PPO-Resistance in US<BR>First identified in US in 2002 <BR>tall waterhemp (Illinois) <BR>24 reported cases <BR>4 weed species <BR>tall waterhemp, Palmer amaranth, common ragweed, goosegrass <BR>1 recently confirmed case in GA<BR>Source: Heap, I. The International Herbicide-Resistant Weed Database. Online. Friday, December 3, 2021 . Available www.weedscience.org Copyright © 1993- 2021 WeedScience.org All rights reserved. <BR>