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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Host effects on interactions with microbial biocontrol agents

Smith, Kevin P. January 1900 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1997. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
2

The biology and ecology of interactions between the predatory nematode Clarkus papillatus Bastian and selected bacterial biological control agents

Salinas, Kimberly A. January 1900 (has links)
Thesis (M.S.)--West Virginia University, 2003. / Title from document title page. Document formatted into pages; contains vii, 80 p. : ill. (some col.) Vita. Includes abstract. Includes bibliographical references (p. 72-76).
3

Exploring the relationship between natural enemy biodiversity and herbivore suppression

Straub, Cory Severen, January 2006 (has links) (PDF)
Thesis (Ph. D.)--Washington State University, December 2006. / Includes bibliographical references.
4

Habitat manipulation to enhance biological control of lightbrown apple moth (Epiphyas postvittana)

Begum, Mahmuda. January 2004 (has links)
Thesis (Ph. D.)--University of Sydney, 2004. / Title from title screen (viewed 5 May 2008). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the Faculty of Rural Management. Includes bibliographical references. Also available in print form.
5

A new baculovirus isolate for the control of the Diamondback moth, Plutella Xylostella (L.) (Plutellidae:Lepidoptera) /

Kariuki, Charles Wachira, January 1996 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 1996. / Typescript. Vita. Includes bibliographical references (leaves 156-178). Also available on the Internet.
6

A new baculovirus isolate for the control of the Diamondback moth, Plutella Xylostella (L.) (Plutellidae:Lepidoptera)

Kariuki, Charles Wachira, January 1996 (has links)
Thesis (Ph. D.)--University of Missouri-Columbia, 1996. / Typescript. Vita. Includes bibliographical references (leaves 156-178). Also available on the Internet.
7

Habitat manipulation to enhance biological control of lightbrown apple moth (Epiphyas postvittana) /

Begum, Mahmuda. January 2004 (has links)
Thesis (Ph. D.)--Faculty of Rural Management, University of Sydney, 2004. / Bibliography: leaves 127-147.
8

Bugweed biocontrol: new insights into the biological control agents of Solanum mauritianum, Gargaphia decoris and Anthonomus santacruzi

Cowie, Blair William January 2016 (has links)
A Dissertation submitted to the Faculty of Science, University of the Witwatersrand, in partial fulfilment of the requirements for the degree of Master of Science, Johannesburg, South Africa. 2016. / Solanum mauritianum Scopoli (Solanaceae) is a perennial tree or shrub native to South America, which has become a prominent and widespread invader in numerous sub-tropical countries around the world. In South Africa, S. mauritianum is listed as one of the country’s worst ecological weeds, having been targeted for biological control efforts since 1984. Despite some constraints, biocontrol efforts have seen the successful release of two promising biocontrol agents. The first of these biocontrol agents, released against S. mauritianum, was the sap-sucking lace bug, Gargaphia decoris Drake (Hemiptera: Tingidae). Sap-feeding by G. decoris metabolically impaired the leaves, resulting in a reduction to their photosynthesis, with a greater effect on plants growing in full-sun compared to plants growing in the shade. This difference was attributed to higher leaf temperatures experienced in the sun. Herbivory reduced transpiration rates by more than 50%, resulting in a reduction in evaporative cooling of the leaf. The increased physiological damage experienced by full-sun plants may be a combination of stresses, particularly the direct effect of chlorophyll removal via herbivory and the indirect effect of accumulated heat–light stress. The flowerbud-feeding weevil, Anthonomus santacruzi Hustache (Coleoptera: Curculionidae), was released in 2008 as a biological control agent against S. mauritianum. The hypothesis that climate, particularly low temperature and low relative humidity, restricts the survival and establishment of A. santacruzi in South Africa was tested. Thermal assessments on A. santacruzi adults calculated the CTmin and LT50 as 4.1 ± 0.2 °C (n = 20) and 4.2 ± 0.3 °C (n = 90) respectively. The LH50 of A. santacruzi adults was calculated as 46.9%. The establishment of A. santacruzi at only the warm and humid release sites in South Africa advocates for the consideration of low temperature and low humidity as factors impeding the agents’ establishment and spread, particularly on the cooler and drier Highveld. Furthermore, the impact of A. santacruzi’s florivory on the reproductive output of S. mauritianum, as well as the potential of the agent to act as an indirect pollinator was assessed. Overall direct floral damage caused by A. santacruzi was trivial, with only ~5% of the anther and ~2% of the petal area being removed. However, the consequent effects of A. santacruzi were considerably more damaging, with 25% and 66% reductions in flowering and fruiting respectively. Additionally, fruits produced from inflorescences exposed to A. santacruzi were smaller in size, with fewer, less viable seeds. The feeding and presence of A. santacruzi also maintains the potential for indirect effects on the pollination of S. mauritianum. This suggests that in areas with well-established A. santacruzi populations, the weevils may simultaneously facilitate the self-pollination and potential inbreeding of S. mauritianum. Keywords: Agent impacts and effects; biological control; Bugweed; climatic unsuitability; ecophysiology; indirect effects; post-release evaluation. / LG2017
9

Ecological interaction among natural enemies and its consequences for biological control /

Chang, Gary C. January 2000 (has links)
Thesis (Ph. D.)--University of Washington, 2000. / Vita. Includes bibliographical references (leaves 121-139).
10

Factors affecting the establishment of a classical biological control agent, the horehound plume moth (Wheeleria spilodactylus) in South Australia /

Baker, Jeanine. January 2002 (has links) (PDF)
Thesis (Ph.D.)--University of Adelaide, Dept. of Applied and Molecular Ecology, 2002. / Includes bibliographical references (leaves 168-198).

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