vfem
Garden Addicted
http://www.cals.ncsu.edu/agcomm/new...ntinues-on-managing-the-weed-palmer-amaranth/
Roundup-resistant weeds, like the voracious Palmer amaranth, have left growers with few tools to keep weeds out of their fields. In some cases, these resistant weeds are so invasive they even cut into crop yields. N.C. State weed scientist Dr. Alan York estimates that about half of all Palmer amaranth populations in eastern North Carolina are resistant to glysophate, and about half show resistance to another class of herbicides, ALS (acetolactate sythase) inhibitors. A quarter of all Palmer is believed to be resistant to both types of herbicides.