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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Record number 408953
Title Mode of overwintering of invasive Harmonia axyridis in the Netherlands
Author(s) Raak-van den Berg, C.L.; Hemerik, L.; Jong, P.W. de; Lenteren, J.C. van
Source BioControl 57 (2012)1. - ISSN 1386-6141 - p. 71 - 84.
Department(s) Laboratory of Entomology
Biometris (WU MAT)
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) coccinella-septempunctata coleoptera - temperature-dependent development - hippodamia-convergens coleoptera - adalia-bipunctata coleoptera - lady beetle coleoptera - thermal requirements - pallas coleoptera - life-history - photoperiodic response - reproductive di
Abstract After establishment of Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae) in Europe, population densities of native ladybird species have decreased. The post-hibernation onset of female reproduction, a key characteristic influencing population dynamics and competition with related species, was studied. Hibernating individuals were collected and transferred to outdoor cages to continue overwintering. Every two weeks a sample of individuals was transferred to long-day, warm conditions. Intensity of dormancy was studied by determining the pre-oviposition period and ovarian development. Pre-oviposition periods were short throughout our observations, indicating that Harmonia axyridis was not in diapause but in a quiescent state. H. axyridis becomes active rapidly when temperature rises in spring but is not active earlier in the year than native species. Neither the mode of overwintering, nor the onset of spring activity can explain the invasion success of H. axyridis
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