- 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.
Search results
Showing 11 to 20 of 151 (0.011 seconds)| 11 |
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
|
| 12 |
Bionomics and development of the cabbage maggot, Hylemya brassicae (Wiedemann).Dapsis, Lawrance Joseph 01 January 1982 (has links) (PDF)
No description available.
|
| 13 |
A study of variation in the cabbage yellows organism Fusarium conglutinans Wr.Blank, Lester M. January 1930 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1930. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 52-53).
|
| 14 |
Etude sur les ravageurs du chou et en particulier sur la mouche du chou, Hylemya brassicae Wiedemann (Diptera:Anthomyiidae).Vincent, Charles, 1953- January 1980 (has links)
No description available.
|
| 15 |
Etude sur les ravageurs du chou et en particulier sur la mouche du chou, Hylemya brassicae Wiedemann (Diptera:Anthomyiidae).Vincent, Charles, 1953- January 1980 (has links)
No description available.
|
| 16 |
Utilizing radiation #wasted' by the potato cropOpoku-Ameyaw, Kwabena January 1991 (has links)
No description available.
|
| 17 |
The effect of clubroot on the growth and carbon metabolism of Arabidopsis thaliana and Brassica campestrisEvans, Joanne Louise January 1997 (has links)
No description available.
|
| 18 |
Cytology and cytogenetics of the cabbage root fly Delia radicumEl-Alfy, N. Z. A. January 1984 (has links)
No description available.
|
| 19 |
Influence of different light regimes of broad band and monochromatic radiation on the induction of diapause in the cabbage maggot Hylemyia brassicae (Bouché) (Diptera: Anthomyiidae).Sosnowska, Bozena Magdalena. January 1971 (has links)
No description available.
|
| 20 |
Effect of light on Hylemyia Brassicae Bouche.Owusu-Manu, Edward. January 1969 (has links)
No description available.
|
Page generated in 0.0145 seconds