Abstract
Abstract: A total of 78 insect species were recorded as damaging plant organs (galls, mines and eaten leaves) on nine Quercus species in south‐western Slovakia during 1987–1992. The insects belong to five orders: 41 species of Hymenoptera, 16 species of Lepidoptera, 13 species of Diptera, two species of Coleoptera and five species of Homoptera. In addition, galls of Eriophyes cerreus (Eriophyidae, Acari) were found. The following species were abundant: Andricus kollari (Htg.), A. lignicola (Htg.), A. lucida (Htg.), Neuroterus quercusbaccarum (L.), Biorrhiza pallida (Oliv.) (Hym., Cynipidae) and Periclista lineolata (Klug) (Hym., Tenthredinidae); Tischeria ekebladella (Bjerk.) (Lep., Tischeriidae) and Phyllonorycter (Lithocolletis) roboris Zll. (Lepidoptera, Gracillariidae); Haltica quercetorum Foundr. (Col., Chrysomelidae). The number of insect species moderately oscillated and changed during 1987–1992. The lowest number (35 species) was found in 1991, the highest (48 species) in 1989. The highest number, 42 insect species, was associated with Quercus cerris, the lowest (25 species) with Q. pubescens. Insect species caused a total of 6356 galls, mines and other types of damage on nine Quercus species. Insect species were evaluated according to degree of harmfulness.
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