“…In the late 1990s, R populations were found in the Sacramento Valley of California (Fischer et al, 2000a). R plants exhibited resistance to at least nine herbicides from seven different chemical groups: sulfonylurea, triazolopyrimidine, pyrimidinyl carboxy herbicides, aryloxyphenoxypropionate, thiocarbamate, quinclorac, and clomazone (Fischer et al, 2000b;Osuna et al, 2002;Ruiz-Santaella et al, 2006;Bakkali et al, 2007;Yasuor et al, 2009Yasuor et al, , 2010Yasuor et al, , 2012. Today, there seems to be only one herbicide left to control this weed in California (Yasuor et al, 2012).…”