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Role of the predatory mites Amblyseius aberrans (Oud.), Typhlodromus pyri Scheuten and Amblyseius andersoni (Chant)(Acari, Phytoseiidae) in vineyards: I. The effects of single or mixed phytoseiid population releases on spider mite densities (Acari, Tetranychidae)
The perfect stage of Phloeosporella padi, the causal fungus of cherry leaf spot, in the Netherlands: Het perfecte stadium van Phloeosporella padi, de oorzaak van de kersebladvlekkenziekte, in Nederland