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      Glyphosate-resistant Palmer amaranth (Amaranthus palmeri) confirmed in Georgia

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          Abstract

          A glyphosate-resistant Palmer amaranth biotype was confirmed in central Georgia. In the field, glyphosate applied to 5- to 13-cm-tall Palmer amaranth at three times the normal use rate of 0.84 kg ae ha−1 controlled this biotype only 17%. The biotype was controlled 82% by glyphosate at 12 times the normal use rate. In the greenhouse, I 50 values (rate necessary for 50% inhibition) for visual control and shoot fresh weight, expressed as percentage of the nontreated, were 8 and 6.2 times greater, respectively, with the resistant biotype compared with a known glyphosate-susceptible biotype. Glyphosate absorption and translocation and the number of chromosomes did not differ between biotypes. Shikimate was detected in leaf tissue of the susceptible biotype treated with glyphosate but not in the resistant biotype.

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          Investigations into glyphosate-resistant horseweed (Conyza canadensis): retention, uptake, translocation, and metabolism

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            Growth analysis of fourAmaranthusspecies

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              Interference of Palmer amaranth in corn

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                Author and article information

                Journal
                applab
                Weed Science
                Weed sci.
                Weed Science Society
                0043-1745
                1550-2759
                August 2006
                January 2017
                : 54
                : 04
                : 620-626
                Article
                10.1614/WS-06-001R.1
                afbe1979-5cbc-4d43-80a1-e74f1d2f4128
                © 2006
                History

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