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Browsing by Author "McEvoy, Peter B."
Now showing items 1-14 of 14
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Assessing the safety of weed biological control : a case study of the cinnabar moth Tyria jacobaeae Fuller, Jason L. (2002-08-22)The cinnabar moth, Tyria jacobaeae (L.) (Lepidoptera:Arctiidae), was released in 1959 to control the grassland weed tansy ragwort, Senecio jacobaea L. (Asteraceae), despite evidence that caterpillars of this species ca ...
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Schooler, Shon (1998-05-07)In the first part of this study we monitored the development of biological control of purple loosestrife Lythrum salicaria over a six-year period at Morgan Lake in western Oregon. In 1992, two beetles, Galerucella pusi ...
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Larew, Hiram, 1953- (1981-12-17)The anatomies of 44 galls are discussed with special attention given to the development, longevity, and tannin content of the nutritive tissues. Within the main section of the thesis, representative galls from the major ...
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Campanella, Donald Michael (2009-06-15)A study consisting of three parts was undertaken to investigate how variation in species interactions, population genetic structure, epidemiological parameters, and plant breeding system may influence the ecology and bio ...
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Fitzpatrick, Greg S. (1995-01-09)I conducted field studies to determine the effect of insect herbivory and intraspecific plant competition on ragwort Senecio jacobaea. The objectives were to determine the patterns and causes in the distribution of the ...
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Cox, Caroline Shipley (1981-05-13)To assess the effect of summer moisture stress on the capacity of tansy ragwort (Senecio jacobaea L.) to compensate for defoliation by the cinnabar moth (Tyria jacobaeae LT7), the performance of plants grown under differ ...
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McEvoy, Peter B.; Higgs, Kimberley M.; Coombs, Eric M.; Karacetin, Evrim; Starcevich, Leigh Ann (Blackwell, 2012-06-14)We report evidence of adaptive evolution in juvenile development time on a decadal timescale for the cinnabar moth Tyria jacobaeae (Lepidoptera: Arctiidae) colonizing new habitats and hosts from the Willamette Valley to ...
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Schooler, Shon (2003-12-01)Invasive plants have the potential to reduce the diversity of species in plant and animal communities. I examined the negative effect of two invasive wetland plants, purple loosestrife and reed canary grass, on the spe ...
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Manore, Carrie Anna (2011-06-28)Modeling and analyzing the combined effects of disease and population dynamics is important in understanding the effects of mechanisms such as pathogen transmission and direct competition between host species on the di ...
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LeMaster, Michael P. (2001-09-21)Pheromones are chemical cues produced by organisms that affect the behavior and/or physiology of conspecifics. The orchestration of reproductive behaviors in many animals depends on the expression of sex pheromones. In ...
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Macdonald, Catherine A. (1989-06-02)I used field experiments to study how plants in two grassland communities colonized soil mounds made by the Camas pocket gopher, Thomomys bulbivorus (Richardson). I identified potential mound colonizers in each source ...
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Kohler, Glenn R. (2007-04-23)The hemlock woolly adelgid, Adelges tsugae, is causing widespread mortality of eastern hemlock, Tsuga canadensis, in the eastern United States. In the West, A. tsugae causes negligible damage to western hemlock, Tsuga he ...
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Murtaugh, Paul A.; Emerson, Sarah C.; McEvoy, Peter B.; Higgs, Kimberley M. (The Statistical Analysis of Insect Phenology, 2012-04)Weintroduce two simple methods for the statistical comparison of the temporal pattern of life-cycle events between two populations. The methods are based on a translation of stagefrequency data into individual Ôtimes i ...
Now showing items 1-14 of 14
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