Theses and Dissertations at Montana State University (MSU)
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Item Understanding the biology, ecology, and integrated managment of Ventenata dubia(Montana State University - Bozeman, College of Agriculture, 2019) Harvey, Audrey June; Chairperson, Graduate Committee: Jane M. Mangold; Lisa Rew, Timothy Prather and Jane Mangold were co-authors of the article, 'The effects of elevated temperature and CO 2 concentration on seedling growth of Ventenata dubia and Bromus tectorum' submitted to the journal 'Western North American naturalist' which is contained within this thesis.; Lisa Rew, Timothy Prather and Jane Mangold were co-authors of the article, 'Indaziflam provided up to three-years of control for Ventenata dubia in southwestern Montana' submitted to the journal 'Invasive plant science and management' which is contained within this thesis.; Stacy Davis, Lisa Rew, Timothy Prather and Jane Mangold were co-authors of the article, 'Effect of seeding date of Pseudoroegneria spicata (bluebunch wheatgrass) on establishment and subsequent ability to resist invasion by Bromus tectorum (cheatgrass)' submitted to the journal 'Ecological restoration' which is contained within this thesis.Ventenata dubia (Leers) Coss., common name ventenata or African wire grass, is a non-native winter annual grass of increasing concern in western Montana. In North American, V. dubia appeared in the early 1950s; since then it has successfully established in the northeastern and northwestern United States. It is known to invade areas previously inhabited by Bromus tectorum (cheatgrass) and Taeniatherum caput-medusae (medusahead). In the Intermountain Pacific Northwest, V. dubia has caused substantial ecological and economic impacts in perennial grass habitats. Varying disturbance regimes contribute to its rapid expansion over the last decade. Impending climate change threats have the potential to exacerbate the spread of this invasive species. Three independent studies were conducted to explore the biology, ecology, and integrated management of V. dubia populations in Montana to alleviate impacts by this species and other invasive annual grasses. A growth chamber study tested the effects of elevated carbon dioxide and temperature on seedling growth of V. dubia in response to climate change and in competition with B. tectorum. This competition replacement study indicated that at elevated climate conditions V. dubia and B. tectorum grow smaller and competition with V.dubia has the potential to decrease B. tectorum growth. A field-based herbicide efficacy trial utilizing the active ingredient indaziflam compared it to other commonly used herbicides to determine long-term control of V. dubia and potential plant community changes at 8, 11, 20, and 23 months after treatment. Foliar cover, species richness, and functional group biomass were collected. Findings indicated indaziflam can control V. dubia up to three years with positive implications for plant community dynamics. A revegetation study was used to determine the optimum seeding time for perennial grass species, Pseudoroegneria spicata, and the effects seeding time can have with competition dynamics with B. tectorum. A randomized complete block design was established and P. spicata grown for one season prior to Bromus tectorum seeding. After the second growing season, tillers and biomass were collected for both species. Findings indicated priority effects can occur with fall and early spring seeding of P. spicata, with implications for suppression of B. tectorum at earlier seeding dates.Item Evaluation of nitrogen fertilization and grazing effects on a porcupine grass (Stipa spartea var. curtiseta) community(Montana State University - Bozeman, College of Agriculture, 1974) Roath, Leonard RoyItem Ecological, biosystematic and biochemical studies of species in the genus Agropyron Gaertn. native to Montana(Montana State University - Bozeman, College of Agriculture, 1965) Collins, Don DesmondItem Effects of stress inducing factors on musk thistle (Carduus nutans L.) including--grass competition, Rhinocyllus conicus Froel., terminal flower loss, and insecticides(Montana State University - Bozeman, College of Agriculture, 1988) Corr, Daniel RobertItem Relationship of endosperm exhaustion to growth and survival of orchardgrass seedlings (Dactylis glomerata L.) subjected to cold stress(Montana State University - Bozeman, College of Agriculture, 1963) Murray, Glen A.Item Epidemiology of wheat curl mite (Aceria tosichella K.) and wheat streak mosaic virus on feral grass species and effect of glyphosate on wheat curl mite dispersal(Montana State University - Bozeman, College of Agriculture, 1998) Brey, Christopher WilliamItem A Comparison of greenhouse methods as diagnostic tools for reclamation planning(Montana State University - Bozeman, College of Agriculture, 1984) Byron, Timothy MartinItem Carbohydrate reserves of green needlegrass (Stipa viridula Trin.) as affected by clipping and fertilization(Montana State University - Bozeman, College of Agriculture, 1972) White, Larry MelvinItem An economic analysis of nitrogen fertilization of livestock pastureland in a semi-arid region(Montana State University - Bozeman, College of Agriculture, 1971) Linse, Frederick VincentItem The response to western wheatgrass and needle- and thread grass to grasshopper defoliation(Montana State University - Bozeman, College of Agriculture, 1976) Burleson, Wayne Hunter