Journal or Publishing Institution: Crop Protection
Study: https://www.sciencedirect.com/science/article/abs/pii/S0261219410002152
Author(s): Hartzler, R.G.
Article Type: Peer Reviewed Study
Abstract:
The role of common milkweed in the lifecycle of the monarch butterfly has increased interest in the presence of this weed in the north central United States. An initial survey conducted in 1999 found that low densities of common milkweed occurred in approximately 50% of Iowa corn and soybean fields. In 2009, common milkweed was present in only 8% of surveyed fields, and the area within infested fields occupied by common milkweed was reduced by approximately 90% compared to 1999. The widespread adoption of glyphosate resistant corn and soybean cultivars and the reliance on post-emergence applications of glyphosate for weed control in crop fields likely has contributed to the decline in common milkweed in agricultural fields.
Keywords: Asclepias syriaca, Weed distribution, Glyphosate resistant crops, Corn, Soybean
Citation:
Hartzler, R.G., 2010. Reduction in common milkweed (Asclepias syriaca) occurrence in Iowa cropland from 1999 to 2009. Crop Protection, 29(12), pp.1542-1544.
Record ID: 2773
