The production of herbicide-resistant jointed goatgrass (Aegilops cylindrica) x wheat (Triticum aestivum) hybrids in the field by natural hybridization and management strategies to reduce their occurrence

Two imazamox-resistant hybrids from a cross between A. cylindrica and an im azamox-resistant wheat ('cv' FS-4 IR wheat) were discovered in a research p lot where FS-4 IR wheat seed had been replanted from the harvest of an effi cacy study conducted the year before. Seven seeds (BC1) were produced by th ese plants. Six of the seven seedlings from these seeds survived an applica tion of 72 g ai ha(-1) imazamox. Management strategies to reduce the occurr ence of herbicide-resistant A. cylindrica x wheat hybrids can be incorporat ed before, during, and after the crop year when the herbicide-resistant whe at is planted. Strategies to control hybrids that do occur are discussed. T hese strategies take advantage of the biology of the A. cylindrica x wheat hybrid plant.