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Figure 1. Location of 2017 corn rootworm beetle (CRW) monitoring fields by crop (top) and characterization of 2017 sampled fields by present crop and
previous crop with average maximum daily captures for western (WCR) and northern (NCR) CRW beetles (bottom).
Figure 2. (Top Left) Corn rootworm (CRW) beetle monitoring locations for 2017 categorized by peak beetle counts observed during sampling and (Right) peak
beetle emergence frequency categories (beetles/trap/day) observed in 2017 CRW monitoring fields by crop and rotation.
Figure 3. 2017 Interpolated peak beetle captures across the Corn Belt in corn (Top Left) and in soybean (Top Right). Comparison of 2016 (Bottom Left) and
2017 (Bottom Right) CRW beetle captures in corn. (Circled areas represent similar areas of higher CRW populations in 2016 and 2017).
Categories for CRW beetle counts are based on action thresholds (beetles/trap/day) suggested by Extension entomologists at the Universities of Illinois and Iowa State and provide economic damage (ED) potential for the following season.1,2
2017 CRW Beetle Survey Data (Figure 2, Left and Right).
Comparison of 2016 vs. 2017 CRW Beetle Data (Figure 3, Bottom).
1 Western corn rootworm. Diabrotica virgiferavirgifera LeConte. Extension & Outreach. Department of Crop Sciences. University of Illinois.
2 Hodgson, E. and Gassmann, A. 2016. Guidelines for using sticky traps to assess corn rootworm activity. Integrated Crop Management. Iowa State University.
3 Evaluating corn rootworm risk and economic impact. 2017. Agronomic Spotlight. Monsanto Company. Websites verified 11/9/17. 171106192900