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United States Department of Agriculture

Agricultural Research Service

Research Project: Reducing the Impact of Diseases on Hop Production

Location: Forage Seed and Cereal Research

Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)

Susceptibility of hop cultivars to downy mildew: associations with chemical characteristics and region of origin - (Peer Reviewed Journal)
Woods, J., Gent, D.H. 2016. Susceptibility of hop cultivars to downy mildew: associations with chemical characteristics and region of origin. Plant Health Progress. 17:42-48.
Distribution and characterization of Podosphaera macularis virulent on hop cultivars possessing R6-based resistance to powdery mildew - (Peer Reviewed Journal)
Wolfenbarger, S.N., Massie, S.T., Ocamb, C., Eck, E.B., Grove, G.G., Nelson, M.E., Probst, C., Twomey, M.C., Gent, D.H. 2016. Distribution and characterization of Podosphaera macularis virulent on hop cultivars possessing R6-based resistance to powdery mildew. Plant Disease. http://dx.doi.org/10.1094/PDIS-12-15-1449-RE.
Powdery mildew caused by Podosphaera macularis on hop (Humulus lupulus) in North Carolina - (Peer Reviewed Journal)
Wolfenbarger, S.N., Quesada-Ocampo, L.M., Gent, D.H. 2016. Powdery mildew caused by Podosphaera macularis on hop (Humulus lupulus) in North Carolina. Plant Disease. http://dx.doi.org/10.1094/PDIS-12-15-1525-PDN.
Hop powdery mildew control through alteration of spring pruning practices - (Peer Reviewed Journal)
Probst, C., Nelson, M.E., Grove, G.G., Twomey, M.C., Gent, D.H. 2016. Hop powdery mildew control through alteration of spring pruning practices. Plant Disease. http://dx.doi.org/10.1094/PDIS-10-15-1127-RE.
Interaction of basal foliage removal and late season fungicide applications in management of Hop powdery mildew - (Peer Reviewed Journal)
Gent, D.H., Probst, C., Nelson, M.E., Grove, G.G., Massie, S.T., Twomey, M.C. 2016. Interaction of basal foliage removal and late season fungicide applications in management of Hop powdery mildew. Plant Disease. 100:1153-1160.
Black wilt of hop (Humulus lupulus) caused by Diplodia seriata in New York State - (Peer Reviewed Journal)
Twomey, M.C., Stone, J.K., Gent, D.H. 2016. Black wilt of hop (Humulus lupulus) caused by Diplodia seriata in New York State. Plant Disease. 100(4):861.doi:10.1094/PDSI-10-15-1140-PDN.
Genotyping-by-sequencing of a bi-parental mapping population segregating for downy mildew resistance in hop (Humulus lupulus L.) - (Peer Reviewed Journal)
Henning, J.A., Gent, D.H., Twomey, M.C., Townsend, M.S., Pitra, N.J., Matthews, P.D. 2015. Genotyping-by-sequencing of a bi-parental mapping population segregating for downy mildew resistance in hop (Humulus lupulus L.). Euphytica. doi:10.1007/s10681-015-1600-3.
Simple SNP-based minimal marker genotyping for (Humulus lupulus L.) identification and variety validation - (Peer Reviewed Journal)
Henning, J.A., Coggins, J., Peterson, M. 2015. Simple SNP-based minimal marker genotyping for (Humulus lupulus L.) identification and variety validation. BMC Research Notes. 8(1):1-12. doi:10.1186/s13104-015-1492-2.
Estimation of pyrethrum flower number using digital imagery - (Peer Reviewed Journal)
Scott, J.B., Gent, D.H., Hay, F.S., Pethybridge, S.J. 2015. Estimation of pyrethrum flower number using digital imagery. HortTechnology. 25(5):617-624.
Pseudoperonospora cubensis and P. humuli detection using species-specific probes and high definition melt curve analysis - (Peer Reviewed Journal)
Summers, C.F., Adair, N.L., Gent, D.H., Mcgrath, M.T., Smart, C.D. 2015. Pseudoperonospora cubensis and P. humuli detection using species-specific probes and high definition melt curve analysis. Canadian Journal of Plant Pathology. 37(3):315-330.
