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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

Fitness costs of pyrethroid resistance in Heliothis virescens

Dubbeldam, Aart A. January 1997 (has links)
No description available.
2

Selection for asulam resistance in barley

Giffard, S. C. January 1985 (has links)
No description available.
3

Laboratory studies on the effect of 'stress' on the susceptibility of the diamond moth (Plutella xylostella) and the rose-grain aphid (Metapolophium dirhodum) to insect pathogens

Schuler, Tanja H. January 1995 (has links)
No description available.
4

Pesticide regulatory actions and the development of pest resistance : a dynamic bioeconomic model /

Kazmierczak, Richard Francis, January 1991 (has links)
Thesis (Ph. D.)--Virginia Polytechnic Institute and State University, 1991. / Vita. Abstract. Includes bibliographical references (leaves 284-299). Also available via the Internet
5

Development and characterization of resistance to the Cry1F toxin from Bacillus thuringiensis Berliner in the European corn borer, Ostrinia nubilalis (Hübner) (Lepidoptera: Crambidae)

Pereira, Eliseu J. G. January 1900 (has links)
Thesis (Ph.D.)--University of Nebraska-Lincoln, 2006. / Title from title screen (site viewed April 26, 2007). PDF text: v, 109 p. : ill. UMI publication number: AAT 3229553. Includes bibliographical references. Also available in microfilm and microfiche formats.
6

Sublethal effects of Bacillus thuringiensis Berliner on the diamondback moth, Plutella xylostella (L.), and its natural enemy, Cotesia plutellae Kurdjumov : implications for resistance management

Grbin, Lynne C. January 1997 (has links) (PDF)
Bibliography: leaves 165-188. This research examines biological and behavioural interactions among the diamond-back moth, Plutella xylostella L. (Lepidoptera: Plutellidae), Cotesia plutellae Kurdjumov (Hymenoptera: Braconidae) and the microbial insecticide, Bacillus thuringiensis Berliner. A deterministic simulation model is developed describing the influence of C. plutellae on the evolution of resistance to Bt in a diamond-back moth poulation.
7

Genetics and gene flow of organophosphate resistance in three predatory mites, Amblyseius andersoni Chant, Typhlodromus pyri Scheuten and Metaseiulus occidentalis Nesbitt (Acarina: Phytoseiidae), in Oregon

Dunley, John E. 21 July 1993 (has links)
Genetics, gene flow, and distribution of pesticide resistance traits were examined for organophosphate (OP) resistance in three beneficial phytoseiid mites. Levels and genetics of OP resistance in Amblyseius andersoni were examined first. Laboratory strains from Italy and Oregon, USA, were compared in susceptibility to insecticides used in western Oregon fruit crops. The Italian strain was 80-100 times more resistant to the OPs azinphosmethyl, diazinon, malathion, and phosalone, as well as carbaryl, a carbamate. Significant differences were not found between strains for endosulfan or fenvalerate. Using backcross analysis, response of F1 hybrids to azinphosmethyl indicated OP resistance was semidominant. Through novel statistical analysis, backcross of F1 to parent strains revealed resistance was polygenic, with at least two loci. Reciprocal crosses demonstrated the presence of maternal effects, with increased variation associated with progeny of Oregon females. In the next set of experiments, electrophoresis of allozymes was used to estimate gene flow for Typhlodromus pyri. Ten populations from two apple growing valleys of Oregon were compared. Subpopulations were collected from in and around commercial apple orchards. Four loci unaffected by pesticide use were examined. FST was calculated at 0.115, and Nm as 2.08. No allelic patterns could be discerned for populations among or within valleys; however, more variation was present for mite populations within valleys than between them. Some inbreeding was found within populations. While from dispersal studies one would conclude T. pyri is nondispersive, allozymic analysis indicates there is moderate gene flow. Factors affecting OP resistance distribution in T. pyri and Metaseiulus occidentalis were examined. A diagnostic concentration of azinphosmethyl was used to determine OP resistance frequencies for populations of each species, collected in and near commercial apple orchards in two valleys. OP resistance in T. pyri populations was localized: mites from 10 m or more outside orchards were OP susceptible, while those within orchards were resistant. This indicated limited gene flow. All M. occidentalis populations were resistant, indicating a regional resistance pattern and high gene flow. Factors which were not significant in the distribution of OP resistance were: valley, degree of orchard isolation, host plant, and seasonality. / Graduation date: 1994
8

Sublethal effects of Bacillus thuringiensis Berliner on the diamondback moth, Plutella xylostella (L.), and its natural enemy, Cotesia plutellae Kurdjumov : implications for resistance management / by Lynne Grbin.

Grbin, Lynne C. January 1997 (has links)
Bibliography: leaves 165-188. / ix, 188 leaves, [2] leaves of plates : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / This research examines biological and behavioural interactions among the diamond-back moth, Plutella xylostella L. (Lepidoptera: Plutellidae), Cotesia plutellae Kurdjumov (Hymenoptera: Braconidae) and the microbial insecticide, Bacillus thuringiensis Berliner. A deterministic simulation model is developed describing the influence of C. plutellae on the evolution of resistance to Bt in a diamond-back moth poulation. / Thesis (Ph.D.)--University of Adelaide, Dept. of Crop Protection, 1998
9

Sublethal effects of Bacillus thuringiensis Berliner on the diamondback moth, Plutella xylostella (L.), and its natural enemy, Cotesia plutellae Kurdjumov : implications for resistance management /

Grbin, Lynne C. January 1997 (has links) (PDF)
Thesis (Ph. D.)--University of Adelaide, Dept. of Crop Protection, 1998. / Includes bibliographical references (leaves 165-188).
10

Biochemical factors of resistance and management of Colorado potato beetle, Leptinotarsa decemlineata (Say), (Coleoptera: Chrysomelidae).

Gouamene Lamine, Christiane N. 01 January 1994 (has links) (PDF)
No description available.

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