Reduction in common milkweed (Asclepias syriaca) occurrence in Iowa cropland from 1999 to 2009

Date
2010-12-01
Authors
Hartzler, Robert
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Agronomy
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Agronomy
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.

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NOTICE: this is the author’s version of a work that was accepted for publication in Crop Protection. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Crop Protection, [29, 12, (2010)] doi:10.1016/ j.cropro.2010.07.018.

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