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In four years’ experiment the infestation of hazel nuts by hazelnut weevil was investigated. Significant differences in resistance of different hazelnut cultivars were found. Olbrzymi z Halle cultivar exhibited a moderate resistance to the pest and was classified to the III class, while other cultivars showed a moderate susceptibility to the pest and were classified to class IV.
The aim of the study was to recognise the species composition of beetles (Coleoptera) population occurring on hazel shrubs. Three-year studies were carried out on three ecosystems: on the cultivated hazelnut plantation, on an unprotected one and on shrubs of common hazel in the forest. The presence of 63 species was detected. The smallest number of species (22) and individuals (535) was noted in the...
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