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 Horticultural Crops Disease and Pest Management Research Unit: Corvallis, OR
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ARS Home Pacific West Area Corvallis, Oregon Horticultural Crops Disease and Pest Management Research Unit People





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Gerald  Weiland

(Jerry)    Research Plant Pathologist /ARSUserFiles/42123/Weiland Photos/Jerry.jpg 3420 NW Orchard AveCorvallis, OR 97330(541) 738-4062 Our research is focused on plant pathogens affecting trees, shrubs, and vines of the small fruit and nursery industries. Our overall goal is to better understand the pathogen communities that infect horticultural crops so that we can develop more effective disease control strategies. Use the following links to learn more! Nursery Industry
Small Fruit Industry
Other Industries Served
 ProjectsMinor Use Pesticide Testing on Floral and Nursery CropsIn-House Appropriated (D)Accession Number:438086Disease Management in Small Fruit and Nursery Crops Based on Knowledge of Pathogen Diversity, Biology, and Environmental EffectsIn-House Appropriated (D)Accession Number:441106Improving Boxwood Blight Mitigation through Innovation, Economic Analysis and EducationReimbursable Cooperative Agreement (R)Accession Number:438735Improving Nursery Plant Health for Nurseries in the Pacific NorthwestNon-Assistance Cooperative Agreement (S)Accession Number:439047Fungicide Resistance, Hormesis, and Fungal Pathogens in Controlled Environment CropsNon-Assistance Cooperative Agreement (S)Accession Number:439065Plant-Parasitic Nematodes of the Pacific Northwest Nursery IndustryNon-Assistance Cooperative Agreement (S)Accession Number:442511Detection of Phytophthora Infections in West Coast NurseriesNon-Assistance Cooperative Agreement (S)Accession Number:443229Boxwood Blight Presence and Management in Oregon NurseriesNon-Assistance Cooperative Agreement (S)Accession Number:437194  Publications(Clicking on the reprint iconReprint Icon  will take you to the publication reprint.)Greater rate of nitrogen fertilizer application increases root rot caused by Phytophthora cinnamomi and P. plurivora in container-grown rhododendron-(Peer Reviewed Journal) Mestas, A., Weiland, G.E., Scagel, C.F., Davis, E.A., Mitchell, J.N., Beck, B.R. 2023. Greater rate of nitrogen fertilizer application increases root rot caused by Phytophthora cinnamomi and P. plurivora in container-grown rhododendron. Plant Pathology. https://doi.org/10.1111/ppa.13776.Temperature and fungicide sensitivity in three prevalent Phytophthora species causing Phytophthora root rot in rhododendron-(Peer Reviewed Journal) Scagel, C.F., Weiland, G.E., Beck, B.R., Mitchell, J.N. 2023. Temperature and fungicide sensitivity in three prevalent Phytophthora species causing Phytophthora root rot in rhododendron. Plant Disease. https://doi.org/10.1094/pdis-11-22-2670-re.The effect of water incubation and host volatiles on spore germination of Calonectria pseudonaviculata, the causal agent of boxwood blight-(Abstract Only)Boxwood (Buxus spp.) - Boxwood Blight-(Other) Pscheidt, J.W., Ohkura, M., Weiland, G.E. 2023. Boxwood (Buxus spp.) - Boxwood Blight. Pacific Northwest Plant Disease Management Handbook. [online].Corvallis, OR: Oregon State University.Rapid and scalable DNA extraction and real-time PCR assay from boxwood tissue for the detection of Calonectria pseudonaviculata, causal agent of boxwood blight-(Peer Reviewed Journal) Ohkura, M., Scagel, C.F., Weiland, G.E. 2023. Rapid and scalable DNA extraction and real-time PCR assay from boxwood tissue for the detection of Calonectria pseudonaviculata, causal agent of boxwood blight. Plant Disease. 107(5):1279-1283. https://doi.org/10.1094/PDIS-06-22-1453-SR.Cool temperatures favor growth of Oregon isolates of Calonectria pseudonaviculata and increase severity of boxwood blight on two Buxus cultivars-(Peer Reviewed Journal) Weiland, G.E., Ohkura, M., Scagel, C.F., Davis, E.A., Beck, B.R. 2022. Cool temperatures favor growth of Oregon isolates of Calonectria pseudonaviculata and increase severity of boxwood blight on two Buxus cultivars. Plant Disease. https://doi.org/10.1094/PDIS-04-22-0769-RE.Irrigation frequency and volume has little influence on Phytophthora root rot in container-grown rhododendron-(Peer Reviewed Journal) Weiland, G.E., Scagel, C.F., Grunwald, N.J., Davis, E.A., Beck, B.R., Mitchell, J.N. 2022. Irrigation frequency and volume has little influence on Phytophthora root rot in container-grown rhododendron. Journal of Environmental Horticulture. 