Abstract
Studies on the species composition of galls occurring on the leaves of Carpinus betulus L. were conducted in 2001 in the following three localities: the Wolski Forest, the Ojcow National Park and the Krzeszowice Forest District (UTM-DA-16). A total of 1852 galls were found. The galls were caused by insect or mite species. Aceria macrotricha (NALEPA, 1919) was the most abundant species. The index of occurrence frequency and the Agrell index of species association have been calculated.
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