Includes full-text resources emanating from a complete set of Australian Rangelands Society Proceedings, journal articles from The Rangelands Journal (published by CSIRO Publishing for the Australian Rangelands Society), videos and other resources abou the extensive rangelands of Australia.
Native forb response to sulfometuron methyl on medusahead-invaded rangeland in Eastern Oregon
Medusahead [Taeniatherum caput-medusae (L.) Nevski], a non-native, winter-annual grass (Poaceae), has invaded rangelands throughout the western USA. Medusahead is an aggressive competitor that crowds out native plants and reduces forage for wildlife and livestock. Sulfometuron methyl is a sulfonylurea herbicide used to control medusahead, but its effect on non-target native forbs is largely unknown. We assessed the impact of an autumn application of sulfometuron methyl on native forbs on the sagebrush/bunchgrass steppe of eastern Oregon over 3 years. We applied 70ga.i./ha (1.0oz. a.i./acre) of sulfometuron methyl to randomly selected locations on three sites in a split-plot-in-time (repeated-measures) experimental design. Three years after treatment, 6 of the 11 forb species studied had a significant reduction in density (P less than 0.05), with densities ranging from 3 to 60% of the pre-treatment levels. The results of this study suggest that the benefit of medusahead control by sulfometuron methyl should be weighed against the damage to non-target species.
Name of Journal:
The Rangeland Journal