METHOD: Test Diet CONDITIONS: Green House and Lab METHOD NARR: In a study by Sinden et al 1986, high and low leptine clones of chacoense accessions were identified. The current work is a continuation and uses some of these clonlyses were performed. Adult CPBs were used in infest field plots. The # of adults and degree of feeding damage to the plants was measured. Adult feeding rates were measured using leaf disks, and larval development was meaESULTS NARR: Chc217451 with high levels of commersonine and demissine had the fewest adults and least feeding damage. The most susceptible clone was 320287 and the most resistant was 458313. Leaf Disk Test: feeding was deterrelated with leptine content. Larval Development: Differences in weights, development and survival on high vs low leptine clones were significant. AUTHOR EXPLANATION: High and low leptine sibs were compared. Those with high levelmore resistant than the average clone. The low to mid range sibs better represented the average chacoense clone in leptine level and resistance. The highest leptine level clones are highly resistant to larvae and nearly