Investigation Confirms Case Of Glyphosate-Resistant Palmer Pigweed In Georgia

15-Sep-2005

Dr. Stanley Culpepper, a University of Georgia weed scientist, and Monsanto have determined that Palmer amaranth (Palmer pigweed) at specific sites in central Georgia is resistant to glyphosate, the active ingredient in Monsanto's Roundup® agricultural herbicides. Numerous field and greenhouse trials completed earlier this year indicated probable resistance; however, heritability studies - to determine whether the lack of control is passed on to the next generation - are now complete and confirm this Palmer amaranth population as resistant.

The resistant population infests 500 acres of Roundup Ready® cotton in central Georgia. Additional herbicide products have provided effective control of the resistant population. Dr. Culpepper and Monsanto are surveying the surrounding area this season to determine if this biotype has spread. When glyphosate resistant weed biotypes have been identified in the past, they have been effectively managed with other herbicides and/or cultural practices, such as tillage.

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