David H. Gent
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View article: Automated detection and quantification of two-spotted spider mite life stages using computer vision for high-throughput in vitro assays
Automated detection and quantification of two-spotted spider mite life stages using computer vision for high-throughput in vitro assays Open
The two-spotted spider mite ( Tetranychus urticae Koch) is a globally significant agricultural pest with high reproductive capacity, rapid development, and frequent evolution of miticide resistance. Breeding and selection of resistant host…
View article: Automated detection and quantification of two-spotted spider mite life stages using computer vision for high-throughput <i>in vitro</i> assays
Automated detection and quantification of two-spotted spider mite life stages using computer vision for high-throughput <i>in vitro</i> assays Open
The two-spotted spider mite ( Tetranychus urticae Koch) is a globally significant agricultural pest with high reproductive capacity, rapid development, and frequent evolution of miticide resistance. Breeding and selection of resistant host…
View article: Pacific Northwest Hop Growers’ Attitudes and Perceptions Toward Sustainable Agriculture – A Mixed Methods Study
Pacific Northwest Hop Growers’ Attitudes and Perceptions Toward Sustainable Agriculture – A Mixed Methods Study Open
Facing stricter regulations on pesticide use in important export markets, stakeholders in the hop industry are seeking more long-term solutions with less dependency on agrichemical application while maintaining crop quality and productivit…
View article: Registration of ‘USDA‐ARS Vera’: A new public hop cultivar with tropical, stone‐fruit aroma and powdery mildew resistance
Registration of ‘USDA‐ARS Vera’: A new public hop cultivar with tropical, stone‐fruit aroma and powdery mildew resistance Open
Brewers are seeking new public hop ( Humulus lupulus L.) cultivars that exhibit desirable tropical and stone‐fruit aroma profiles for use in hop‐forward beer styles. ‘USDA‐ARS Vera’ (Reg. no. CV‐31, PI 707888) is a new hop developed in col…
View article: Seven publicly available hop genotypes with multi‐race powdery mildew resistance
Seven publicly available hop genotypes with multi‐race powdery mildew resistance Open
Resistance to powdery mildew (caused by Podosphaera macularis) is a primary objective for hop ( Humulus lupulus L.) breeding programs. However, selection efforts are challenged by the existence of multiple races and the pathogen's demonstr…
View article: Genomic Resources for <i>Fusarium sambucinum</i> , a Causal Agent of Fusarium Canker of Hop and Dry Rot of Potato
Genomic Resources for <i>Fusarium sambucinum</i> , a Causal Agent of Fusarium Canker of Hop and Dry Rot of Potato Open
Fusarium sambucinum is a plant pathogen involved in multiple pathosystems, including dry rot of potato ( Solanum tuberosum) and Fusarium canker of hop ( Humulus lupulus). As a causal agent of Fusarium canker, the pathogen is becoming incre…
View article: A Modified Disease Risk Index for Hop Powdery Mildew
A Modified Disease Risk Index for Hop Powdery Mildew Open
The hop powdery mildew fungus, Podosphaera macularis, has overcome host resistance when cultivars with a given form of genetic resistance are broadly deployed, as most recently experienced in the partially resistant hop cultivar Cascade. H…
View article: Plant-parasitic nematodes on hemp in the Pacific Northwest of the United States
Plant-parasitic nematodes on hemp in the Pacific Northwest of the United States Open
Background Plant-parasitic nematodes are one of the most important biotic factors that impact crop production globally. Since hemp cultivation in the U.S. was banned from 1970 to 2018, little information is available about current plant-pa…
View article: Genetic mapping and QTL analysis of multigenic resistance to powdery mildew (<i>Podosphaera macularis</i>) in hop (<i>Humulus lupulus</i> L.)
