There are three different European corn borer (ECB) areas in southwestern Ontario – a 1-generation (univoltine) area, a 2-generation (bivoltine) area, and an overlap area that has both univoltine and bivoltine populations (Baute, 1999). Degree Days (DD) are heat accumulations using a base temperature (i.e. a minimum temperature required for development). A DD model was validated to predict flight patterns of ECB in southwestern Ontario (Baute, 1999). This model gives us an idea when ECB flight begins, peaks and ends based on moth captures and can be used to guide scouting efforts and management decisions. Below are the estimated accumulated DD for ECB in some regions of southwestern Ontario.
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