Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Adult diapause in the Colorado potato beetle, Leptinotarsa decemlineata: effects of external factors on maintenance, termination and post-diapause development.
    Lefevere, K.S. ; Kort, C.A.D. de - \ 1989
    Physiological Entomology 14 (1989). - ISSN 0307-6962 - p. 299 - 308.
    Endocrine control of diapause termination in the adult female Colorado potato beetle, Leptinotarsa decemlineata.
    Lefevere, K.S. - \ 1989
    Journal of Insect Physiology 35 (1989). - ISSN 0022-1910 - p. 197 - 203.
    Changes in the concentrations of metabolites in haemolymph during and after diapause in female colorado potato beetle, Leptinotarsa decemlineata.
    Lefevere, K.S. ; Koopmanschap, A.B. ; Kort, C.A.D. de - \ 1989
    Journal of Insect Physiology 35 (1989). - ISSN 0022-1910 - p. 121 - 128.
    Juvenile hormone metabolism during and after diapause in the female colorado potato beetle, Leptinotarsa decemlineata.
    Lefevere, K.S. ; Koopmanschap, A.B. ; Kort, C.A.D. de - \ 1989
    Journal of Insect Physiology 35 (1989). - ISSN 0022-1910 - p. 129 - 135.
    Extrinsic and intrinsic control of diapause termination in the Colorado potato beetle
    Lefevere, K.S. - \ 1988
    Agricultural University. Promotor(en): L.M. Schoonhoven; C.A.D. de Kort. - S.l. : Lefevere - 120
    Chrysomelidae - diapauze - hibernatie - aestivatie - Chrysomelidae - diapause - hibernation - aestivation
    The adult Leptinotarsadecemlineata enters a winter diapause, which is mainly induced by short photoperiod. The effects of environmental factors (such as temperature, humidity, daylength and food) on the behaviour and the metabolism of some haemolymph components, as for example the juvenile hormone, were analysed in diapausing and post- diapausing females. During diapause three consecutive phases could be distinguished, based on changing response to temperature: 'diapause development' or true diapause, followed by a quiescence which is facultative, and a transient phase of post-diapause development leading to emergence from the soil (or diapause termination). After diapause, high metabolic rates are resumed and postdiapause development culminates in reproduction. The endocrine control of the termination of diapause was investigated by means of hormonal injections. Only the combined injections of 20-hydroxyecdysone and juvenile caused a temporary break of diapause only, lasting as long as the JH titre in haemolymph was high. 20-Hydroxyecdysone (20-HE) injected before JH suppresses the effects of exogenous JH on the endogenous metabolism of JH. It is suggested that 20-HE could be responsible for triggering the programme for diapause termination by the brain. Allatectomy experiments after diapause confirm the role of JH in reproduction and reveal the endocrine control of the Induction of a second diapause. The presented results corroborate the theory that the brain is the primary organ controlling diapause.

    Effect of photoperiod and allatectomy on reproduction and (second) diapause induction in post-diapause adult females of the Colorado potato beetle, L. deceml
    Lefevere, K.S. ; Wilde, J. de - \ 1984
    International journal of invertebrate reproduction and development 7 (1984). - p. 69 - 72.
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