Genetic mapping and QTL analysis of multigenic resistance to powdery mildew (<i>Podosphaera macularis</i>) in hop (<i>Humulus lupulus</i> L.) Open
Hop powdery mildew (PM) ( Podosphaera macularis ) causes substantial losses if left uncontrolled. Most resistant hop cultivars possess qualitative resistance based on R ‐genes. One cultivar, Comet, has uncharacterized resistance that may b…
View article: Identifying highly connected sites for risk-based surveillance and control of cucurbit downy mildew in the eastern United States
Identifying highly connected sites for risk-based surveillance and control of cucurbit downy mildew in the eastern United States Open
Objective Surveillance is critical for the rapid implementation of control measures for diseases caused by aerially dispersed plant pathogens, but such programs can be resource-intensive, especially for epidemics caused by long-distance di…
View article: Free-Riding in Plant Health: A Social-Ecological Systems Approach to Collective Action
Free-Riding in Plant Health: A Social-Ecological Systems Approach to Collective Action Open
Plant disease epidemics often transcend land management boundaries, creating a collective-action problem where a group must cooperate in a common effort to maximize individual and group benefits. Drawing upon the social-ecological systems …
View article: Gene Expression Clusters Suggest Potential Mechanisms of Resistance to Powdery Mildew in Hop (<i>Humulus</i> <i>lupulus</i>)
Gene Expression Clusters Suggest Potential Mechanisms of Resistance to Powdery Mildew in Hop (<i>Humulus</i> <i>lupulus</i>) Open
Powdery mildew, caused by Podosphaera macularis, is one of the most important diseases of hop in the Pacific Northwest of the United States. Resistant cultivars exist; however, recently, the pathogen has overcome two sources of resistance …
View article: Characterization of Powdery Mildew Fungi Affecting Hemp in the Pacific Northwest
Characterization of Powdery Mildew Fungi Affecting Hemp in the Pacific Northwest Open
Hemp ( Cannabis sativa) is a new crop for Oregon and Washington. These states are also home to 90% of the country's hop ( Humulus lupulus) production. Powdery mildew is a common disease that affects both hemp and hop. There are at least tw…
View article: Characterization of <i>Podosphaera macularis</i> on the Most Prevalent Hop Genotype in the Pacific Northwest
Characterization of <i>Podosphaera macularis</i> on the Most Prevalent Hop Genotype in the Pacific Northwest Open
As of 2020, the hop cultivar ‘HBC 394’, trademarked name Citra brand, was the most widely planted hop cultivar in Washington, Oregon, and Idaho, with the acreage harvested in all three states nearly doubling from 2018 to 2020. This researc…
View article: Nitrogen and Sulfur Fertility Practices: Influences on Hop Chemistry, Aroma, and Nitrate Accumulation
Nitrogen and Sulfur Fertility Practices: Influences on Hop Chemistry, Aroma, and Nitrate Accumulation Open
Multiphasic studies were conducted to quantify how sulfur fertilization influences nitrate levels in hops, and how nitrogen and sulfur fertilizer dose jointly affect hop yield, brewing chemistry, and aroma of hops and beer. In an observati…
View article: Didymella tanaceti 2004-2014 population SSR, SDHI and MAT data
Didymella tanaceti 2004-2014 population SSR, SDHI and MAT data Open
Didymella tanaceti population collected in 2004-2014 from Tasmania, Australia. Each isolate is an individual. Includes year collected for each isolate Number of Microsatellite repeats are listed for 9 SSR markers. SDHI Substitution i…
View article: Yard Age, Cultivar Susceptibility, and Spring Pruning Practices as Risk Factors for Overwintering of <i>Podosphaera macularis</i> on Hop
Yard Age, Cultivar Susceptibility, and Spring Pruning Practices as Risk Factors for Overwintering of <i>Podosphaera macularis</i> on Hop Open
Hop powdery mildew, caused by Podosphaera macularis, may be initiated by sexual or asexual spores of the pathogen, but only asexual reproduction has been reported in the Pacific Northwest United States. In this region, overwintering is via…
