Twelve Amaranth species are listed as resistant to herbicides on the International Survey of Herbicide  Resistant weeds (www.weedscience.org , 2014) comprising 41% (172) of all reported cases and these involve 9 different sites of action.  Only 4 of these species, A. hybridus, A. palmeri, A. retroflexus, and A. turberculatus account for 146 of these cases and 22 of these involve multiple herbicide resistance.  Together with the high rate of seed production and the significant crop competition the Amaranthus sp. complex is one of the most serious weeds in row crop agriculture. The resistance  of A. palmeri and A. tuberculatus to glyphosate has seriously complicated weed management in glyphosate tolerant crops.  The innovation of BioDirect� with the topical application of oligonucleotides targeting herbicide resistant genes offers promise for the management of the Amaranthus sp.  Examples of controlling glyphosate resistant A. palmeri and A. tuberculatus as well as improving other herbicides on these species will be presented.

BioDirect<sup>TM</sup>  and managing herbicide resistant <i>Amaranth sp</i>

248th National Meeting (2014)

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BioDirectTM and managing herbicide resistant Amaranth sp

BioDirect^TM and managing herbicide resistant Amaranth sp