise…across the country
  • Smoke certainly played a role in what was going on this year. It caused crops to mature at a much slower rate
  • Stagey canola became a big nightmare for a lot of people trying to determine swath timing. Some people ended up leaving for straight cutting that maybe wouldn’t have normally straight cut
  • White mould control and soybean canopy closure — there was some researching surrounding it that seemed to really make sense this year
  • There was a lot of premature death in canola fields this year that was misidentified as blackleg. It turned out to be verticillium, which really is there across the prairies

CLIP 1: Canola School: Plant stand counts and post-harvest disease scouting

  • Oh the tales that a canola stem can tell
  • As water moves, the bacteria moves
  • Phytophthora root rot and drowning out of the soybeans looked the same. A telltale with phytophthora is dark reddish lesions
  • Drowning out is not necessarily root rot. Soybean plants can’t survive underwater
  • Sudden death syndrome — how do I know if it’s what I’ve got? Check out the episode for some terrific visuals
  • Blackleg can come in at the 1-2 leaf stage. It really depends what else has impacted the crop
  • Submit samples to labs, and ask them to identify the different races
  • At swath timing, it’s a schlerotina club root scout
  • You can actually lots of time catch clubroot at early flower when it’s aggressive
  • The races are continuously changing with clubroot, and becoming much easier
  • Scouting at swath timing for canola can tell us a lot about what we maybe missed, however, it also can show us what things we did well on
  • It’s years like this in Ontario that you’re going to want to pay attention to pod and stem blight in soybeans
  • When it comes to sending off samples for different things — how difficult or easy is it to send to different labs?
  • You have to ask the right questions of the labs. I.e., how many strains do you test for?
  • Take notes! You may think you can remember everything now when you are out in the field, but when it comes to planning for next year, we really want to know what happened in that field
  • When considering rotations for next year, pay attention to what diseases you’ve had in previously years
  • Monitor those “bad” areas of the field that have been impacted by diseases
  • Figure out what those numbers and letters mean in the variety you are looking at in terms of your fields so you know what you are protecting your crop from
  • There’s quantitative resistance, and there’s seedling plant resistance — which is qualitative

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