METHOD: Feeding Behavior CONDITIONS: Green House and Field - 16h light at 20-26C and 60-90% RH METHOD NARR: Plants grown from seed were transfered to the field and assessed for field resistance. Selected plants were removed fromin the GH. PI 473331 had two siblings, one resistant and one susceptible, selected. Larvae were placed on excised leaflets and activities (walking, feeding, resting) were monitored for 5 minutes. In 24 and 72 hr leaf testsand inspected for evidence of feeding (24 hr) and survival (72 hr). F6 tbr x ber hybrids were also assessed. RESULTS NARR: Larvae that fed took as long to initiate feeding on tbr as on ber. The duration of feeding and % tion ber. Time spent resting was similar on all hosts. Feeding on ber was less than on tbr. In caged larvae, feeding was lowest on ber. Larvae developed significantly slower on ber. Larvae on the most resistant plants had the highesncasement by trichome exudate. AUTHOR EXPLANATION: Much of the resistance of ber is expressed by failure of newly hatched larvae to initiate feeding leading to starvation and death. High trichome density may deprive laface eliminating the appropriate cues for initiation of feeding. The relative resistance of the accessions follows: 310927>265858>473334>473331>tbr x ber hybrid>tbr cv. Katahdin