The paper presents the results of the isolation and identification of fungi from Quercus robur L. acorns infested by acorn major pests: Curculio glandium Marsh. and Kenneliola spp., and larvae of these insects. Acorns were collected in 2003, in three locations in Poland from the forest floor and from the nets suspended above the forest floor. The most frequently fungi isolated from acorns colonized by C. glandium was Alternaria alternata (Fr.) Keissl., and colonized by Kenneliola spp. were yeasts and A. alternata. Acorns collected from the nets were more often infected by A. alternata, Lecythophora sp., Pezicula cinnamomea (DC.) Sacc., Aspergillus and Cladosporium species, while acorns from the forest floor were often colonized by Ciboria batschiana (Zopf) N.F. Buchw. and species from Penicillium and Fusarium genera. The most frequently isolated fungi from C. glandium larvae were: Fusarium sporotrichioides Sherb., F. stilboides Wollenw., Penicillium spp. and Pestalotia clavispora Atk. and from Kenneliola spp. larvae were: A. alternata, F. sporotrichioides, Penicillium spp. and P. clavispora.

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