40(2):67-78. https://doi.org/10.24266/2573-5586-40.2.67.First report of Macrophomina phaseolina causing charcoal root rot of Hebe (Veronica cupressoides, V. ochracea, and V. pinguifolia) in Oregon, U.S.A.-(Peer Reviewed Journal) Weiland, G.E. 2022. First report of Macrophomina phaseolina causing charcoal root rot of Hebe (Veronica cupressoides, V. ochracea, and V. pinguifolia) in Oregon, U.S.A. Plant Disease. 106(7):1984. https://doi.org/10.1094/PDIS-09-21-2036-PDN.Is disease induced by flooding representative of nursery conditions in rhododendrons infected with P. cinnamomi or P. plurivora?-(Peer Reviewed Journal) Mestas, A., Weiland, G.E., Scagel, C.F., Grunwald, N.J., Davis, E.A., Mitchell, J.N., Beck, B.R. 2022. Is disease induced by flooding representative of nursery conditions in rhododendrons infected with P. cinnamomi or P. plurivora? Plant Disease. 106(4):1157-1166. https://doi.org/10.1094/PDIS-06-21-1340-RE.Call it herbal distancing©-(Trade Journal) Ohkura, M., Nackley, L., Scagel, C.F., Weiland, G.E. 2021. Call it herbal distancing©. Digger. https://www.diggermagazine.com/wp-content/uploads/2021/08/.Phylogeography of the wide-host range panglobal plant pathogen phytophthora cinnamomi-(Peer Reviewed Journal) Shakya, S.K., Grunwald, N.J., Fieland, V.J., Knaus, B.J., Weiland, G.E., Maia, C., Drenth, A., Guest, D.I., Liew, E.C., Crane, C., Chang, T., Fu, C., Chi, N., Thu, P., Scanu, B., Jung, M.H., Jung, T. 2021. Phylogeography of the wide-host range panglobal plant pathogen phytophthora cinnamomi. Molecular Ecology. 30(20):5164-5178. https://doi.org/10.1111/mec.16109.A diagnostic guide of Volutella blight affecting Buxaceae-(Peer Reviewed Journal) Yang, X., Chastrogudin, V.L., Daughtrey, M.L., Loyd, A., Weiland, G.E., Shishkoff, N., Baysal-Gurel, F., Santamaria, L., Salgado-Salazar, C., Lamondia, J., Crouch, J., Luster, D.G. 2021. A diagnostic guide of Volutella blight affecting Buxaceae. Plant Health Progress. 22:578-590. https://doi.org/10.1094/PHP-02-21-0052-DG.The challenges of managing phytophthora root rot in the nursery industry-(Review Article) Weiland, G.E. 2021. The challenges of managing phytophthora root rot in the nursery industry. Plant Health Progress. 22:332-341. https://doi.org/10.1094/PHP-02-21-0036-FI.Optimizing inoculum production methods for infesting soil with phytophthora species-(Peer Reviewed Journal) Davis, E.A., Weiland, G.E., Scagel, C.F. 2021. Optimizing inoculum production methods for infesting soil with phytophthora species. Plant Disease. https://doi.org/10.1094/PDIS-12-20-2698-RE.Virulence of five phytophthora species causing rhododendron root rot in Oregon-(Peer Reviewed Journal) Sacher, G.O., Scagel, C.F., Davis, E.A., Beck, B.R., Weiland, G.E. 2021. Virulence of five phytophthora species causing rhododendron root rot in Oregon. Plant Disease. https://doi.org/10.1094/PDIS-09-20-1873-RE.Phytophthora species differ in response to phosphorous acid and mefenoxam for the management of phytophthora root rot in rhododendron-(Peer Reviewed Journal) Weiland, G.E., Scagel, C.F., Grunwald, N.J., Davis, E.A., Beck, B.R. 2020. Phytophthora species differ in response to phosphorous acid and mefenoxam for the management of phytophthora root rot in rhododendron. Plant Disease. 105:1505-1514. https://doi.org/10.1094/PDIS-09-20-1960-RE.Growth, sporulation, and pathogenicity of the raspberry pathogen phytophthora rubi under different temperature and moisture regimes-(Peer Reviewed Journal) Graham, K.A., Beck, B.R., Zasada, I.A., Scagel, C.F., Weiland, G.E. 2021. Growth, sporulation, and pathogenicity of the raspberry pathogen phytophthora rubi under different temperature and moisture regimes. Plant Disease. https://doi.org/10.1094/PDIS-09-20-1916-RE.Boxwood blight disease: a diagnostic guide-(Peer Reviewed Journal) Castroagudin, V.L., Yang, X., Daughtrey, M.L., Luster, D.G., Pscheidt, J.W., Weiland, G.E., Crouch, J.A. 2020. Boxwood blight disease: A diagnostic guide. Plant Health Progress. 