Nature, Occurrence, and Cost of Herbicide-Resistant Green Foxtail (Setaria viridis) Across Saskatchewan Ecoregions

Nature, Occurrence, and Cost of Herbicide-Resistant Green Foxtail (Setaria viridis) Across Saskatchewan Ecoregions
Author: Hugh J. Beckie, A. Gordon Thomas, and Anne Légère (AAFC & U of S)
Date Created: June 09, 1999
Last Reviewed: February 14, 2007
Document Source: Weed Technology, Volume 13: 626–631. Summary · In Saskatchewan, a field survey was conducted in 1996 and a grain elevator survey in 1997 to determine the nature and occurrence of herbicide-resistant (HR) biotypes of green foxtail (Setaria viridis). · Based on results of the field survey, one in every 20 fields (1 million ha) in Saskatchewan is estimated to have acetyl-CoA carboxylase (ACCase) inhibitor (Group 1)-HR green foxtail. · Of the samples received from 30 grain elevators, 83% had Group 1 resistance. Similar to the field survey, incidence of aryloxyphenoxy propionate (AOPP) resistance was much higher than cyclohexanedione (CHD) resistance. · Both surveys indicated relatively low incidence of dinitroaniline (Group 3) resistance or cross-resistance (Groups 1 and 3). · Most alternative herbicides to control Group 1-HR green foxtail in broadleaf crops and cross-HR biotypes in cereal and broadleaf crops increase costs to the grower.