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Library Catalogue

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    Union Catalogue of Agricultural Libraries in the Netherlands

    The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.

    Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.

    The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.

    As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".

    All titles are entered in their original language. Keywords are added to facilitate subject searching.

    The database is updated every day and now contains over 830.000 records.

Record number 104185
Title Seasonal fluctuations of population density of the cabbage aphid, Brevicoryne brassicae (L.), in the Netherlands, and the role of its parasite, Aphidius (Diaeretiella) rapae (Curtis)
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door M. Hafez Mohammed
Author(s) Hafez Mohammed, M.
Publisher Wageningen : Veenman
Publication year 1961
Description 104 p ill
Notes Proefschrift Wageningen
Tutors Wilde, Prof. Dr. J. de ; Klomp, Prof. Dr. H.
Graduation date 1961-11-01
Dissertation no. 314
Author abstract show abstract
Brevicoryne brassicae (L.) had 4-14 generations in the year, it overwintered in the egg stage on cruciferous plants and reached a peak of abundance on brussels sprouts in July, rapidly declined and increased again in September-October. The mid-season decline proved to be due to increased mortality rather than to reduction of reproduction or to migration.

Abiotic factors and biotic factors, entomophagous fungi, predators and parasites, Aphidius rapae, (Curtis) were all involved.

A. rapae was an internal parasite, only one adult emerged from each host. The parasite overwintered as a last-instar-larva inside the host. The adults emerged in spring. There were 5-11 generations a year each lasting 14-16 days. Eggs were deposited singly and at random in infested aphids. Half-grown nymphs seemed to be preferred to other stages and wingless to winged.

Parasitism eliminated reproduction completely if it occurred early in the host development but not necessarily if it were delayed until the fourth instar or later. Host development was always delayed.

Parasitism caused only a small proportion of total aphid mortality though it sometimes reached 80-90 % of the stem-mothers on overwintered brussels sprouts. Hyperparasites, like Charips ancylocera, reduced effectiveness. Also the slower development of A. rapae than of B.brassicae reduced its effectiveness.

Online full textINTERNET
On paper FORUM ; STACKS ; NN08202,314
FORUM ; STACKS ; 303C86 ; Not for loan
Keyword(s) (cab) insects / plant pests / cabbages / aphididae / biological control / beneficial insects / braconidae / netherlands
Categories Ecological Entomology
Publication type PhD thesis
Language English
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