The studies were conducted in the years 2002-2004 on Juniperus communis L., Picea pungens Engelm. 'Glauca' and Pinus mugo Turra. They found out the presence of 5 aphid species: Cinara juniperi De Geer, Elatobium abietinum Walk., Cinara pilicornis Hartig, Cinara pini L. and
Schizolachnus pineti (F.). They belong to two families: Aphididae (1 species) and Lachnidae (4 species). Cinara pini L. colonized the shrubs of P. mugo in much greater numbers in the street site in every year of study. The other species presented variable changeability in particular sites, depending on the year. The most numerous species was Elatobium abietinum Walk. while Schizolachnus pineti (F.) occurred the least numerous. Feeding of the aphids caused different injuries, like browning and drying out of the needles or the weakening of plants.
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