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oai:mountainscholar.org:10217/2361702026-03-26T16:14:44Zcom_10217_100532com_10217_100000com_10217_100453com_10217_100303col_10217_100538col_10217_100454

Houser, Andrew J., author Davidson, Robert D., advisor Wallner, Stephen, committee member Schwartz, Howard, committee member 2023-01-27T14:53:57Z 2023-01-27T14:53:57Z 2008 https://hdl.handle.net/10217/236170 https://doi.org/10.25675/3.018334 Covers not scanned. Potato resistance to powdery scab, caused by the protist Spongospora subterranea f. sp. subterranea (S.s.s.), has become extremely important in recent years due to the increased damage caused by this disease. Variable field conditions and the environmental sensitivity of the S.s.s. infection process in naturally infested fields have created difficulties in consistently evaluating potato germplasm resistance. A greenhouse assay for evaluating potato germplasm resistance which is consistent and compatible with field results was developed. Two soil types, three inoculum levels, two inoculum sources and two soil moisture regimes were evaluated in a greenhouse for powdery scab severity using four potato cultivars. Soil temperature was maintained at an ideal range for powdery scab development as reported in current literature. Greenhouse results were then compared with three years of fi eld data collected from field trials conducted in the San Luis Valley (SLV). Cultivars were evaluated for root galling, tuber lesion incidence, and severity. Soil with 50% sand, an inoculum level of one sporeball per gram of soil , and relatively high soil moisture (0-10 chars) had the most consistent symptom expression when compared with field results . This combination of factors was then tested m a greenhouse using fourteen potato cultivars which varied in levels of powdery scab susceptibility. A relative ranking system was also developed to compare greenhouse results with known SLY field results. Results demonstrated that a greenhouse assay can be used successfully for screening advanced potato germplasm for susceptibility to powdery scab. masters theses English eng Colorado State University. Libraries Catalog record number (MMS ID): 991009446939703361 SB608.P8H687 2008 2000-2019 Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. Potatoes -- Disease and pest resistance Potatoes -- Germplasm resources Powdery scab Development and testing of a greenhouse assay for screening potato germplasm for susceptibility to Spongospora subterranea f. sp. subterranea (powdery scab) Text StillImage Master of Science (M.S.) Masters Horticulture and Landscape Architecture Colorado State University This Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). open.access