METHOD: Leaf disc bioassay CONDITIONS: Green House METHOD NARR: Four viruses, 1 fungus and 1 nematode were used to test for resistance. P. infestans resistance screening was a quantitative leaf disc bioassay according to Leona1992). Leaflets were collected from 12 week old plants. Inoculum from all available isolates was adjusted for sporangia and zoospore content and mixed. Leaf discs were inoculated with 40ul of suspension and incubated at 17 Resistant = <10% of leaf disc surface infected. Partially resistant = 10-20% of leaf disc surface infected. Accessions identified as resistant were retested to confirm resistance. RESULTS NARR: Over 70% of all evaluated are 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 the whole accession. Patterns of resis It is noted when the results obtained in this study do not match those of previous studies and explanations are offered.