21:291-300. https://doi.org/10.1094/PHP-06-20-0053-DG.One clonal lineage of Calonectria pseudonaviculata is primarily responsible for the boxwood blight epidemic in the United States-(Peer Reviewed Journal) Castroagudín, V., Weiland, J.E., Baysal-Gurel, F., Cubeta, M., Daughtrey, M., Gauthier, N., Lamondia, J., Luster, D.G., Hand, F., Shishkoff, N., Williams-Woodward, J., LeBlanc, N., Yang, X., Crouch, J.A. 2020. One clonal lineage of Calonectria pseudonaviculata is primarily responsible for the boxwood blight epidemic in the United States. Phytopathology. 110(11):1845-1853. https://doi.org/10.1094/PHYTO-04-20-0130-R.Confirmation of Calonectria pseudonaviculata causing boxwood blight of Buxus sempervirens and Buxus cultivars in Oregon-(Peer Reviewed Journal) Sacher, G.O., Weiland, G.E., Putnam, M.L., Crouch, J., Castroaguddin, V.L. 2020. Confirmation of Calonectria pseudonaviculata causing boxwood blight of Buxus sempervirens and Buxus cultivars in Oregon. Plant Disease. 104(6):1862. https://doi.org/10.1094/PDIS-01-20-0078-PDN.Pathogenicity of four phytophthora species causing rhododendron root rot in Oregon-(Abstract Only)Soilborne Phytophthora and Pythium diversity from rhododendron in propagation, container, and field production systems of the Pacific Northwest-(Peer Reviewed Journal) Weiland, G.E., Scagel, C.F., Grunwald, N.J., Davis, E.A., Beck, B.R., Foster, Z.S., Fieland, V.J. 2020. Soilborne Phytophthora and Pythium diversity from rhododendron in propagation, container, and field production systems of the Pacific Northwest. Plant Disease. 104(6):1841-1850. https://doi.org/10.1094/PDIS-08-19-1672-RE.The composition of the fungal and oomycete microbiome of Rhododendron roots under varying growth conditions, nurseries, and cultivars-(Peer Reviewed Journal) Foster, Z.S., Weiland, G.E., Scagel, C.F., Grunwald, N.J. 2020. The composition of the fungal and oomycete microbiome of Rhododendron roots under varying growth conditions, nurseries, and cultivars. Phytobiomes Journal. 4(2):156-164. https://doi.org/10.1094/PBIOMES-09-19-0052-R.Scouting for boxwood blight: Insights from the 2019 survey-(Trade Journal) Weiland, G.E., Pscheidt, J.W. 2020. Scouting for boxwood blight: Insights from the 2019 survey. Digger. March 2020:25-28. Available: http://www.diggermagazine.com/wp-content/uploads/2020/02/Digger_202003.pdfDirected energy system technology for the control of soil borne fungal pathogens and plant-parasitic nematodes-(Peer Reviewed Journal) Riga, E., Crisp, J.D., McComb, G.J., Zasada, I.A., Weiland, G.E. 2020. Directed energy system technology for the control of soil borne fungal pathogens and plant-parasitic nematodes. Pest Management Science. 76(6):2072-2078. https://doi.org/10.1002/ps.5745.Amending sandy soil with biochar promotes plant growth and root colonization by mycorrhizal fungi in highbush blueberry-(Peer Reviewed Journal) Sales, B.K., Bryla, D.R., Trippe, K.M., Weiland, G.E., Scagel, C.F., Strik, B.C., Sullivan, D.M. 2020. Amending sandy soil with a softwood biochar promotes plant growth and root colonization by mycorrhizal fungi in highbush blueberry. HortScience. 55(3):353-361. https://doi.org/10.21273/HORTSCI14542-19.Boxwood (Buxus spp.)-Box Blight-(Other) Pscheidt, J.W., Weiland, G.E. 2020. Boxwood (Buxus spp.)-Box Blight. Pacific North West Plant Disease Management Handbook. p. 4B-56 to 4B-58.Population structure of Phytophthora plurivora on Rhododendron in Oregon nurseries-(Peer Reviewed Journal) Carleson, N.C., Fieland, V.J., Scagel, C.F., Weiland, G.E., Grunwald, N.J. 2019. Population structure of Phytophthora plurivora on Rhododendron in Oregon nurseries. Plant Disease. 103(8):1923-1930. https://doi.org/10.1094/PDIS-12-18-2187-RE.Raspberry disease and nematode management-(Book / Chapter)Rhododendron-Phytophthora root rot-(Other) Pscheidt, J.W., Ocamb, C., Weiland, G.E., Scagel, C.F., Sacher, G., Mestas, A. 2019. Rhododendron-Phytophthora root rot. Pages 4R-28 to 4R-30 in Pacific Northwest Plant Disease Control Handbook. Oregon State University, Corvallis, OR. https://pnwhandbooks.org/node/3437.Disease control of Phytophthora plurivora and other Phytophthora species infecting European beech and rhododendron in the United States-(Abstract Only) Weiland, G.E., Grunwald, N.J., Scagel, C.F. 2018. Disease control of Phytophthora plurivora and other Phytophthora species infecting European beech and rhododendron in the United States. Meeting Abstract for LIFE+ ELMIAS Ash and Elm, and IUFRO WP 7.02.01 Root and Stem Rots Conference (LIFE-IUFRO); 2018. Aug 26-Sept 1; Uppsala and Visby, Sweden.Variation in disease severity caused by Phytophthora cinnamomi, P. plurivora, and Pythium cryptoirregulare on two