The invasive fruit fly Drosophila suzukii is spreading in Sweden, from detection of only a few individuals in 2014, to damage in raspberry in 2015. Considering its multibillion € footprint in the EU and US, we urgently need to analyze the crops at risk, and establish measures to minimize spread and economic impact. For this we sorely need accurate monitoring. Current traps capture many insect species, which is too time consuming to sort manually. In the proposed research we will piggyback our extensive research on Drosophila and modify existing baits and traps to selectively trap D. suzukii for assessing spatio-temporally the occurrence of D. suzukii in commercial sites, as well as wild hosts. Wild hosts support population development until late autumn, winter survival and thus the size of the inoculum in spring. Our analyses will complement on-farm hygiene measures, protocols which are established through our collaborators at HIR Skåne and JBV.