In the present contribution two species of butterflies are presented, the brown oak tortrix (Archips xylosteana) and oak miner (Tischeria ekebladella), a number of species of the genus Phylloxera of oaks which cause shrivelling ofthe leaves and three species of Hymenoptera - oak slug sawfly (Caliroa annulipes), Apethymus abdominalis and Apethymus braccatus - which eat oak leaves. We state that in the last years the species A. xylosteana, T. ekebladella, Phylloxerra spp. and Caliroa annulipes are appearing frequently as forest pests in our forests. A short description of the insects' morphology, bionomy, a description of damage, possible misidentifications, hosts, the insects' most important natural enemies and their threat to forestsare given.
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