rhododendron cultivars-(Peer Reviewed Journal) Weiland, G.E., Scagel, C.F., Grunwald, N.J., Davis, E.A., Beck, B.R. 2018. Variation in disease severity caused by Phytophthora cinnamomi, P. plurivora, and Pythium cryptoirregulare on two rhododendron cultivars. Plant Disease. https://doi.org/10.1094/PDIS-04-18-0666-RE.Effects of amending soil with biochar on plant growth, mycorrhizal colonization, and phytophthora root rot in northern highbush blueberry-(Abstract Only) Sales, B.K., Bryla, D.R., Trippe, K.M., Weiland, G.E., Scagel, C.F. 2019. Effects of amending soil with biochar on plant growth, mycorrhizal colonization, and phytophthora root rot in northern highbush blueberry. HortScience. 53(9):S51.Effectiveness of nontarped broadcast fumigation and root removal on root lesion nematode and Fusarium and Pythium species in a red raspberry system-(Peer Reviewed Journal) Devetter, L., Watkinson, S., Zasada, I.A., Weiland, G.E., Hesse, C.N., Walters, T.W. 2018. Effectiveness of nontarped broadcast fumigation and root removal on root lesion nematode and Fusarium and Pythium species in a red raspberry system. Plant Health Progress. 19(2):168-175. https://doi.org/10.1094/PHP-01-18-0006-RS.A rapid, sensitive and field-deployable isothermal assay for the detection of Verticillium alfalfae-(Peer Reviewed Journal) Reyes Gaige, A., Dung, J.K., Weiland, G.E. 2018. A rapid, sensitive and field-deployable isothermal assay for the detection of Verticillium alfalfae. Canadian Journal of Plant Pathology. https://doi.org/10.1080/07060661.2018.1474262.Heroes and villains: Research identifies harmful and beneficial microbes in nursery soil-(Trade Journal) Weiland, G.E., Scagel, C.F., Grunwald, N.J., Foster, Z., Fieland, V., Santamaria, L. 2018. Heroes and villains: Research identifies harmful and beneficial microbes in nursery soil. Digger. March:25-29.Comparing methods for inducing root rot of Rhododendron with Phytophthora cinnamomi and P. plurivora-(Abstract Only) Mestas, A., Weiland, G.E., Beck, B.R., Davis, E.A., Grunwald, N.J., Scagel, C.F. 2017. Comparing methods for inducing root rot of Rhododendron with Phytophthora cinnamomi and P. plurivora [abstract]. Phytopathology. 107:S5.189. https://doi.org/10.1094/PHYTO-107-12-S5.180.Efficacy of management tools for control of Phytophthora plurivora leaf spot of Rhododendron, 2014-(Peer Reviewed Journal) Press, C.M., Rolfe, K.J., Weiland, G.E., Grunwald, N.J. 2017. Efficacy of management tools for control of Phytophthora plurivora leaf spot of Rhododendron, 2014. Plant Disease Management Reports. 11:OT035.Late summer disease symptoms in western Washington red raspberry fields associated with co-occurrence of Phytophthora rubi, Verticillium dahliae, and Pratylenchus penetrans, but not Raspberry bushy dwarf virus-(Peer Reviewed Journal) Weiland, G.E., Benedict, C., Zasada, I.A., Scagel, C.F., Beck, B.R., Davis, E.A., Graham, K., Peetz, A.B., Martin, R.R., Dung, J.K., Reyes Gaige, A., Thiessen, L.S. 2017. Late summer disease symptoms in western Washington red raspberry fields associated with co-occurrence of Phytophthora rubi, Verticillium dahliae, and Pratylenchus penetrans, but not Raspberry bushy dwarf virus. Plant Disease. 102(5):938-947. https://doi.org/10.1094/PDIS-08-17-1293-RE.Fungicides reduce Rhododendron root rot and mortality caused by Phytophthora cinnamomi, but not by P. plurivora-(Abstract Only) Weiland, G.E., Scagel, C.F., Grunwald, N.J., Davis, E.A., Mitchell, J.N., Beck, B.R. 2017. Fungicides reduce Rhododendron root rot and mortality caused by Phytophthora cinnamomi, but not by P. plurivora. Abstract for American Society for Horticultural Science Annual Conference; Sept 19-22; Waikoloa, HI.Irrigation affects severity of root rot caused by Phythophthora plurivora and P. cinnamomi on rhododendron-(Abstract Only) Scagel, C.F., Weiland, G.E., Grunwald, N.J., Davis, E.A., Beck, B.R., Mitchell, J.N. 2017. Irrigation affects severity of root rot caused by Phythophthora plurivora and P. cinnamomi on rhododendron. Abstract for American Society for Horticultural Science Annual Conference; Sept 19-22; Waikoloa, HI.Expanding the scope of a single pathogen survey to solve the mystery of the ailing red raspberries-(Abstract Only) Weiland, G.E., Benedict, C., Zasada, I.A., Beck, B.R., Davis, E.A., Graham, K., Peetz, A.B., Martin, R.R., Dung, J., Reyes Gaige, A., Thiessen, L. 2017. Expanding the scope of a single pathogen survey to solve the mystery of the ailing red raspberries [abstract]. Phytopathology. 