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<br />control when combined with streambank wheatgrass; and 46-83% better control when <br />Curtail was combined with thickspike wheatgrass compared to other suppression <br />treatments combined with this grass species. More crested wheatgrass biomass was <br />harvested than any other seeded grass species within any herbicide treatment except that <br />harvested seeded grass biomass from Curtail plus crested wheatgrass and Curtail plus <br />streambank wheatgrass were similar (Table 9). There was about 4 times more seeded <br />grass harvested from the Curtail plus crested wheatgrass compared to Curtail plus <br />thickspike wheatgrass and 112 times more than in the Curtail plus Russian wildrye <br />combination. Approximately 7 times more seeded grass was harvested from the Roundup <br />plus crested wheatgrass combination than Roundup plus streambank wheatgrass, 3 times <br />more than Roundup plus thickspike wheatgrass, and 23 times more than Roundup plus <br />Russian wildrye. Sixteen times more seeded grass was harvested from the Escort plus <br />crested wheatgrass combination than Escort plus streambank wheatgrass, 18 time more <br />than Escort plus thickspike wheatgrass, and 105 times more than the Escort plus Russian <br />wildrye combination. Additionally, 2-35 times more crested wheatgrass was harvested <br />from the Escort plus crested wheatgrass combination than any other suppression treatment <br />combined ~~ith crested wheatgrass seeding. Al] grasses established poorly within the <br />mowing suppression treatment and the no suppression treatment control, although, crested <br />wheatgrass within the control treatment established better than Russian wildrye (as <br />evidenced by harvested biomass of seeded grasses). The effect of the treatment by seeded <br />grass interaction on seeded grass cover was similar to seeded grass biomass (Table 10). <br />Any suppression treatment combined with crested wheatgrass seeding produced greater <br />seeded grass cover than any suppression treatment combined with any other seeded grass <br />species. Also, any herbicide treatment combined with crested wheatgrass seeding <br />produced greater crested wheatgrass cover than mov.~ing plus crested wheatgrass which <br />produced greater crested wheatgrass cover than the non-treated control plus crested <br />wheatgrass seeding. For example, any herbicide plus crested wheatgrass produced on the <br />average 45% (8 times) more crested wheatgrass cover than the mowing plus crested <br />wheatgrass and 37% (3.5 times) more than the non-treated control plus crested <br />wheatgrass. Upon comparing seeded grass cover vrithin any suppression treatment or the <br />control, it is apparent that crested wheatgrass established the best. When crested <br />wheatgrass seeding was preceded by the Curtail application, crested wheatgrass cover was <br />37, 40, and 50% greater than when this herbicide was combined with thickspike <br />wheatgrass, streambank wheatgrass, or Russian wildrye, respectively. Roundup plus <br />crested wheatgrass produced 28% greater seeded grass cover than Roundup plus <br />streambank wheatgrass, 35% more than Roundup plus thickspike wheatgrass, and 43% <br />more cover than Roundup plus Russian wildrye. Crested wheatgrass cover from the <br />Escort plus crested ~~heatgrass combination was 46% greater than Escort plus streambank <br />wheatgrass, 47% greater than Escort plus thickspike wheatgrass, and 52% greater than <br />Escort plus Russian wildrye. Crested wheatgrass also established best within the mowing <br />plus crested wheatgrass or the non-treated control plus crested wheatgrass combinations <br />where mowing plus crested wheatgrass produced 6, ~, and 7% greater seeded grass cover <br />than moving plus streambank wheatgrass, thickspike wheatgrass, or Russian wildrye, <br />respectively; or where the control plus crested wheatgrass produced 13% more seeded <br />-12- <br />