Eur. J. Entomol. 108 (4): 603-608, 2011 | 10.14411/eje.2011.078

Chilocorus renipustulatus (Coleoptera: Coccinellidae) dominates predatory ladybird assemblages on Sorbus aucuparia (Rosales: Rosaceae)

Emanuel KULA1, Oldøich NEDVĖD2,3
1 Faculty of Forestry and Wood Technology, Mendel University in Brno, Zemėdėlská 3, 613 00 Brno, Czech Republic; e-mail: kula@mendelu.cz
2 Faculty of Science, University of South Bohemia, and
3 Institute of Entomology, Biology Center, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budėjovice, Czech Republic; e-mail: nedved@prf.jcu.cz

Fourteen predatory species of ladybirds (Coleoptera: Coccinellidae) were collected from May to October 2008 from mountain ash (Sorbus aucuparia) infested with the scale insect Chionaspis salicis at 31 localities in the Ore Mountains, northern Bohemia, Czech Republic. Chilocorus renipustulatus, usually a rare species, made up 85% of the individuals collected (1690). Other abundant species were Coccinella septempunctata, Calvia quatuordecimguttata, Adalia bipunctata and Adalia decempunctata. The invasive alien Harmonia axyridis was present but made up less than one per cent of the individuals collected. Niche overlap between pairs of ladybird species measured in terms of the coefficient of community, Morisita's index and cluster analysis showed that microhabitat preferences were similar and hence the possibility of competition was high in two pairs of congeneric species (Chilocorus and Calvia). Larvae of Ch. renipustulatus were abundant from mid-June through August and were still present in October.

Keywords: Coccinellidae, Chilocorus renipustulatus, scale insect, mountain ash, Sorbus aucuparia, abundance, phenology, melanism

Received: February 9, 2011; Accepted: April 10, 2011; Published: October 3, 2011

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