Journal
CROP PROTECTION
Volume 29, Issue 12, Pages 1542-1544Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cropro.2010.07.018
Keywords
Asclepias syriaca; Weed distribution; Glyphosate resistant crops; Corn; Soybean
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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. (C) 2010 Elsevier Ltd. All rights reserved.
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