METHOD: Mortality CONDITIONS: Field METHOD NARR: Adult and larval fitness were tested in field cage experiments. All cages were sampled multiple times per week to record mortality, sex, missing beetles, # of egg clutches and # oboratory tests using neonates were also conducted to track mortality and instar. RESULTS NARR: In Adult field cage experiments: mortality was 25% or less on tbr, ber and cap and varied from 30-70% on the other species. Nootal # of eggs laid was <15% of tbr for cap, jam, pnt, pld, trf with tar at 69% and ber at 43%. In Larval field cage experiments: 1st instar mortality was high in pld, pnt; moderate in jam, trf; low in ber, cap and tar. In theall larval mortality was higher on pld, pnt, trf and jam. Develpoment took longer on cap. Pnt was unique in that larval mortality was high but adult mortality relatively low. AUTHOR EXPLANATION: In the experiments presented, the rity of adults and larvae, the reduced oviposition, the low proportion of adults recovered 2d after release and the develpoment time similar to tbr indicate the presence of semiochemicals in ber. Factors providing resistancrom those in ber. Tar & ber may have a similar mode of resistance. In jam, pld and trf there may be substances interacting with insect physiology or as a feeding deterrent reducing or inhibiting food ingestion.