Drosophila suzukii attacks economically relevant berry crops and stone fruits. How the flies detect fruit and select their oviposition sites is not fully understood. We work mainly on raspberry and blueberry systems to recognize factors that determine fruits as a suitable substrate for the flies. Fruit not only is a substrate for D. suzukii but also provides a habitat for microorganisms such as yeasts and molds that influence fruit quality. Understanding the ecological factors that determine fruit quality is of horticultural interest, both from a food industrial perspective as well as for the development of pest control.