BioControl (2012) 57, 71-84

C.L. Raak-van den Berg, Lia Hemerik, Peter W. de Jong and Joop C. van Lenteren (2012)
Mode of overwintering of invasive Harmonia axyridis in the Netherlands
BioControl 57 (1), 71-84
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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Database assignments for author(s): C. Lidwien Raak-van den Berg, Joop C. van Lenteren

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
population dynamics/epizootiology
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Aphis gossypii		Netherlands
Harmonia axyridis (predator)	Aphis gossypii		Netherlands