IDAHO WHEAT COMMISSION

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Herbicide-Resistant Weeds Threaten Grain Yields

Southern and eastern Idaho wheat and barley growers are reporting exceptional winter grain yields, however, herbicide-resistant wild oats are causing major problems. These weeds can slash wheat yields by over 24%  at high densities. UI Extension experts report rapidly growing resistance to pinoxaden (Axial), particularly in southeast Idaho, making control difficult and costly. Weed scientists recommend rotating to broadleaf crops like potatoes or sugar beets, planting CoAXium or Clearfield wheat varieties, or using triallate in tilled systems. Resistance to quizalofop and imazamox is emerging but less severe than pinoxaden resistance.