Abstract
The within tree distribution of some common natural enemies of bark beetles in pine plantations in Israel and some aspects of their feeding habits were studied with special emphasis on the potential impact on the predatorAulonium ruficorne Olivier. A total of 12 predators and 2 parasite species were found associated withA. ruficorne in the natural enemy complex of bark beetles on pines. No secondary parasites were detected. The anthocoridScoloposcelis pulchella (Zetterstedt) and the dipteranMedetera striata Parent were observed feeding on immature stages ofA. ruficorne in the absence of scolytids. The associated Coleoptea:Nemosema elongatum F.,Rhizophagus bipustulatus L.,Corticeus spp.,Plastysoma spp. andPlegaderus discisus Erickson are thought to compete withA. ruficorne on larvae and pupae of bark beetles when the latter are in limited quantities (especially in the lower section of the tree). The parasites, mainlyMetacolus unifasciatuss Forster andDendrosoter caenopachoides Ruschka are assumed to compete withA. ruficorne during the larval period in the smooth bark section of the stem. Competition might occur mainly during spring and fall. Deutonymphs of the miteIpiduropoda sellnicki were detected on the abdomen ofA. ruficorne adults. Larvae of the predator were rarely infected in the field by the bacteriaSerratia sp. while laboratory cultures suffered high rate of mortality caused by this pathogen.
Résumé
La distribution à l'intŕieur de l'arbre de quelques ennemis naturels communs des Scolytes des plantations de pins d'Israël et quelques aspects de leur alimentation ont été étudiés en insistant tout spécialement sur l'impact potentiel du prédateurAulonium ruficorne Olivier. Au total, 12 espèces de prédateurs et 2 de parasites ont été trouvées associées àA. ruficorne dans le complexe des ennemis naturels des Scolytes sur pins. Aucun parasite secondaire n'a été détecté. On a observé l'anthocoride:Scoloposcelis pulchella (zetterstedt) et le diptèreMedetera spp. se nourrissant, en l'absence de Scolytes, sur les stades immatures d'A. ruficorne. On pense que les Coléoptères associés:Nemosema elongatum F.,Rhizophagus bipustulatus L.,Corticeus spp.,Platysoma spp. etPlegaderus discisus Erickson entrent en compétition avecA. ruficorne sur les larves et les pupes de scolytes quand ceux-ci sont en quantités limitées (spécialement dans la partie inférieure du tronc). On suppose que, principalementMetacolus unifasciatus Forster etDendrosoter caenopacheides Ruschka entrent en compétition avecA. ruficorne durant la période larvaire dans la partie lisse de l'écorce du rameau. La compétition peut avoir lieu principalement durant le printemps et l'automne. Des deutonymphes de l'AcarienIpiduropoda sellnicki ont été détectées sur l'abdomen des adultes d'A. ruficorne. Les larves du prédateur ont été rarement infectées dans les champs par la bactérieSerratia sp. tandis que les élevages de laboratoire manifestaient une très forte mortalité due à ce pathogène.
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Mendel, Z., Podoler, H. & Livne, H. Interactions betweenAulonium ruficorne [Coleoptera: Colydiidae] and other natural enemies of bark beetles [Coleoptera: Scolytidae]. Entomophaga 35, 99–105 (1990). https://doi.org/10.1007/BF02374306
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DOI: https://doi.org/10.1007/BF02374306