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United States Department of Agriculture

Agricultural Research Service

Research Project: Control of Powdery Scab and Black Dot Through Resistance Breeding and Pathogen Management Strategies (WSU-Johnson)


2011 Annual Report

1a. Objectives (from AD-416)
Screen potato germplasm resistance for resistance to major pests and pathogens. Test management strategies and their interaction with different levels of host resistance.

1b. Approach (from AD-416)
Plant various genotypes of potato in affected fields infested with major pests and pathogens. Score resistance reactions. Where appropriate find linkages between resistance and molecular markers. Test management strategies and study interactions with different levels of resistance in potato breeding lines and cultivars.

3. Progress Report
Powdery scab and black dot are emerging diseases which lower the yield in the Columbia Basin. Finding host resistance is the best strategy as no chemical means has been found to control either disease. Among other germplasm studies the most notable feature of resistance germplasm is that it produces a large root system. By selecting for large root systems in the face of fungal challenge we will identify additional resistant hosts. Sage Russet has been found to be a suitable clone for the infested fields. Use of this variety on infested fields would add five million dollars to farmgate income in the Columbia Basin. We have been making progress in the definition of resistance. This project is related to objective 1b of the parent project through identification of resistance that is expressed over several years. The project is monitored by telephone, by email and through face-to-face discussions at Washington State Potato Commission Meetings.

4. Accomplishments

Last Modified: 07/21/2017
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