In the present contribution six insect species and one mite species which are relatively common in our forests are presented. On several locations outbreaksof Miramella irena were noted, likewise of the beech weevil (Rhynchaenus fagi). The woolly beech aphid (Phyllaphis fagi) is always presentin beech stands in low abundance. The next insects presented are the butterfly - leaf miner (Phyllonorycter maestingella) and two species of flies (Mikiola fagi, Hartigiola annulipes) which cause zoocecidias on the upper partof beech leaves. The latter two species frequently accompany our beech stands. The mite species (Aceria nervisequa nervisequa) is also presented, which often appears on European beech, also in urban areas. A short description of the insects' and mites' morphology, bionomy, a description of damage, possible misidentifications, hosts, the insects' and mites' most important natural enemies and the threat to forests are given.
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