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United States Department of Agriculture

Agricultural Research Service

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Research Project: Identifying Resistance to Common Scab and Improving Disease Management

Location: Genetic Improvement for Fruits & Vegetables Laboratory

Project Number: 8042-21220-251-04-S
Project Type: Non-Assistance Cooperative Agreement

Start Date: Jul 20, 2009
End Date: Jul 19, 2014

Evaluate potential biologically active control measures in controlled conditions and the field. Monitor the location-specific variation in scab resistance of potato breeding material and newly released cultivars by field testing (national trials).

Potato seed pieces of three popular but scab-susceptible varieties (Yukon Gold, Ranger Russet and Atlantic) will be treated with several individual non-pathogenic isolates of Streptomyces, and planted in Pennsylvania and Michigan fields with high common scab pressure. Treatments will be planted in four replicates in a randomized block design, and evaluated at harvest for incidence and severity of common scab. A total of 20 newly-released potato cultivars and advanced breeding selections plus four popular cultivars as checks (Atlantic, Ranger Russet, Russet Burbank and Superior) will be tested in common scab nurseries in four locations, embodying a range of environmental conditions and different pathogen populations. Locations are in Aberdeen, ID, Becker, MN, E. Lansing, MI, and University Park, PA. A randomized complete block with three replications of four hills will be planted for each clone. At harvest, each tuber will be rated for percent surface area covered with lesions and type of lesion. Data from cooperating sites will be analyzed. The resulting comparison and ranking of susceptibility to predominant Streptomyces isolates will be made available to growers to help them select the most scab-resistant cultivars for their region.

Last Modified: 10/18/2017
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