Field-collected male and female northern strain plum curculio (Conotrachelus nenuphar Herbst) were studied in laboratory bioassay chambers to better understand the relationship between weevil feeding/oviposition and Montmorency tart cherry developmental phenology. Bioassays were conducted with both the reproductive and the diapause bound generation. Reproductive-generation plum curculio individuals were presented with stems, leaves, and fruits (or flowers) collected from orchard trees at four periods from bloom through harvest (May-July 2006). Assays with the diapause-bound generation contained stems, leaves and fruits (if available) from harvest and two post-harvest intervals (August and September 2006). Males and females showed different trends in feeding rates and tissue preferences, and these preferences changed as the beetles and plant tissues matured. Some compounds available for plum curculio control require ingestion for maximal activity, and these data suggest key periods when such chemistries would have their greatest impact on the pest population.