67-10 Control of Glyphosate Resistant Palmer Amaranth in Soybean.

Poster Number 159

See more from this Division: C03 Crop Ecology, Management & Quality
See more from this Session: C03 Graduate Student Poster Competition
Monday, November 1, 2010
Long Beach Convention Center, Exhibit Hall BC, Lower Level
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Amro Ahmed and David Holshouser, Virginia Tech, Suffolk, VA
Glyphosate resistant Palmer amaranth (Amaranthus palmeri) has been confirmed in 9 southern states; therefore, aggressive weed management programs are needed.  Herbicide efficacy experiments were established in 2009 and 2010 in a field heavily infested with Palmer amaranth to determine effective control programs in soybean.  In 2009, glyphosate applied at 0.84 kg a.e. ha-1 at 1 week after planting (WAP), 0.84 kg a.e. ha-1 at 3 WAP, and 1.68 kg a.e. ha-1 at 5 WAP provided only 80% season-long control.  Glyphosate applied after preemergence herbicides improved control with glyphosate up to 90%.  In Liberty Link® soybean, glufosinate applied 0.45 kg ha-1 at 1 and 3 WAP or applied at 0.45 kg ha-1 following a preemergence herbicide provided greater than 95% control.  The most effective conventional weed control programs resulted in greater than 90% control of Palmer amaranth.  The 2010 data will be presented at the conference.
See more from this Division: C03 Crop Ecology, Management & Quality
See more from this Session: C03 Graduate Student Poster Competition