College of Agricultural Sciences

S. E. Wortman, Davis, A. S., Schutte, B. J., Lindquist, J. L., Cardina, J., Felix, J., Sprague, C. L., J. Dille, A., Ramirez, A. H. M., Reicks, G., and Clay, S. A., “Local Conditions, Not Regional Gradients, Drive Demographic Variation of Giant Ragweed (Ambrosia trifida) and Common Sunflower (Helianthus annuus) Across Northern U.S. Maize Belt”, Weed Science, vol. 60, no. 03, pp. 440 - 450, 2012.