107:S5.4. https://doi.org/10.1094/PHYTO-107-12-S5.1.The effects of cultivar, production system, and nursery on the composition of the rhizosphere microbiome of cultivated rhododendrons in Oregon-(Abstract Only) Foster, Z.S., Weiland, G.E., Scagel, C.F., Grunwald, N.J. 2017. The effects of cultivar, production system, and nursery on the composition of the rhizosphere microbiome of cultivated rhododendrons in Oregon [abstract]. Phytopathology. 107:S5.4. https://doi.org/10.1094/PHYTO-107-12-S5.1.Nonchemical, cultural management strategies to suppress phytophthora root rot in northern highbush blueberry-(Peer Reviewed Journal) Yeo, J.R., Weiland, G.E., Sullivan, D.M., Bryla, D.R. 2017. Nonchemical, cultural management strategies to suppress phytophthora root rot in northern highbush blueberry. HortScience. 52(5):725-731. doi: 10.21273/HORTSCI11437-16.Pathology smorgasboard: Biocontrol, pathogen movement, and recent fumigation results-(Government Publication) Weiland, G.E. 2017. Pathology smorgasboard: Biocontrol, pathogen movement, and recent fumigation results. Tree Planters' Notes. 60(2):81-87.Screening Phytophthora rubi for fungicide resistance-(Proceedings) Weiland, G.E. 2017. Screening Phytophthora rubi for fungicide resistance. Washington Small Fruit Conference. Whatcom Ag Monthly. 5(12).Verticillium survey results: Is it in red raspberry production fields?-(Proceedings) Weiland, G.E. 2017. Verticillium survey results: Is it in red raspberry production fields?. Washington Small Fruit Conference. Whatcom Ag Monthly. 5(12).Distribution and longevity of Pratylenchus penetrans in the red raspberry production system-(Peer Reviewed Journal) Kroese, D.R., Weiland, G.E., Zasada, I.A. 2016. Distribution and longevity of Pratylenchus penetrans in the red raspberry production system. Journal of Nematology. 48(4):241–247.First report of Phaeobotryon cupressi causing canker of Calocedrus decurrens (incense-cedar) in Oregon-(Peer Reviewed Journal) Weiland, G.E., Sniezko, R., Wiseman, M., Serdani, M., Putnam, M. 2016. First report of Phaeobotryon cupressi causing canker of Calocedrus decurrens (incense-cedar) in Oregon. Plant Disease. 100(8):1793. https://doi.org/10.1094/PDIS-03-16-0313-PDN.New canker disease of Incense-cedar in Oregon caused by Phaeobotryon cupressi.-(Abstract Only)Fighting phytophthora in blueberries-(Trade Journal) Yeo, J., Sullivan, D., Bryla, D.R., Weiland, G.E. 2016. Fighting phytophthora in blueberries. American Fruit Grower. April 2016. http://www.growingproduce.com/fruits/berries/fighting-phytophthora-in-blueberries/.Efficacy of reduced rate fumigant alternatives and methyl bromide against soilborne pathogens and weeds in western forest nurseries-(Peer Reviewed Journal) Weiland, G.E., Littke, W.R., Browning, J.E., Edmonds, R.L., Davis, E.A., Beck, B.R., Miller, T.W. 2016. Efficacy of reduced rate fumigant alternatives and methyl bromide against soilborne pathogens and weeds in western forest nurseries. Crop Protection. 85:57-64. https://doi.org/10.1016/j.cropro.2016.03.016.Susceptibility of highbush blueberry cultivars to Phytophthora root rot-(Peer Reviewed Journal) Yeo, J.R., Weiland, G.E., Sullivan, D., Bryla, D.R. 2016. Susceptibility of highbush blueberry cultivars to Phytophthora root rot. HortScience. 51(1):74-78.Comparative RNA-seq for the investigation of tolerance to Verticillium wilt in black raspberry-(Peer Reviewed Journal) Bushakra, J., Bassil, N.V., Weiland, G.E., Finn, C.E., Vining, K., Filichkin, S., Dossett, M., Bryant, D., Mockler, T. 2016. Comparative RNA-seq for the investigation of tolerance to Verticillium wilt in black raspberry. Acta Horticulture Proceedings. 1133:103-114. doi: 10.17660/ActaHortic.2016.1133.16.Soilborne Diseases of the Nursery Industry: USDA-ARS and OSU Team Up to Tackle this Pernicious Problem-(Trade Journal) Weiland, G.E., Scagel, C.F., Grunwald, N.J., Foster, Z., Santamaria, L. 2015. Soilborne Diseases of the Nursery Industry: USDA-ARS and OSU Team Up to Tackle this Pernicious Problem. Digger. 59(7):33-36.Irrigation and fertigation with drip and alternative micro irrigation systems in northern highbush blueberry-(Peer Reviewed Journal) Vargas, O., Bryla, D.R., Weiland, G.E., Strik, B.C., Sun, L. 2015. Irrigation and fertigation with drip and alternative micro irrigation systems in northern highbush blueberry. HortScience. 