EN
The article presents the fluctuation in Phyllonorycter platani population on plane trees in the urban area of Szczecin in 2005–2007. The species is well known in Europe for over 100 years. The first appearance of the pest was recorded in Poland in 1969. In the surrounding area of Szczecin P. platani was recorded in 1994. The result of presented studies revealed a decrease of the population of P. platani during the whole period of observation. In each year there was a slight increase in the number of insects, because of the developement of several pest generations yearly.