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Larvae and adults of Korynetes caeruleus (de Geer 1775) (Coleoptera: Cleridae) were collected from old churches and reared in the laboratory on Anobium punctatum (de Geer 1774) (Coleoptera: Ptinidae). Breeding success of K. caeruleus was low, but basic parameters of this species’ developmental cycle were identifi ed. At 21°C and 75% relative humidity and a fourmonth cold period at 4°C, the development of K. caeruleus from egg to adult appearance lasted 2 years. The pupal stage may be reached and completed after one and a half years. Feeding on larvae of A. punctatum by larvae of K. caeruleus was observed and consisted of a combination of sucking haemolymph and consuming body parts. The sickle-like mandibles of larvae of K. caeruleus penetrate the cuticle of prey larvae; this is followed by pumping and sucking body movements. Adult beetles of A. punctatum were not attacked by K. caeruleus larvae. Feeding behaviour of adult K. caeruleus was not investigated. * Corresponding author; e-mail: ruediger.plarre@bam.de INTRODUCTION Biological control of pests is one cornerstone of Integrated Pest Management (IPM). To evaluate the potential of a predator as biological control agent of a pest species in the fi eld, autecological studies and reliable life history data of the benefi cial species are needed. Although several parasitoids and predators of wood boring pest insects are well known (Becker, 1954; Paul et al., 2008), their utilization in biological control to protect structural timbers, wooden furniture or art is still limited and unexploited (Steidle et al., 2007; Schöller, 2010; Schöller & Prozell, 2011; Auer & Kassel, 2014; Biebl & Auer, 2017; Querner, 2017). Major reason for this is the lack of detailed knowledge of their biology, absence of standard procedures for their mass rearing and reliable data on their pest control effi ciency (Haustein et al., 2014). Establishing a sustainable laboratory culture of benefi cial insects in order to determine their life histories is therefore an important prerequisite before promoting the use of classical biological control for the protection of wooden structures (Faulds, 1987; Reeve et al., 2003; Kassel et al., 2018). Korynetes caeruleus (de Geer 1775) (Coleoptera: Cleridae) is known to be a predator of wood boring anobiids, inEur. J. Entomol. 116: 362–371, 2019 doi: 10.14411/eje.2019.038

Laboratory breeding of Korynetes caeruleus (Coleoptera: Cleridae) for the biological control of Anobium punctatum (Coleoptera: Ptinidae)