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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.
Search results
Showing 1 to 10 of 222 (0.031 seconds)| 1 |
The environmental conditions affecting the genetic mechanism of wing production in the chrysanthemum aphidWhite, Winifred Sharlene, January 1900 (has links)
Thesis--University of Michigan. / Reprinted from the American naturalist, vol. LXXX ... March, 1946. Literature cited: p. 269-270.
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Aspects of pea aphid nutritionRetnakaran, Arthur, January 1967 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1967. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
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Population dynamics of the cabbage aphid Brevicoryne Brassicae (L.) (Homoptera:Aphididae in Vancouver, British Columbia : a quantitative study an synthesis of ecological relationshipsRaworth, David Arnold January 1982 (has links)
The population dynamics of the cabbage aphid (Brevicoryne brassicae) were studied on Maris Kestrel kale during the summer months, in Vancouver British Columbia, Canada. The object was to describe the temporal variation in numbers, age distribution, and quality of B. brassicae in terms of quantitative relationships between the aphid and its biotic and abiotic environment, using a simulation model. A technique was developed whereby aphid fecundity and developmental time could be estimated for aphids within the population. Aphid fecundity and rate of development decreased continuously through the season, probably in response to changes in plant quality. The plant rarely posed an upper limit on aphid increase, but populations consistently showed an initial maximal rate of increase followed by a leveling off, and eventual population decline in the autumn. Evidence presented, suggests that syrphid predation was largely responsible for the major mid-season shifts in the rate of increase of the aphid. Thompson's (1924) 'random search' model did not adequately represent syrphid predation, and further detailed studies are required. Decreasing aphid developmental and reproductive rates, production of oviparae, predation, and leaf fall, were probably responsible for population declines in the autumn. The cabbage aphid system is compared with that described by Hughes (l963) and Hughes & Gilbert (1968). The problems of generality and biological control are discussed. / Land and Food Systems, Faculty of / Graduate
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The biology of the clover mite, Bryobia praetiosa Koch, with preliminary investigations on its control.Kelley, Roger Weston 01 January 1955 (has links) (PDF)
No description available.
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Physiological aspects of form determination in aphidsGao, Nong January 1996 (has links)
No description available.
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The genetic structure and variation of aphid populations in a heterogeneous environmentAmos, W. January 1985 (has links)
No description available.
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The ecology of the spruce shoot aphid Cinara pilicornis (Homoptera-Aphididae)Edwards, T. L. January 1985 (has links)
No description available.
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The molecular genetic basis of insecticide resistance in the peach-potato aphid Myzus persicae (sulzer)Field, Linda Mary January 1989 (has links)
No description available.
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The effects of pyrethroid insecticides upon parasitic hymenoptera in the cereal ecosystemLongley, Martin January 1995 (has links)
No description available.
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Manipulation of overwintering habitats for invertebrate predators on farmlandThomas, Matthew Brian January 1991 (has links)
No description available.
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