Jonathan Whitworth1, Rich Novy1, Xiaohong Wang2, Walter De Jong3, Inga Zasada4, Louise-Marie Dandurand5, Joseph Kuhl5

1USDA-ARS, Aberdeen, Idaho; 2 USDA-ARS, Ithaca, New York; 3Cornell University, Ithaca, New York; 4USDA-ARS, Corvallis, Oregon; 5University of Idaho, Moscow, Idaho

Potato cyst nematodes (PCN) Globodera pallida and G. rostochiensis are currently controlled by quarantine measures in the U.S. and elsewhere. Development of host resistance in industry accepted varieties provides the best measure for sustained control of PCN. Earlier work by a collaborative group of nematologists and breeder/geneticists identified resistant varieties that could be used as parents to develop russet market type varieties. Research presented here shows current work that involves the introduction of new parental material, the pyramiding of genes to increase resistance to G. pallida, a focus on the Ro2 pathotype of G. rostochiensis, and includes work done with G. ellingtonae, a newly named species found in the U.S. that reproduces on potato but is not currently listed as a quarantine pest.