Weeds to Watch - 7
Emily Unglesbee DTN Staff Reporter
Thu Feb 27, 2014 06:50 AM CST

The South has been ground zero for herbicide-resistant weeds and Palmer amaranth is public enemy No. 1. Glyphosate-resistant populations of what Southern farmers often call pigweed have plagued cotton and soybean crops, at times to the point of total loss.

"We found our first glyphosate-resistant Palmer amaranth in northeast Arkansas in 2006," recalled Jason Norsworthy, University of Arkansas weed scientist. "I did a survey in 2011 and 87% of the cotton fields in the state of Arkansas had glyphosate-resistant Palmer amaranth and 61% of the soybean fields. If you look at our acreage, that equates to about 2 1/2 million ...

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