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United States Department of Agriculture

Agricultural Research Service


item Novy, Richard - Rich
item Love, S.
item Corsini, Dennis
item Pavek, Joseph
item Whitworth, Jonathan
item Mosley, A.
item James, S.
item Hane, D.
item Shock, C.
item Rykbost, R.
item Brown, Catherine
item Thornton, R.
item Knowles, N.
item Pavek, M.
item Olsen, N.
item Inglis, D.

Submitted to: American Journal of Potato Research
Publication Type: Peer reviewed journal
Publication Acceptance Date: 7/21/2005
Publication Date: 1/1/2006
Citation: Novy, R.G., Love, S.L., Corsini, D.L., Pavek, J.J., Whitworth, J.L., Mosley, A.R., James, S.R., Hane, D.C., Shock, C.C., Rykbost, R.Y., Brown, C.R., Thornton, R.E., Knowles, N.R., Pavek, M.J., Olsen, N., Inglis, D.A. 2006. Defender: a high-yielding, processing potato cultivar with foliar and tuber resistance to late blight. American Journal of Potato Research.83(1):126

Interpretive Summary:

Technical Abstract: Potato cultivar ‘Defender’ has resistance to both foliar and tuber infection by newer genotypes of Phytophthora infestans. Resistance was derived from its Polish parent, KSA195-90. Released in 2004, Defender is high yielding, white-skinned, and suitable for processing into frozen potato products directly from the field or from storage. In seven late blight field trials conducted over a five-year period, progression of late blight in foliage of Defender was reduced by 73-75% relative to industry standard cultivars. In controlled laboratory tests for tuber blight resistance, Defender averaged <1.5% external tuber rot when challenged with US-8 or US-11 isolates of P. infestans whereas ‘Ranger Russet’ averaged 62% in the same evaluations. Defender is also resistant to tuber early blight, PVX, and net necrosis and has moderate resistance to Verticillium wilt, pink rot, foliar early blight, PVY, corky ringspot, and Erwinia soft rot. Primary weaknesses of Defender include blackspot susceptibility similar to its paternal parent, ‘Ranger Russet’, and susceptibilities to common scab, tuber greening, and internal necrosis. Disease resistances make Defender an ideal candidate for organic potato production.

Last Modified: 8/24/2016
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