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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 104621
Title Morphologie en biologie van de schildluis Chionaspis salicis L.
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door J.B.M. van Dinther
Author(s) Dinther, J.B.M. van
Publisher Wageningen : Veenman
Publication year 1950
Description 80 p.
Notes Ook versch. in Tijdschrift over Plantenziekten 56(1950)3 p. 173-252  show all notes
Proefschrift Wageningen
Tutors Roepke, Prof. Dr. W.K.J.
Graduation date 1950-05-11
Dissertation no. 153
Author abstract show abstract
To help fill the gap in information on scale insects in the Netherlands, a study was made on C. salicis, a species mainly infesting willows. It was considered useful to become familiar with scale insects because of the danger of the San Jos_- scale (a fruit-tree pest) spreading northwards from France and Germany.

All stages of C.salicis were described, distribution and recorded food plants were reviewed, literature on toxicity of insecticides against scale insects were summarized.

C. salicis overwintered as egg. Minimum hatching temperature was 17°-18°C. Experiments with temperatures from -1° to 13°C (90 % r.h.) showed temperature- sensitive egg stages; temperature below zero was not necessary for later development.

Young nymphs appeared in April, winged and wingless adult males in July; females oviposited in September, reproduction being mainly parthenogenetic. Sterility in the female was observed and an inverse relation between fertility and population density was found.

In experiments with other food plants, males developed on many, but females reached maturity and oviposited only on poplars.

C. salicis was parasitized, twice a year, by Aphytis fuscipennis to a total of 14%.

Online full textINTERNET
On paper FORUM ; STACKS ; 521C43
FORUM ; STACKS ; NN08202,153
FORUM ; STACKS ; NN02599,56,3(173-252)
Keyword(s) (cab) coccidae
Categories Hemiptera / Animal Anatomy and Morphology
Publication type PhD thesis
Language Dutch; Flemish
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