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Thinning and urea fertilization effects on emerging grand fir (Abies grandis) foliage and growth of western spruce budworm (Choristoneura occidentalis) larvae /Savage, Thomas J. January 1987 (has links)
Thesis (M.S.)--Oregon State University, 1988. / Typescript (photocopy). Includes bibliographical references (leaves 35-41). Also available on the World Wide Web.
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Potentiel de l'analyse des macrorestes pour détecter les épidémies de la tordeuse des bourgeons de l'épinette dans des sols de sapinières boréales /Potelle, Bruno, January 1995 (has links)
Mémoire (M.Ress.Renouv.)--Université du Québec à Chicoutimi, 1995. / Document électronique également accessible en format PDF. CaQCU
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Les épidémies de tordeuse des bourgeons de l'épinette à travers les arbres subfossiles /Simard, Sonia, January 2003 (has links)
Thèse (M.Ress.Renouv.) -- Université du Québec à Chicoutimi, 2003. / Bibliogr.: f. [59]-64. Document électronique également accessible en format PDF. CaQCU
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Western Spruce Budworm, Climate, and Forest Fire Interactions in the Interior Pacific Northwest: A Multi-Century Dendrochronological AnalysisFlower, Aquila 10 October 2013 (has links)
I assessed the relationship between natural disturbances and climate in Douglas-fir forests in western North America. I quantified synchrony within disturbance types, explored the potential for synergism between disturbance types, and analyzed changes in disturbance dynamics that have occurred following Euro-American settlement of western North America. I used new and previously published dendrochronological reconstructions of disturbance histories and climatic variability to explore these complex interactions at multiple spatial scales over the last three centuries.
I used dendroentomological methods to reconstruct western spruce budworm outbreaks at thirteen sites along a transect running from central Oregon to western Montana. These forests experienced repeated, often decadal-length western spruce budworm outbreaks over the last three centuries. I compared my records with previously published outbreak reconstructions and found widespread synchrony of outbreaks at stand-level, regional, and sub-continental scales. At ten of my sites, I also reconstructed or obtained previously published reconstructions of fire dates. I compared these disturbance histories with dendroclimatological drought records to quantify the influence of moisture availability on disturbances.
I found that fires were more likely to occur during drought years, while western spruce budworm outbreaks were most likely to begin near the end of droughts. After approximately 1890, fires were largely absent from these sites and western spruce budworm outbreaks became longer-lasting, more frequent, and more synchronous, likely due to land-use induced changes in the structure and composition of forests. My results show no discernible impact of defoliation events on subsequent fire risk. Any effect from the addition of fine and coarse fuels during defoliation events was too small to detect given the overriding influence of climatic variability. If there is any relationship between the two disturbances, it is a subtle synergistic relationship wherein each disturbance type dampens the severity but does not alter the probability of occurrence of the other disturbance type over long time scales.
This dissertation includes unpublished co-authored material. / 10000-01-01
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INTERRELATIONSHIP OF A PARASITOID, HYPOSOTER EXIGUAE, PATHOGEN, BACILLUS THURINGIENSIS, AND HOST, HELIOTHIS VIRESCENS.Thoms, Ellen Mary. January 1982 (has links)
No description available.
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Determination of trace elements levels in plasma from larvae in the course of baculoviral and bacterial infections by inductively coupled plasma-mass spectrometry (ICP-MS)Sun, Rui. Robertson, J. David January 2009 (has links)
Title from PDF of title page (University of Missouri--Columbia, viewed on Feb 19, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Thesis advisor: Dr. John D. Robertson. Includes bibliographical references.
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Jack Pine Signalling and Responses to HerbivoryLazebnik, Jenny Unknown Date
No description available.
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Induced monoterpene responses in jack pine: defence against jack pine budworm and a fungal associate of the mountain pine beetleColgan, Lindsay Jessica Unknown Date
No description available.
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Induced monoterpene responses in jack pine: defence against jack pine budworm and a fungal associate of the mountain pine beetleColgan, Lindsay Jessica 11 1900 (has links)
My thesis research investigated monoterpene responses in jack pine (Pinus banksiana Lamb.) to different agents to better understand how these responses may influence the spread of the mountain pine beetle (Dendroctonus ponderosae Hopkins; MPB) in the boreal forest. The results support that monoterpenes are inducible responses in jack pine. In the first study, methyl jasmonate application elicited the greatest response in juvenile and mature trees suggesting that jasmonic acid plays a role in jack pine defence responses. In the cross-induction study, I found evidence of an increase in resistance to Grosmannia clavigera with prior jack pine budworm defoliation (Choristoneura pinus pinus Freeman; JPBW). In contrast, needle monoterpenes greatly increased after G. clavigera inoculation and continued to increase during JPBW defoliation; however, JPBW increased its feeding rate to compensate for a change in host quality. Overall, monoterpene induction in jack pine depended on the agent(s) involved and their order. The systemic responses that were observed may have implications for MPB spread in the boreal forest. / Forest Biology and Managment
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Relations temporelles entre des données de défoliation par la tordeuse des bourgeons de l'épinette (choristoneura fumiferana) et la croissance du sapin baumier (abies balsamea) /Gionest, François, January 1999 (has links)
Mémoire (M.Ress.Renouv)--Université du Québec à Chicoutimi, 1999. / Document électronique également accessible en format PDF. CaQCU
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