Epidemiology and population biology of pseudoperonospora cubensis: a model system for management of downy mildews - (Peer Reviewed Journal)
Ojiambo, P.S., Gent, D.H., Quesada-Ocampo, L.M., Hausbeck, M.K., Holmes, G.J. 2015. Epidemiology and population biology of pseudoperonospora cubensis: a model system for management of downy mildews. Annual Review of Phytopathology. 53:223-246.
Carpogenic germination of sclerotia of Sclerotinia minor and ascosporic infection of pyrethrum flowers - (Peer Reviewed Journal)
O'Malley, T.B., Hay, F.S., Scott, J.B., Gent, D.H., Shivas, R.G., Pethybridge, S.J. 2015. Carpogenic germination of sclerotia of Sclerotinia minor and ascosporic infection of pyrethrum flowers. Canadian Journal of Plant Pathology. 37:179-187.
Risk and maximum residue limits: a study of hops production - (Peer Reviewed Journal)
Zhang, R., Marsh, T., Gent, D.H. 2015. Risk and maximum residue limits: a study of hops production. Journal of Agricultural Science. 7(5):85-93.
A polymerase chain reaction assay for ascosporic inoculum of Sclerotinia species - (Peer Reviewed Journal)
Jones, S.J., Pilkington, S., Gent, D.H., Hay, F.S., Pethybridge, S.J. 2015. A polymerase chain reaction assay for ascosporic inoculum of Sclerotinia species. New Zealand Journal of Crop and Horticultural Science. 43(3):233-240.
Development of partial ontogenic resistance to powdery mildew in Hop cones and its management implications - (Peer Reviewed Journal)
Twomey, M.C., Wolfenbarger, S.N., Woods, J.L., Gent, D.H. 2015. Development of partial ontogenic resistance to powdery mildew in Hop cones and its management implications. PLoS One. 10(3):e0120987.
Changes in distribution and frequency of fungi associated with a foliar disease complex of pyrethrum in Australia - (Peer Reviewed Journal)
Hay, F., Gent, D.H., Pilkington, S., Pearce, T., Scott, J.B., Pethybridge, S.J. 2015. Changes in distribution and frequency of fungi associated with a foliar disease complex of pyrethrum in Australia. Plant Disease. 99:1227-1235.
Precision QTL mapping of downy mildew resistance in Hop (Humulus lupulus L.) - (Peer Reviewed Journal)
Henning, J.A., Gent, D.H., Twomey, M., Townsend, M.S., Pitra, N., Matthews, P. 2015. Precision QTL mapping of downy mildew resistance in Hop (Humulus lupulus L.). Euphytica. 202(3):487-498.
Pre- and post-infection activity of fungicides in control of hop downy mildew - (Peer Reviewed Journal)
Gent, D.H., Twomey, M.C., Wolfenbarger, S.N., Woods, J.L. 2015. Pre- and post-infection activity of fungicides in control of hop downy mildew. Plant Disease. 99:858-865.
Identification and distribution of the mating-type idiomorphs in populations of Podosphaera macularis and development of chasmothecia of the fungus - (Peer Reviewed Journal)
Wolfenbarger, S.N., Twomey, M.C., Gadoury, D., Knaus, B.J., Grunwald, N.J., Gent, D.H. 2015. Identification and distribution of the mating-type idiomorphs in populations of Podosphaera macularis and development of chasmothecia of the fungus. Plant Pathology. 64:1094-1102.
Thrips tabaci (Thysanoptera: Thripidae) and Iris yellow spot virus associated with onion transplants, onion volunteers, and weeds in Colorado - (Peer Reviewed Journal)
Schwartz, H.F., Gent, D.H., Fichtner, S.M., Otto, K., Boateng, C., Szostek, S., Cranshaw, W., Mahaffey, L. 2014. Thrips tabaci (Thysanoptera: Thripidae) and Iris yellow spot virus associated with onion transplants, onion volunteers, and weeds in Colorado. Southwestern Entomologist. 39(4):691-704.
Meta-analysis reveals a critical period for management of powdery mildew on Hop cones - (Peer Reviewed Journal)
Nelson, M.E., Gent, D.H., Grove, G.G. 2015. Meta-analysis reveals a critical period for management of powdery mildew on Hop cones. Plant Disease. 99:632-640.
