Research Publications of Interest (not comprehensive)

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Milkweed
R. G. Hartzler and Buhler, D. D., “Occurrence of common milkweed (Asclepias syriaca) in cropland and adjacent areas.”, Crop Protection, vol. 19, pp. 363-366, 2000.
R. G. Hartzler, “Reduction in common milkweed (Asclepias syriaca) occurrence in Iowa cropland from 1999 to 2009.”, Crop Production, vol. 29, pp. 1542-1544, 2010.
Monarch
R. G. Hartzler and Buhler, D. D., “Occurrence of common milkweed (Asclepias syriaca) in cropland and adjacent areas.”, Crop Protection, vol. 19, pp. 363-366, 2000.