50(6):897-903.Root removal to improve disease management in replanted Washington red raspberry fields-(Abstract Only) Weiland, G.E., Zasada, I.A., Devetter, L.W., Walters, T., Rudolph, R., Watkinson, S. 2015. Root removal to improve disease management in replanted Washington red raspberry fields. American Phytopathological Society Annual Meeting, August 1-5, 2015, Pasadena, California.Developing black raspberry genetic and genomic resources-(Abstract Only) Bushakra, J., Bryant, D., Dossett, M., Vining, K., Vanburen, R., Gilmore, B.S., Filichkin, S., Weiland, G.E., Peterson, M.E., Bradish, C.M., Fernandez, G., Lewers, K.S., Graham, J., Lee, J., Mockler, T., Bassil, N.V., Finn, C.E. 2015. Developing black raspberry genetic and genomic resources [abstract]. International Rubus and Ribes Symposium.Toward understanding genotype x environment interactions in black raspberry (Rubus occidentalis L.)-(Peer Reviewed Journal) Bushakra, J., Bradish, C., Weber, C.A., Dossett, M., Fernandez, G., Weiland, G.E., Peterson, M.E., Scheerens, J.C., Robbins, L., Serce, S., Finn, C.E., Bassil, N.V. 2016. Toward understanding genotype x environment interactions in black raspberry (Rubus occidentalis L.). Acta Horticulturae. 1117:25-30. doi: 10.17660/ActaHortic.2016.1117.5.Greenhouse plants, ornamental – Pythium seed rot, damping-off, and root rot-(Review Article) Weiland, G.E., Santamaria, L. 2015. Greenhouse plants, ornamental – Pythium seed rot, damping-off, and root rot. Pacific Northwest Plant Disease Control Handbook. p. 4G-47-4G-48.Efficacy of management tools for control of Pythium root rot of Douglas-fir seedlings, 2013-(Peer Reviewed Journal) Grunwald, N.J., Press, C.M., Rolfe, K.J., Weiland, G.E., Davis, E.A. 2015. Efficacy of management tools for control of Pythium root rot of Douglas-fir seedlings, 2013. Plant Disease Management Reports. 9:OT004.Population structure of Pythium irregulare, P. sylvaticum, and P. ultimum in forest nursery soils of Oregon and Washington-(Peer Reviewed Journal) Weiland, G.E., Garrido, P., Kamvar, Z.N., Marek, S.M., Grunwald, N.J., Garzon, C.D. 2015. Population structure of Pythium irregulare, P. sylvaticum, and P. ultimum in forest nursery soils of Oregon and Washington. Phytopathology. 105(5):684-694.Impact of Pratylenchus penetrans on establishment of red raspberry-(Peer Reviewed Journal) Zasada, I.A., Weiland, G.E., Han, Z., Walters, T.W., Moore, P.P. 2015. Impact of Pratylenchus penetrans on establishment of red raspberry. Plant Disease. 99(7):939-946.First report of Phytophthora cactorum and P. citrophthora causing root rot of Ribes lobbii (Gray) in Oregon-(Peer Reviewed Journal) Weiland, G.E. 2015. First report of Phytophthora cactorum and P. citrophthora causing root rot of Ribes lobbii (Gray) in Oregon. Plant Disease. 99(1):157.Variation in response among Pythium species and isolates to Streptomyces lydicus-(Abstract Only) Weiland, G.E. 2014. Variation in response among Pythium species and isolates to Streptomyces lydicus. APS Annual Meeting. August 9-13, 2014, Minneapolis, Minnesota.Building the genomic infrastructure in black raspberry-(Abstract Only) Bryant, D., Bushakra, J., Dossett, M., Vining, K., Filichkin, S., Weiland, G.E., Lee, J., Finn, C.E., Bassil, N.V., Mockler, T. 2014. Building the genomic infrastructure in black raspberry [abstract]. American Society for Horticultural Science Annual Conference.Identifying rates of meadowfoam (Limnanthes alba) seed meal needed for suppression of Meloidogyne hapla and Pythium irregulare in soil-(Peer Reviewed Journal) Ersahin, Y.S., Weiland, G.E., Zasada, I.A., Reed, R.L., Stevens, J.F. 2014. Identifying rates of meadowfoam (Limnanthes alba) seed meal needed for suppression of Meloidogyne hapla and Pythium irregulare in soil. Plant Disease. 98(9):1253-1260.Black raspberry genetic and genomic resources development-(Abstract Only) Bushakra, J., Bryant, D., Dossett, M., Gilmore, B.S., Filichkin, S., Weiland, G.E., Peterson, M.E., Bradish, C.M., Fernandez, G., Lewers, K.S., Graham, J., Lee, J., Mockler, T., Bassil, N.V., Finn, C.E. 2014. Black raspberry genetic and genomic resources development [abstract]. Annual Scientific Meeting of the American Society of Plant Biologists.Sensitivity of Pythium irregulare, P. sylvaticum, and P. ultimum from forest nurseries to mefenoxam and fosetyl-al, and control of Pythium damping-off-(Peer Reviewed Journal) Weiland, G.E., Santamaria, L., Grunwald, N.J. 2014. Sensitivity of Pythium irregulare, P. sylvaticum, and P. ultimum from forest nurseries to mefenoxam and fosetyl-al, and control of Pythium damping-off. Plant Disease. 