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Responses Of Canada Thistle To Defoliation And To Damage From A Stem-Mining Weevil In Utah, Wendy Sue Halsey
Responses Of Canada Thistle To Defoliation And To Damage From A Stem-Mining Weevil In Utah, Wendy Sue Halsey
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The responses of Canada thistle stems to damage by two types of herbivores were investigated to determine the potential role of these herbivores as biological control agents. Canada thistle stems at a cattle exclosure in Rich County, Utah were cut at one to two centimeters aboveground in June, 1991, to mimic grazing by cattle. Neighboring stems within 30 centimeters were also cut in some treatments to investigate the effects of physiologically connected ramets on the growth and reproductive responses of individual focal stems. I measured plant height, stem diameter, and number of flowerheads for each of the focal stems during …