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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

The oviposition behaviour of Pieris rapae : a study in the ecological interpretation of insects' egg distributions / by Penelope M. Ives

Ives, Penelope Margaret January 1974 (has links)
1 v. (various paging) : ill. ; 27 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Thesis (Ph.D.)--Dept. of Zoology, University of Adelaide, 1975
2

The oviposition behaviour of Pieris rapae : a study in the ecological interpretation of insects' egg distributions /

Ives, Penelope Margaret. January 1974 (has links) (PDF)
Thesis (Ph.D.) -- Dept. of Zoology, University of Adelaide, 1975.
3

Biological control of lepidopterous cabbage pests using Polistes fuscatus (Hymenoptera; Vespidae)

Gould, Walter Paul. January 1982 (has links)
Thesis (M.S.)--University of Wisconsin--Madison, 1982. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 67-71).
4

Biology of shoot blight, dieback and crown rot on Pieris japonica in Ohio nurseries /

Gerlach, Wolfgang Wilhelm Paul January 1974 (has links)
No description available.
5

Effects of parasitism of two Cotesia spp. parasitoids released for biological control of an invasive pest butterfly (Pieris rapae) on two native pierid butterflies (Pieris napi oleracea and Pieris virginiensis) in Massachusetts.

Benson, Jessica L. 01 January 2000 (has links) (PDF)
No description available.
6

Seasonal abundance and biology of hyperparasites and their hosts associated with Pieris rapae (L.) (Lepidoptera: Pieridae) in the Brassica crop system /

Gaines, David N., January 1992 (has links)
Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 115-117). Also available via the Internet.
7

Le décollage chez les insectes : de la mécanique du vol à la morphologie fonctionnelle / Take-off in insects : from flight mechanics fo functional morphology

Bimbard, Gaëlle 15 November 2013 (has links)
D’une importance majeure, la phase de décollage reste, à ce jour, une étape très mal connue du vol de l’insecte. Dans ce contexte, l’objectif de ce travail de thèse était d’identifier les différents mécanismes impliqués dans la production des forces lors du décollage chez Pieris rapae. En examinant la cinématique des ailes et du corps de l’insecte lors de l’initiation du vol, nous avons pu mettre en évidence le rôle majeur des mouvements combinés de l’abdomen, du thorax et enfin du plan de battement dans le mécanisme de redirection des forces régissant cette phase transitoire. Dans un second temps, via une combinaison d’approches numériques et expérimentales, nous avons également montré que les pattes participeraient activement à la manœuvre, générant d’importantes forces verticales responsables de l’accélération initiale de l’insecte. Une étude de la morphologie fonctionnelle de l’insecte a finalement permis de mettre en évidence les différents muscles potentiellement impliqués lors de cette phase du vol. / Despite being of major importance in insect flight, the mechanisms underlying take-off stage remain elusive. The purpose of this thesis is to explore the different mechanisms involved in force production during Pieris rapaes cabbage butterflies take-off. Detailed wings and body motions kinematics unraveled the crucial role of combined motions of the abdomen and thorax together with the angle of the stroke plane, to ensure the forces reorientation governing the transient flight initiation phase. In a second approach, legs extension active contribution to force production during take-off is suggested using a combination of numerical and experimental approaches. Finally, results are discussed from the insect morphology perspective, highlighting the principal muscles potentially involved during flight initiation.
8

Effects of climate on phenological synchrony between butterflies and their host plants

