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ARS Home » Pacific West Area » Aberdeen, Idaho » Small Grains and Potato Germplasm Research » Research » Research Project #440748

Research Project: Integrating Predictive Diagnostics and Disease Management Strategies for Powdery Scab and Potato Mop Top Virus in the Pacific Northwest

Location: Small Grains and Potato Germplasm Research

Project Number: 2050-21000-036-008-S
Project Type: Non-Assistance Cooperative Agreement

Start Date: Aug 1, 2021
End Date: Jun 30, 2023

1. Validate for diagnostic methods for S. subterranea and Potato Mop Top Virus (PMTV) and determine inoculum thresholds for disease. 2. Develop optimum sampling strategy for S. subterranea and PMTV for field soil. 3. Determine the relative importance of seed and soil-borne inoculum. 4. Evaluate integrated management strategies for the pathogen. 5. Create a decision support system integrating diagnostic results, chemical applications, varietal resistance and cultural methods.

In the field trials planned for 2021 and 2022, we will evaluate Omega and/or manganese for controlling powdery scab. A recent report (Falloon et al., 2020) showed than manganese levels potentially reduce the incidence and severity of powdery scab (Woodhall, Tanaka, Miller). Field trials with 8 varieties are planned for two locations using varieties and breeding lines that have shown some resistance to PMTV. One trial will be in SE Idaho in the Upper Snake River Valley and the other will be in southern Idaho in the Magic Valley area. Decision support system: A decision support system will be developed from data gathered in Years 1 to 3. This will be web based for the industry to use. Users will be able to enter the diagnostic result, field history and potato variety intended for use and a risk index will be provided with disease management suggestions. We will also write a set of best practices for powdery scab and PMTV management for both seed and commercial growers.