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Spraying for cutworms continues in parts of Saskatchewan and Alberta. Reports of cutworms are most common in fields that were cultivated last summer (summer fallow or pasture and hay land that was renovated) and had loose soil present for the adults to lay eggs. Cutworms may be at an advanced stage of development and close to pupation. When larvae are small (12 – 18 mm), they pose the greatest potential for damage as they still need to feed and grow. Larvae are near pupating when they are 30 – 35 mm long and when cut open their gullet lacks green material. If no food is found, chemical control will be less effective since a significant portion of control is achieved when treated plant material is ingested.
More information on cutworms is available at:
https://canola-council.merchantsecure.com/canola_resources/product22.aspx