Posledovich, Diana January 2015 (has links)
Shifts in species’ phenologies and phenological asynchronies between the interacting organisms have received a lot of attention in the context of climate change. Changes in temporal overlap between species, caused by phenological asynchrony, make species depending on one another become so separated in time that they can no longer interact. This may have important consequences both for single species, like fluctuations in abundances, and for the functioning of whole communities by creating mismatches between trophic levels and rearrangements of community structure. This thesis focuses on the impact of temperatures on spring timing and phenological synchrony in a herbivorous insect – host plant system, consisting of the orange tipbutterfly Anthocharis cardamines and five of its Brassicaceae host plant species. Paper I demonstrates that diapause duration and winter thermal conditions can determine the timing of spring emergence in the herbivore, and these traits may differ between species with different feeding strategies. In paper II we show that thermal reaction norms of post-winterdevelopment of A. cardamines display cogradient latitudinal variation.Paper III shows that temperature-mediated phenological plasticity of A. cardamines butterflies and a majority of the most used host plant species is similar within populations originating from different latitudes. Thus, the species’ timing appeared well conserved in response to thermal variation. In paper IV we explored the importance of the butterfly’s adult emergence and thermal conditions on the succeeding part of the butterfly’s life-cycle – larval development. The outcome from the interaction was examined for both the insect and the plant side. The degree in phenological overlap between the female butterflies and host plants as well as temperatures during larval development were found to influence larval development but had no effect on plant reproductive fitness. The four papers of the presented thesis demonstrate that developmental preadaptations, evolvedin a herbivore to maintain phenological synchrony with host plants across yearly variation of spring conditions, can prevent disruption of the interaction under a wide range of temperatures. This indicates that temporary constrained interactions are not always vulnerable to decoupling, particularly if they involve generalist strategy. / <p>At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 3: Manuscript. Paper 4: Submitted.</p> / Ekoklim
9

Phenology, natural enemies, and management of Lepidopteran pests of cole crops in Alabama

Maxwell, Elly Marie, Fadamiro, Henry Y. January 2006 (has links) (PDF)
Thesis(M.S.)--Auburn University, 2006. / Abstract. Vita. Includes bibliographic references (p.93-105).
10

Impact of the microbial pesticide Bacillus thruingiensis Berliner subsp. kurstaki on Hymenopterous parasites of the imported cabbageworm, Pieris rapae (L.) (Lepidoptera: Pieridae)

McDonald, Richard C. 19 October 2005 (has links)
Three formulations of Bacillus thuringiensis Berliner subsp. kurstaki (Dipel 4L, Dipel 2X, and ABG-6167) were compared with the synthetic pyrethroid perrnethrin ( common name Pounce 3. 2 EC) for insecticidal activity and impact upon parasitism of the imported cabbageworrn, Pieris rapae (L.) (Lepidoptera: Pieridae) in field broccoli (CV Packrnan) from fall 1986 to spring 1988. Perrnethrin, Dipel 4L, and ABG-6167 were not significantly different in their efficacy towards imported cabbageworm larvae. Parasitization of P. rapae by the larval parasite Cotesia glomerata (L.) (Hymenoptera: Braconidae) and the pupal parasite Pteromalus puparum (L.) (Hyrnenoptera: Pteromalidae) continued after spraying in the B. thuringiensis plots, but was not significantly different from perrnethrin. However, 100% of the P. rapae chrysalids recovered were parasitized by P. puparum. The impact of seasonal hyperparasitism was compared between .Q. glomerata, and a Yugoslavian strain of Cotesia rubecula (Marshall), an exotic larval parasite of the imported cabbageworm. Four hyperparasites, two of them attacking both~. glomerata and~. rubecula, were found in field plots from 1986-1988. The level of hyperparasitization for the two primary parasites was significantly different. Hyperparasitization averaged only 8.1% for C. glomerata from 1986-1988, but was 37. 9% for C. rubecula from 1987-1988. During the early- to mid-season of 1988, hyperparasite activity was not detectable and C. rubecula outcompeted C. glomerata for hosts; but by mid-season, hyperparasite activity against C. rubecula increased to 100%, causing its populations to crash. C. glomerata then became the dominant parasite of P. rapae. C. rubecula was not recovered in 1989. Hyperparasites may be a limiting factor in establishing C. rubecula in southwestern Virginia. Mortality and successful pupation of P rapae fourth instars parasitized by C. rubecula to B. thuringiensis endotoxin at dosages of 850, 85, and 8.5 I.U./ml was examined. After day two, the LC<sub>50</sub>'s of parasitized fourth instars were approximately thirty times higher than that of unparasitized larvae and by day four, the LC<sub>50</sub> response of parasitized fourth instars was 180 times higher than unparasitized larvae. Twenty-five percent of parasitized fourth instars exposed to a concentration of 850 I.U./ml successfully pupated, compared to 76% at 85 I.U./ml and 69% at 8.5 I.U./ml. Parasitized fourth instar P. rapae consume less food and are therefore less susceptible to B. thuringiensis than unparasitized larvae at the same dosages. / Ph. D.

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