Using pupal parasitoids for biological control of Drosophila suzukii in berry fruit cultivation: Do pesticides and temperature extremes affect parasitoids’ performance?

Abstract: The spotted-wing drosophila, Drosophila suzukii, is a significant threat to European stone fruit and berry production. The “ParaDrosu” project strives to develop a biological control strategy utilizing two native German parasitoid species: Trichopria drosophilae and Pachycrepoideus vindemiae. Key aspects are examined, including mass rearing, climatic suitability, pesticide compatibility, and application techniques. Here, we report on the in vitro evaluation of organic plant protection products and extreme temperature scenarios on parasitoids’ lifespan and parasitization rate. A field trial was performed in 2022 and 2023 to evaluate parasitoid dispersal and efficacy to parasitize bait traps. The findings demonstrate the potential for biological control of D. suzukii, underscoring the need for further optimization and integration into pest management strategies.