View article: Genetic characterization of downy mildew resistance from the hop (<i>Humulus lupulus</i> L.) line USDA 64035M
Genetic characterization of downy mildew resistance from the hop (<i>Humulus lupulus</i> L.) line USDA 64035M Open
Downy mildew (caused by Pseudoperonospora humuli ) resistance (DMR) will facilitate the success of hop ( Humulus lupulus L.) production in humid, temperate climates. However, DMR in hop has a narrow genetic base, and its genetic architectu…
View article: Registration of seven powdery mildew‐resistant wild hop germplasm lines
Registration of seven powdery mildew‐resistant wild hop germplasm lines Open
Cultivation of common hop ( Humulus lupulus L.) has increased dramatically during the past decade, with the primary growth occurring in the Pacific Northwest of the United States. A major limitation to hop production is hop powdery mildew …
View article: A General Framework for Spatio-Temporal Modeling of Epidemics With Multiple Epicenters: Application to an Aerially Dispersed Plant Pathogen
A General Framework for Spatio-Temporal Modeling of Epidemics With Multiple Epicenters: Application to an Aerially Dispersed Plant Pathogen Open
The spread dynamics of long-distance-dispersed pathogens are influenced by the dispersal characteristics of a pathogen, anisotropy due to multiple factors, and the presence of multiple sources of inoculum. In this research, we developed a …
View article: The hop downy mildew pathogen <i>Pseudoperonospora humuli</i>
The hop downy mildew pathogen <i>Pseudoperonospora humuli</i> Open
Pseudoperonospora humuli is an obligate biotrophic oomycete that causes downy mildew, one of the most devastating diseases of cultivated hop, Humulus lupulus . Downy mildew occurs in all production areas of the crop in the Northern Hemisph…
View article: Registration of high‐yielding aroma hop (<i>Humulus lupulus</i> L.) cultivar ‘USDA Triumph’
Registration of high‐yielding aroma hop (<i>Humulus lupulus</i> L.) cultivar ‘USDA Triumph’ Open
Brewers consistently look for new and unique hop ( Humulus lupulus L.) cultivars that possess excellent flavor profiles and are cost effective to produce and utilize. Proprietary aroma cultivars have in some cases met this need but are cos…
View article: Predicting Damage to Hop Cones by <i>Tetranychus urticae</i> (Acari: Tetranychidae)
Predicting Damage to Hop Cones by <i>Tetranychus urticae</i> (Acari: Tetranychidae) Open
Twospotted spider mite (Tetranychus urticae Koch) is a cosmopolitan pest of numerous plants, including hop (Humulus lupulus L.). The most costly damage from the pest on hop results from infestation of cones, which are the harvested product…
View article: Erratum: Identification of Resistance to Powdery Mildew in Publicly Available Male Hop Germplasm
Erratum: Identification of Resistance to Powdery Mildew in Publicly Available Male Hop Germplasm Open
reported the pedigree of selected male hop germplasm that was resistant to powdery mildew.The original paper indicated that accession 19040M was derived from Fuggle S × Fuggle S, and that 21647M was derived from 64007 × 21337M.This informa…
View article: Transcriptome-Derived Amplicon Sequencing Markers Elucidate the U.S. <i>Podosphaera macularis</i> Population Structure Across Feral and Commercial Plantings of <i>Humulus lupulus</i>
Transcriptome-Derived Amplicon Sequencing Markers Elucidate the U.S. <i>Podosphaera macularis</i> Population Structure Across Feral and Commercial Plantings of <i>Humulus lupulus</i> Open
Obligately biotrophic plant pathogens pose challenges in population genetic studies due to their genomic complexities and elaborate culturing requirements with limited biomass. Hop powdery mildew (Podosphaera macularis) is an obligately bi…
View article: The Effector Repertoire of the Hop Downy Mildew Pathogen Pseudoperonospora humuli
The Effector Repertoire of the Hop Downy Mildew Pathogen Pseudoperonospora humuli Open
Pseudoperonospora humuli is an obligate biotrophic oomycete that causes downy mildew (DM), one of the most destructive diseases of cultivated hop that can lead to 100% crop loss in susceptible cultivars. We used the published genome of P. …