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Western flower thrips, Frankliniella occidentalis, is a major pest species in greenhouse ornamental crops. They cause damage to leaves and flowers and can transmit viruses. Effective control requires a systems approach where measures that increase plant resilience are combined with biological control, mass trapping and (bio) pesticides. Het aim of this project with the title “Master plan thrips management in greenhouse ornamental crops” was to develop enhanced thrips control measures through 1) increased plant resilience with fungal endophytes, 2) preventive releases of natural enemies (standing army) and 3) manipulation of thrips behaviour. This report presents the results of this project that was done in the period 2015-2019.