Abstract
This paper presents the results of observations on the occurrence of Tetranychidae. During the 1995-2001 investigations, 10 species, namely Bryobia praetiosa, Eotetranychus carpini, E. coryli, E. pruni, E. tiliarium, Eurytetranychus buxi, Panonychus ulmi, Schizotetranychus schizopus, Tetranychus viennensis [Amphitetranychus viennensis] and T. urticae were collected in ornamental nurseries in Poland. T. urticae was the most frequent species of mites and it was found on 60 different species of plants belonging to 17 families. This species caused severe damage on Spiraea japonica, Ulmus minor cv. Jacqueline Hillier, Magnolia spp., Buddleja davidii, Sambucus nigra, Laburnum xwatererii [L. watereri] and Daphne mezereum. Among other tetranychids, S. schizopus is also a dangerous pest of grafted willows.