98:937-942.Understanding the pathology of Douglas-fir seedlings in Pacific Northwest nurseries-(Proceedings) Weiland, G.E. 2015. Understanding the pathology of Douglas-fir seedlings in Pacific Northwest nurseries. In: Rocky Mountain Research Station Proceedings 72. Annual Meeting of Western Forest and Conservation Nursery Association, August 6-7, 2013, Olympia, Washington. p. 38-40.Methyl bromide phase out could affect future reforestation efforts-(Trade Journal) Weiland, G.E. 2014. Methyl bromide phase out could affect future reforestation efforts. Western Forester. 59:8-10.Pythium species and isolate diversity influence inhibition by the biological control agent Streptomyces lydicus-(Peer Reviewed Journal) Weiland, G.E. 2014. Pythium species and isolate diversity influence inhibition by the biological control agent Streptomyces lydicus. Plant Disease. 98(5):653-659.Verticillium wilt in the Pacific Northwest-(Review Article) Dung, J., Weiland, G.E., Pscheidt, J.W. 2014. Verticillium wilt in the Pacific Northwest. Pacific Northwest Plant Disease Control Handbook. p. 3-22 to 3-28.Exploring the characteristics of Pythium communities: Can knowledge about pathogen communities improve disease control?-(Abstract Only) Weiland, G.E., Garrido, P., Grunwald, N.J., Garzon, C. 2013. Exploring the characteristics of Pythium communities: Can knowledge about pathogen communities improve disease control?. In: Phytopathology. Annual Meeting of the American Phytopathological Society, August 10-14, 2013, Austin, Texas.Dealing with damping-off-(Trade Journal) Weiland, G.E., Santamaria, L. 2013. Dealing with damping-off. Digger. April 2013: 41-45.Forest nurseries face critical choices with the loss of methyl bromide fumigation-(Peer Reviewed Journal) Weiland, G.E., Littke, W.R., Haase, D.L. 2013. Forest nurseries face critical choices with the loss of methyl bromide fumigation. California Agriculture. 67(3):153-161.Efficacy of management tools for control of Pythium root rot of Douglas fir seedlings, 2010-(Peer Reviewed Journal) Grunwald, N.J., Press, C.M., Rolfe, K.J., Weiland, G.E., Davis, E.A. 2013. Efficacy of management tools for control of Pythium root rot of Douglas fir seedlings, 2010. Plant Disease Management Reports. 7:OT010.Pathogenicity and virulence of Pythium species obtained from forest nursery soils on Douglas-fir seedlings-(Peer Reviewed Journal) Weiland, G.E., Beck, B.R., Davis, E.A. 2013. Pathogenicity and virulence of Pythium species obtained from forest nursery soils on Douglas-fir seedlings. Plant Disease. 97: 744-748.An aversion to Verticillium-(Trade Journal) Weiland, G.E. 2013. An aversion to Verticillium. Digger. February 2013: 33-37.Population structure and genetic diversity of three species of Pythium isolated from forest tree nursery soils in Oregon and Washington-(Abstract Only) Garrido, P., Garzon, C., Grunwald, N.J., Weiland, G.E. 2012. Population structure and genetic diversity of three species of Pythium isolated from forest tree nursery soils in Oregon and Washington. Phytopathology. 515.Management of Phytophthora cinnamomi root rot disease of blueberry with gypsum and compost-(Abstract Only) Yeo, J., Weiland, G.E., Sullivan, D.M., Bryla, D.R. 2013. Management of Phytophthora cinnamomi root rot disease of blueberry with gypsum and compost. Meeting Abstract. Meeting booklet.Activity of meadowfoam (Limnanthes alba) seed meal glucolimnanthin degradation products against soilborne pathogens-(Peer Reviewed Journal) Zasada, I.A., Weiland, G.E., Reed, R.L., Stevens, J.F. 2011. Activity of meadowfoam (Limnanthes alba) seed meal glucolimnanthin degradation products against soilborne pathogens. Journal of Agricultural and Food Chemistry. 60:339-345.Application of biocontrol agents in forest nurseries-(Proceedings) Weiland, G.E., Littke, W.R., Browning, J.I., Edmonds, R., Johnson, N. 2011. Application of biocontrol agents in forest nurseries. Proceedings of Methyl Bromide Alternatives Conference, 10/31/11-11/2/11 in San Diego, CA.The effects of methyl bromide alternatives on soil and seedling microbial populations, weeds, and seedling morphology in Oregon and Washington forest tree nurseries-(Peer Reviewed Journal) Weiland, G.E., Leon, A.L., Edmonds, R.L., Littke, W.R., Browning, J.E., Rose, R., Cherry, M., Davis, E.A., Beck, B.R., Miller, T. 2011. The effects of methyl bromide alternatives on soil and seedling microbial populations, weeds, and seedling morphology in Oregon and Washington forest tree nurseries. Canadian Journal of Forest Research. 