Theses and Dissertations at Montana State University (MSU)
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Item Restoration of spotted knapweed infested grasslands in Glacier National Park(Montana State University - Bozeman, College of Agriculture, 2003) Stringer, Lewis Tipton; Chairperson, Graduate Committee: Catherine A. ZabinskiThere is an immediate and on-going need in Glacier National Park (GNP), and other public and private lands, to determine effective methods to re-establish and sustain native plant populations following control treatments of Centaurea maculosa. My research was developed in response to GNP concerns regarding annual herbicide treatment of C. maculosa invaded sites. The aim of this study was to determine if herbicide applications, site preparation and revegetation methods would increase the density and percent cover of native species, while reducing spotted knapweed at two sites in and near Glacier National Park. A priori contrast analysis was used to determine differences in treatment effects. The results of my experiment show that spot spray herbicide application reduced C. maculosa cover without significantly reducing existing native forbs. However, a repeat-herbicide application increased exotic graminoid cover. Tillage reduced the density of C. maculosa seedlings, but resulted in an increase in C. maculosa percent cover, and an overall decline in native forbs. Revegetation methods had limited success at increasing native species, and reducing C. maculosa. The only effect was at Swift Current, where the percent cover of native forbs was significantly higher with the planting treatment, and most pronounced in plots with repeat-herbicide application. Additionally, we measured the composition and density of the seed bank in C. maculosa dominated sites using the seedling emergence method. C. maculosa density was 3,900 and 6,714 seeds / m 2 at the two sites, which was 2 and 3 times higher than the sum of all other species. Seed bank composition and density needs to be considered in efforts to restore C. maculosa infested areas.Item Geographical analysis of the distribution and spread of invasive plants in the Gardiner Basin, Montana(Montana State University - Bozeman, College of Letters & Science, 2003) Rens, Emily NicoleItem A study of Urophora affinis (Diptera : Tephritidae) released on spotted knapweed in Western Montana(Montana State University - Bozeman, College of Agriculture, 1976) Story, Jim MaynardItem Mode of action of maculosin, a host-specific phytotoxin, produced by Alternaria alternata on spotted knapweed (Centaurea maculosa L.)(Montana State University - Bozeman, College of Agriculture, 1992) Park, Sang HoItem Belowground mechanisms that affect nutrient uptake and response to herbivory of Centaurea maculosa and native bunchgrasses(Montana State University - Bozeman, College of Agriculture, 2003) Zimmerley, Sara TheresaItem Nitrate uptake and water use of Centaurea maculosa (spotted knapweed) and native grasses(Montana State University - Bozeman, College of Agriculture, 2000) Blicker, Pamela SueItem Sampling and modeling plant infestations : alternatives for identifying invasive plant distributions in rangeland environments(Montana State University - Bozeman, College of Agriculture, 2001) Roberts, Elizabeth AnnItem Spotted knapweed (Centaurea maculosa L.) seed longevity, chemical control and seed morphology(Montana State University - Bozeman, College of Agriculture, 1990) Davis, Edward StuartItem Detecting and mapping leafy spurge (Euphorbia esula) and spotted knapweed (Centaurea maculosa) in rangeland ecosystems using airborne digital imagery(Montana State University - Bozeman, College of Agriculture, 2002) Driscoll, Shana GraceItem Relationship between spotted knapweed and indigenous plant assemblages and prediction of plant community response to picloram(Montana State University - Bozeman, College of Agriculture, 1999) Kedzie-Webb, Susan