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Resistance to Root Galling Caused by the Powdery Scab Pathogen Spongospora subterranea in Potato

December 2008 , Volume 92 , Number  12
Pages  1,643 - 1,649

Nadav Nitzan, USDA-ARS, Prosser, WA 99350; Tom F. Cummings and Dennis A. Johnson, Washington State University, Pullman, WA 99164; Jeff S. Miller, Miller Research, LCC., Rupert, ID 83350; Dallas L. Batchelor, Weather Or Not, Pasco, WA 99301; Chris Olsen, L.J. Olsen, Inc., Othello, WA 99344; Richard A. Quick and Charles R. Brown, USDA-ARS, Prosser, WA 99350

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Accepted for publication 17 August 2008.

Potato (Solanum tuberosum) selections (clones and commercial cultivars) were examined for resistance to root galling, caused by the powdery scab pathogen Spongospora subterranea f. sp. subterranea in seven field trials conducted between 2003 and 2007 in the states of Washington and Idaho. Four industry reference cultivars—Shepody, Russet Burbank, Russet Ranger, and Umatilla Russet—were used as susceptible standards. Every year, selections less susceptible than the standards were considered resistant and progressed to the next season. Selections that did not demonstrate resistance in at least two consecutive trials were discarded. Eight potato selections were more resistant to root galling than the susceptible standards in two or more trials: PA98NM38-1 was more resistant than the susceptible standards in 5 of 5 trials, PO94A009-10 in 4 of 5 trials, PA95B2-4 and PA98N5-2 in 3 of 5 trials, POR00HG5-1 in 2 of 5 trials, PO94A009-7 in 3 of 4 trials, PO94A012-2 in 2 of 3 trials, and Summit Russet in 2 of 2 trials. POR00HG5-1 has Solanum hougasii in its ancestry, while the other selections have the Mexican wild species Solanum bulbocastanum and the commercial cultivar Summit Russet appearing in their ancestry. Summit Russet is the most plausible source of resistance.

© 2008 The American Phytopathological Society