Insect update

June 17, 2020 – Issue 14

Flea beetles and slow-growing crop. Seed treatment is likely no longer providing protection if canola has been in the ground since mid May. If canola is growing slowly for whatever reason, a foliar spray may be required if flea beetles are still present and feeding on new growth, and if leaf area loss is above the action threshold (25 per cent leaf area loss). Canola Encyclopedia section on scouting and thresholds.

Cutworms here and there. We have no reports of wide-spread cutworm outbreaks, but look for isolated patches that may benefit from a localized spray. The nominal threshold is of 25 to 30 per cent stand reduction. Canola Encyclopedia section on scouting and thresholds.

Diamondback moth counts by province. Some areas of the Prairies have above-average numbers of adult moths showing up in traps, but spraying at this stage of the season is not recommended. Canola Encyclopedia section on scouting and thresholds. The latest counts by province:

  • Alberta map
  • Saskatchewan: Totals to date (June 10) for Saskatchewan trap sites are 460 at Meadow Lake and 122 at Cadillac. All other are in double or single digits.
  • Manitoba report
Canola Watch