Control of Amsinckia hispida and Juncus bufonius (toadrush) with herbicides

Abstract

The control by herbicides of an infestation of Amsinckia hispida and toadrush (Juncus bufonius) in wheat was investigated at Wagga Wagga, New South Wales, during 1979 and 1980. Bromoxynil, bromoxynil+MCPA, terbutryne and methabenzthiazuron+2,4-D were used in both years, dicamba+MCPA in 1979, and dicamba and experimental herbicide DPX4189 (GleanTM®) in 1980. All herbicides reduced weed densities and improved crop yields. Terbutryne gave greatest control of weed populations, in excess of 98% in both years. Grain yield was more than doubled in each case. GleanTM produced the highest grain yield in 1980 although weed control was not as good as from some other herbicides. However, the undersown pasture legumes, particularly subterranean clover, had poorer survival from this herbicide. Dicamba and dicamba+MCPA were inferior to the other chemicals in the control of these weeds.