Duso, C. - Pozzebon, A. - Malagnini, V. (2006) Augmentative releases of beneficials in vineyards: factors affecting predatory mite (Acari: Phytoseiidae) persistence in the long-term period. [Contributo a convegno] In: Working Group on "Integrated Protection in Viticulture", 20-22 October 2005, Boario Terme (Italy).
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During the last years, phytoseiid mites were widely released on grapes to control phytophagous mites in North-eastern Italy. For a successful conservation biological control strategy, the improvement of conditions that allow predatory mite persistence is required. For a better understanding of factors involved in beneficial mite settlement, field observations in commercial vineyards were carried out during 15 years after the release of a Typhlodromus pyri strain, suspected to be resistant to organophosphates. The predatory mite colonized the vineyard and competed successfully with other species. The role of alternative food (pollen or downy mildew) availability, leaf morphology and selective pesticides for the predatory mite persistence is discussed.
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