41(8):1885-1896.Soil-Pest Relationships-(Book / Chapter) Weiland, G.E. 2012. Soil-pest relationships. In: Cram M.M., Frank M.S., Mallams K.M. Forest Nursery Pests. Washington (DC): USDA Forest Service Agriculture Handbook 680: 16-19.Pythium Root Rot-(Book / Chapter) Weiland, G.E. 2012. Soil-pest relationships. In: Cram M.M., Frank M.S., Mallams K.M. Forest Nursery Pests. Washington (DC): USDA Forest Service Agriculture Handbook 680: 129-131.Influence of Isolation method on mecovery of Pythium species from forest nursery soils in Oregon and Washington-(Peer Reviewed Journal) Weiland, G.E. 2011. Influence of isolation method on recovery of Pythium species from forest nursery soils in Oregon and Washington. Plant Disease. 95:547-553.Aggressiveness of Phytophthora cactorum, P. citricola I, and P. plurivora from European Beech-(Peer Reviewed Journal) Weiland, G.E., Nelson, A.H., Hudler, G.W. 2010. Aggressiveness of Phytophthora cactorum, P. citricola I, and P. plurivora from European beech. Plant Disease. 94(8):1009-1014.Assessment of Pythium Diversity from Forest Nurseries-(Abstract Only) Weiland, G.E. 2010. Assessment of Pythium diversity from forest nurseries. Phytopathology. 100(6S):S153Prevalence, distribution and identification of Phytophthora species from bleeding canker on European beech-(Peer Reviewed Journal) Nelson, A., Weiland, G.E., Hudler, G. 2010. Prevalence, distribution and identification of Phytophthora species from bleeding canker on European beech. Phytopathology. 28(3):150-158.Pythium Species Associated with Forest Tree Nurseries of Oregon and Washington-(Proceedings) Weiland, G.E. 2010. Pythium species associated with forest tree nurseries of Oregon and Washington. Proceedings of the 7th Meeting of the International Union Of Forestry Research Organization  Working Party 7.03.04 Diseases and Insects in Forest Nurseries. p. 104-108.Pythium and Fusarium Species Associated with Production of Douglas-Fir Seedlings-(Proceedings) Weiland, G.E., Littke, W., Browning, J., Rose, R., Edmonds, B., Leon, A. 2009. Pythium and Fusarium species associated with production of douglas-fir seedlings. Proceedings of International Research Conference on Methyl Bromide Alternatives. Available: http://www.mbao.org/2009/Proceedings/027WeilandJMBAONov09.pdfPythium species Associated with Forest Tree Nurseries of Oregon and Washington-(Abstract Only) Weiland, G.E. 2009. Pythium species Associated with Forest Tree Nurseries of Oregon and Washington. International Union Of Forestry Research Organization Book of Abstracts.Effects of Mefenoxam, Phosphonate, and Paclobutrazol on In Vitro Characteristics of Phytophthora cactorum and P. citricola and on Canker Size of European Beech-(Peer Reviewed Journal) Weiland, G.E., Nelson, A., Hudler, G. 2009. Effects of mefenoxam, phosphonate, and paclobutrazol on in vitro characteristics of Phytophthora cactorum and P. citricola and on canker size of European Beech. Plant Disease. 93(7):741-746.Impact of Fumigation on Pythium Species Associated with Forest Tree Nurseries of Oregon and Washington-(Abstract Only) Weiland, G.E. 2009. Impact of fumigation on Pythium species associated with forest tree nurseries of Oregon and Washington. American Phytopathological Society Abstracts.Response of Selected Woody Species to Inoculation with Phytophthora citricola and P. cactorum from European Beech Using Multiple Inoculation Methods-(Abstract Only) Nelson, A.H., Weiland, G.E., Hudler, G.W. 2009. Response of selected woodyspecies to inoculation with Phytophthora citricola and P. cactorum from European beech using multiple inoculation methods. Phytopathology Supplement; APSnet (Plant Pathology Online). 98:S112.Aggressiveness of Phytophthora cactorum and Phytophthora citricola isolates on European Beech and Lilac-(Abstract Only) Weiland, G.E., Nelson, A., Hudler, G. 2008. Aggressiveness of Phytophthora cactorum and Phytophthora citricola isolates on European beech and lilac. Phytopathology Supplement; APSnet (Plant Pathology Online). 98:S168.  ARS News ArticlesNo news articles listed for this employee.


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