METHOD: Both ELISA and Visual Examination CONDITIONS: Green House METHOD NARR: Four viruses, 1 fungus and 1 nematode were used to test for resistance. Tubers were used except for non-tuber-bearing accessions. Viruses PVA,PVM anmechanically using carborundum, and PLRV was transmitted by apterous aphids. Symptoms were monitored visually and ELISA's were performed. Accessions identified as resistant were retested to confirm resistance. RESULTS NARRaccessions carried one or more resistances. AUTHOR EXPLANATION: All tubers obtained from one accession were bulked due to limited tuber production under given conditions. Therefore, the results can not be generalized to theof resistance are discussed. It is noted when the results obtained in this study do not match those of previous studies and explanations are offered.