Field plots were artificially infested with neonate tobacco budworm larvae at 6 different densities on 6 different weeks during 1997. The plots were subsequently monitored for larval survival. When all bolls had opened at the end of the season, the weight of fruit produced by individual locations on the plant was recorded, and same age fruit was grouped as cohorts. Low survival of artificial infestations limited the interpretation of the data. However, the data did indicate that if larvae do have time to establish, the end of season plant mapping could be used to evaluate the effect on individual cohorts.