{"id":{"repo_id":"cornell","oai_identifier":"oai:ecommons.cornell.edu:1813/115702"},"canonical_url":"https://search.dev.ndltd.org/etd/cornell/oai:ecommons.cornell.edu:1813/115702","repository":{"repo_id":"cornell","name":"Cornell University","base_url":"https://ecommons.cornell.edu/server/oai/request"},"display":{"title":"EPIDEMIOLOGY AND POPULATION GENETICS OF THE GRAPE POWDERY MILDEW CAUSAL FUNGUS, ERYSIPHE NECATOR, AND ITS RELATION TO COMMERCIAL DISEASE MANAGEMENT","abstract":"Erysiphe necator is the causal fungus of grapevine powdery mildew disease and is one of the most widespread and consistently problematic pathogens of grapevine worldwide. Imported Vitis vinifera are among the most commonly grown grape species worldwide and are highly susceptible to powdery mildew infection. In the Northeastern United States where this study takes place, E. necator exclusively overwinters in its sexual stage as chasmothecia. Having a diverse genetic pool and mixed mode of reproduction contributes to a high evolutionary potential to overcome disease management methods; powdery mildews have been shown numerous times to overcome host resistance and several fungicide groups within a couple years of deployment. For this study, Amplicon Sequencing (AmpSeq) was performed on 3,170 field samples of E. necator collected between 2015 and 2020 with multiple timepoints per season investigated starting in 2018. This dissertation addresses the following questions: i) How accurately can disease severity predict the clonality or aclonality of single colonies? ii) Can a disease-date threshold be identified, by which if severity doesn’t exceed a given level by a certain late Summer date, pathogen winter survival can be prevented? iii) At what frequency are known fungicide resistance mutations identified in commercially managed vs. unmanaged native vine populations? iv) Are commercial populations less genetically diverse than unmanaged populations due to genetic selection in the form of frequent fungicide exposure?","abstract_html":"Erysiphe necator is the causal fungus of grapevine powdery mildew disease and is one of the most widespread and consistently problematic pathogens of grapevine worldwide. Imported Vitis vinifera are among the most commonly grown grape species worldwide and are highly susceptible to powdery mildew infection. In the Northeastern United States where this study takes place, E. necator exclusively overwinters in its sexual stage as chasmothecia. Having a diverse genetic pool and mixed mode of reproduction contributes to a high evolutionary potential to overcome disease management methods; powdery mildews have been shown numerous times to overcome host resistance and several fungicide groups within a couple years of deployment. For this study, Amplicon Sequencing (AmpSeq) was performed on 3,170 field samples of E. necator collected between 2015 and 2020 with multiple timepoints per season investigated starting in 2018. This dissertation addresses the following questions: i) How accurately can disease severity predict the clonality or aclonality of single colonies? ii) Can a disease-date threshold be identified, by which if severity doesn’t exceed a given level by a certain late Summer date, pathogen winter survival can be prevented? iii) At what frequency are known fungicide resistance mutations identified in commercially managed vs. unmanaged native vine populations? iv) Are commercial populations less genetically diverse than unmanaged populations due to genetic selection in the form of frequent fungicide exposure?","abstract_has_math":false,"creators":["Kisselstein, Breanne"],"institution":"Cornell University","degree_name":"Ph. D., Plant Pathology and Plant-Microbe Biology","degree_level":"Doctor of Philosophy","degree_discipline":"Plant Pathology and Plant-Microbe Biology","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":["Cadle-Davidson, Lance","Reisch, Bruce","Messer, Philipp"],"year":2023,"date_issued":"2023-12","date_published":"2023-12","updated_at":"2026-07-24T01:49:02Z","subjects":["epidemiology","grapevine","plant pathology","population genetics","powdery mildew","vitis"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.doi","label":"DOI","values":["http://doi.org/10.7298/0smk-3660"],"render_values":[{"text":"http://doi.org/10.7298/0smk-3660","href":"http://doi.org/10.7298/0smk-3660","code":true}]},{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["ProQuest Submission ID: 14115","ProQuest Publication ID: 30814152"],"render_values":[{"text":"ProQuest Submission ID: 14115","href":null,"code":true},{"text":"ProQuest Publication ID: 30814152","href":null,"code":true}]}]},"links":{"outbound_url":"https://hdl.handle.net/1813/115702","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Cadle-Davidson, Lance","Reisch, Bruce","Messer, Philipp"]},{"key":"dc:creator","label":"Author","values":["Kisselstein, Breanne"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2024-10-16T20:19:23Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2024-10-16T20:19:23Z"]},{"key":"dc:date.issued","label":"Date","values":["2023-12"]},{"key":"dc:type","label":"Dc Type","values":["dissertation or thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Plant Pathology and Plant-Microbe