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Despite intensive chemical plant protection conducted in ornamental nurseries in Poland, spider mites are still one of problematic pests. In view of increasing resistance of spider mites on acaricides, searching for alternative methods of nursery plants protection against those pests, seems to be reasonable. In this work it was important to find out which cultivars of Norway spruce grown in nurseries are threaten by infestation by large amounts of spider mites and to verified if and which species of phytoseiid mites occur on spruces grown in chemical protected nurseries. Density and species composition of tetranychid and phytoseiid mites were also investigated on Norway spruces growing in forests. Our investigations showed that, almost all cultivars of Norway spruce that are offered for sale in nurseries are inhabited by spider mites. Cultivars ‘Inversa’, ‘Remontii’, ‘Waldbrund’, ‘Nidiformis’ or ‘Pumila Glauca’ were identified as especially threatened with massive infestation by those pests. Also some predatory mites, such as Typhlodromus tiliae Oudemans, were observed in nurseries, but their density was several times lower than on spruces growing in natural conditions. Additionally in forests we observed also Anthoseius bakeri (Garman) and Amblyseius andersoni (Chant).
Experiments involving the predatory mite Amblyseius andersoni Chant were carried out in the 2009 growing season from May to September. A. andersoni as a species chosen to detailed plot studies was selected on the basis of 2007–2008 observations conducted on strawberry commercial plantations. The model plants used in the study were: strawberry (Fragaria x ananassa Duchesne) cv. Honeoye and herb bennet (Geum urbanum L.). The aim of this experiment was to evaluate the biological efficiency of A. andersoni, as a predator of two-spotted spider mite (Tetranychus urticae Koch) using the dispersion model. On plants surrounding plantations were found eleven species from the family Phytoseiidae, and three were of them dominant species: N. reductus, A. andersoni, E. finlandicus and together they accounted for more than 70%. The plot studies showed that A. andersoni was an effective native predatory mite of the two-spotted spider mite on strawberries plants.
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