Concepts of sustainability, motivations for pest management approaches, and implications for communicating change - (Peer Reviewed Journal)
Sherman, J., Gent, D.H. 2014. Concepts of sustainability, motivations for pest management approaches, and implications for communicating change. Plant Disease. 98(8):1024-1035.
Red crown rot of Hop in Oregon caused by Phomopsis tuberivora - (Peer Reviewed Journal)
Gent, D.H., Mueller Warrant, G.W., Woods, J.L., Putnam, M., Twomey, M. 2014. Red crown rot of Hop in Oregon caused by Phomopsis tuberivora. Plant Health Progress. doi: 10.1094/PHP-2014-0624-01-BR.
Development of biological control of Tetranychus urticae (Acari:Tetranychidae) and Phorodon humuli (Hemiptera: Aphididae) in Oregon Hop yards - (Peer Reviewed Journal)
Woods, J.L., Dreves, A.J., James, D.G., Lee, J.C., Walsh, D.B., Gent, D.H. 2014. Development of biological control of Tetranychus urticae (Acari:Tetranychidae) and Phorodon humuli (Hemiptera: Aphididae) in Oregon Hop yards. Journal of Economic Entomology. 107(2):570-581.
Characterization of resistance to powdery mildew in the Hop cultivars Newport and Comet - (Peer Reviewed Journal)
Wolfenbarger, S.N., Eck, E.B., Gent, D.H. 2014. Characterization of resistance to powdery mildew in the Hop cultivars Newport and Comet. Plant Health Progress. DOI:10.1094/PHP-BR-13-0129.
Suppression of Hop Looper (Lepidoptera: Noctuidae) by the fungicide Pyraclostrobin - (Peer Reviewed Journal)
Woods, J.L., Gent, D.H. 2014. Suppression of Hop Looper (Lepidoptera: Noctuidae) by the fungicide Pyraclostrobin. Journal of Economic Entomology. 107(2):875-879.
Powdery mildew outbreaks caused by Podosphaera macularis on Hop cultivars possessing the resistance gene R6 in the Pacific Northwestern United States - (Peer Reviewed Journal)
Wolfenbarger, S.N., Eck, E.B., Ocamb, C.M., Probst, C., Nelson, M.E., Grove, G.G., Gent, D.H. 2014. Powdery mildew outbreaks caused by Podosphaera macularis on Hop cultivars possessing the resistance gene R6 in the Pacific Northwestern United States. Plant Disease. 98(6):852-853.
Minimizing crop damage through understanding relationships between pyrethrum phenology and ray blight disease severity - (Peer Reviewed Journal)
Pethybridge, S.J., Gent, D.H., Groom, T., Hay, F. 2013. Minimizing crop damage through understanding relationships between pyrethrum phenology and ray blight disease severity. Plant Disease. 97(11):1431-1437.
Crop damage caused by Powdery Mildew on Hop and its relationship to late season management - (Peer Reviewed Journal)
Gent, D.H., Grove, G.G., Nelson, M.E., Wolfenbarger, S.N., Farnsworth, J.L. 2014. Crop damage caused by Powdery Mildew on Hop and its relationship to late season management. Plant Pathology. 63:625-639.
Quantifying the effects of uniconazole on growth and yield of pyrethrum in Australia - (Peer Reviewed Journal)
Pethybridge, S.J., Gent, D.H., Hingston, L., Frost, P. 2014. Quantifying the effects of uniconazole on growth and yield of pyrethrum in Australia. New Zealand Journal of Crop and Horticultural Science. 42(1):50-59.
Spatiotemporal characterization of Sclerotinia crown rot epidemics in pyrethrum - (Peer Reviewed Journal)
Scott, J.B., Gent, D.H., Pethybridge, S.J., Hay, F.S. 2014. Spatiotemporal characterization of Sclerotinia crown rot epidemics in pyrethrum. Plant Disease. (98):267-274.
Crop damage from Sclerotinia crown rot and risk factors in pyrethrum - (Peer Reviewed Journal)
Scott, J.B., Gent, D.H., Pethybridge, S.J., Groom, T., Hay, F. 2014. Crop damage from Sclerotinia crown rot and risk factors in pyrethrum. Plant Disease. 98:103-111.
Last Modified: 8/28/2016
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