Biology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Doctor of Philosophy"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph. D., Plant Pathology and Plant-Microbe Biology"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Cornell University"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["epidemiology","grapevine","plant pathology","population genetics","powdery mildew","vitis"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.doi","label":"DOI","values":["http://doi.org/10.7298/0smk-3660"]},{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["ProQuest Submission ID: 14115","ProQuest Publication ID: 30814152"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/1813/115702"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["182 pages"]},{"key":"dc:description.abstract","label":"Abstract","values":["Erysiphe necator is the causal fungus of grapevine powdery mildew disease and is one of the most widespread and consistently problematic pathogens of grapevine worldwide. Imported Vitis vinifera are among the most commonly grown grape species worldwide and are highly susceptible to powdery mildew infection. In the Northeastern United States where this study takes place, E. necator exclusively overwinters in its sexual stage as chasmothecia. Having a diverse genetic pool and mixed mode of reproduction contributes to a high evolutionary potential to overcome disease management methods; powdery mildews have been shown numerous times to overcome host resistance and several fungicide groups within a couple years of deployment. For this study, Amplicon Sequencing (AmpSeq) was performed on 3,170 field samples of E. necator collected between 2015 and 2020 with multiple timepoints per season investigated starting in 2018. This dissertation addresses the following questions: i) How accurately can disease severity predict the clonality or aclonality of single colonies? ii) Can a disease-date threshold be identified, by which if severity doesn’t exceed a given level by a certain late Summer date, pathogen winter survival can be prevented? iii) At what frequency are known fungicide resistance mutations identified in commercially managed vs. unmanaged native vine populations? iv) Are commercial populations less genetically diverse than unmanaged populations due to genetic selection in the form of frequent fungicide exposure?"]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["EPIDEMIOLOGY AND POPULATION GENETICS OF THE GRAPE POWDERY MILDEW CAUSAL FUNGUS, ERYSIPHE NECATOR, AND ITS RELATION TO COMMERCIAL DISEASE MANAGEMENT"]}]}],"canonical_facts":{"dc:contributor.committeemember":["Cadle-Davidson, Lance","Reisch, Bruce","Messer, Philipp"],"dc:creator":["Kisselstein, Breanne"],"dc:date.accessioned":["2024-10-16T20:19:23Z"],"dc:date.available":["2024-10-16T20:19:23Z"],"dc:date.issued":["2023-12"],"dc:description":["182 pages"],"dc:description.abstract":["Erysiphe necator is the causal fungus of grapevine powdery mildew disease and is one of the most widespread and consistently problematic pathogens of grapevine worldwide. Imported Vitis vinifera are among the most commonly grown grape species worldwide and are highly susceptible to powdery mildew infection. In the Northeastern United States where this study takes place, E. necator exclusively overwinters in its sexual stage as chasmothecia. Having a diverse genetic pool and mixed mode of reproduction contributes to a high evolutionary potential to overcome disease management methods; powdery mildews have been shown numerous times to overcome host resistance and several fungicide groups within a couple years of deployment. For this study, Amplicon Sequencing (AmpSeq) was performed on 3,170 field samples of E. necator collected between 2015 and 2020 with multiple timepoints per season investigated starting in 2018. This dissertation addresses the following questions: i) How accurately can disease severity predict the clonality or aclonality of single colonies? ii) Can a disease-date threshold be identified, by which if severity doesn’t exceed a given level by a certain late Summer date, pathogen winter survival can be prevented? iii) At what frequency are known fungicide resistance mutations identified in commercially managed vs. unmanaged native vine populations? iv) Are commercial populations less genetically diverse than unmanaged populations due to genetic selection in the form of frequent fungicide exposure?"],"dc:format.mimetype":["application/pdf"],"dc:identifier.doi":["http://doi.org/10.7298/0smk-3660"],"dc:identifier.other":["ProQuest Submission ID: 14115","ProQuest Publication ID: 30814152"],"dc:identifier.uri":["https://hdl.handle.net/1813/115702"],"dc:language.iso":["en"],"dc:subject":["epidemiology","grapevine","plant pathology","population genetics","powdery mildew","vitis"],"dc:title":["EPIDEMIOLOGY AND POPULATION GENETICS OF THE GRAPE POWDERY MILDEW CAUSAL FUNGUS, ERYSIPHE NECATOR, AND ITS RELATION TO COMMERCIAL DISEASE MANAGEMENT"],"dc:type":["dissertation or thesis"],"thesis:degree_discipline":["Plant Pathology and Plant-Microbe Biology"],"thesis:degree_level":["Doctor of Philosophy"],"thesis:degree_name":["Ph. D., Plant Pathology and Plant-Microbe Biology"],"thesis:institution_name":["Cornell University"]},"updated_at":"2026-07-24T01:49:02Z"}