Late blight (LB) caused by the oomycete is one of the most important biotic constraints for potato production worldwide. This study assessed 508 accessions (79 wild potato species and 429 landraces from a cultivated core collection) held at the International Potato Center genebank for resistance to LB. One isolate belonging to the EC-1 lineage, which is currently the predominant type of in Peru, Ecuador, and Colombia, was used in whole plant assays under greenhouse conditions.
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