[U of A University of Arkansas Division of Agriculture]
[Title Slide - Pigweed and Reducing Seedbanks, August 2011. Your Arkansas Soybean
Podcast, University of Arkansas Division of Agriculture, Arkansas Soybean
Promotion Board Harvesting the Potential.]
[Video shows Dr. Robert C. Scott, Extension Weed Scientist standing in a soybean field
Today I’d like to discuss the control of glyphosate-resistant Palmer pigweed
or Palmer amaranth in soybeans. Once palmer amaranth has reached this size and
glyphosate and other control measures have failed, there are no chemical control
options to control pigweed at this size.
The conventional herbicide, Flexstar, which contains the active ingredient
fomesafen, is effective in controlling glyphosate resistant Palmer pigweed.
However it’s only effective if sprayed when these pigweeds are two the three
inches tall. [Dr. Scott standing in a soybean field with pigweeds. Flexstar (fomesafen)
is effective at controlling glyphosate resistant Palmeri Pigweed but only at
heights of less than 3 inches. ]
In a salvage situation which we have here, we end up killing some of the
pigweed. Other pigweeds may have the top burned out with some pretty severe
necrosis. However, most of these pigweed will continue to produce seed in this
So in those where we need to stay in soybeans following the occurrence of
glyphosate-resistant pigweed, we can rotate to LibertyLink soybeans. LibertyLink
soybeans will tolerate the herbicide Ignite. Ignite can provide an effective
control option for glyphosate resistant pigweeds. [Dr. Scott standing in a soybean field
with pigweeds. LibertyLink soybeans will tolerate the herbicide Ignite. Ignite
can provide an effective control option for glyphosate resistant Palmeri
[Dr. Scott] See the MP 44 or contact your local county agent for the best
recommendations for using Ignite in LibertyLink beans.
[Narrator] Your Arkansas Soybean Podcast is a production of the University of
Arkansas Division of Agriculture and was funded in part by the Arkansas Soybean
Promotion Board. For more information about soybean farming in Arkansas, contact
your local county Extension office.
[Title slide - Arkansas Cooperative Extension Service. various pictures of
people, crops and farming equipment]