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Ministry of Agriculture, Food and Rural Affairs

Sweet Corn Pest Activity in Ontario

The periods of pest activity illustrated below are general guidelines based upon both Ontario field experience and pest biology research. The actual period of activity for any given pest will vary significantly from year to year, depending on over-wintering conditions; seasonal temperature accumulation; relative humidity; rainfall; prevailing wind patterns; and other environmental factors.

Click on pest name for more information.


Sweet Corn Scouting Calendar Common Rust Stewart's Wilt Three-Leaf Dieback Bacterial Wilt Northern Corn Leaf Blight Common Smut Wireworm Cutworm European Chaffer Grubs June Bettle Grubs Slugs Common Armyworm Corn Flea Beetle Corn Rootworm European Corn Borer Corn Earworm Corn Leaf Aphids Western Bean Cutworm Fall Armyworm Seed Corn Maggot
Blue Bar Off-peak Pest Activity. The pest may or may not be present at the times indicated. Scouting and other integrated pest management activities performed during the off-peak periods may effectively help to identify and manage pest problems as they begin to develop.
Red Bar Peak Pest Activity. All IPM strategies (scouting, trapping, preventative measures, etc...) should be implemented well in advance of the expected peak activity period. Scouting activities are often intensified during the expected peak periods.