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United States Department of Agriculture

Agricultural Research Service

Daniel Kluepfel
Research Leader


Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Vineyard soil bacterial diversity and composition revealed by 16S rRNA genes: differentiation by geographic features Reprint Icon -
Burns, K.N., Kluepfel, D.A., Strauss, S.L., Bokulich, N.A., Cantu, D., Steenwerth, K.L. 2015. Vineyard soil bacterial diversity and composition revealed by 16S rRNA genes: differentiation by geographic features. Soil Biology and Biochemistry. 91:232-247. doi: 10.1016/j.soilbio.2015.09.002.
Vineyard soil bacterial diversity and composition revealed by 16S rRNA genes: Differentiation by vineyard management -
Burns, K.N., Bokulich, N.A., Cantu, D., Greenhut, R.F., Kluepfel, D.A., O'Geen, A.T., Strauss, S.L., Steenwerth, K.L. 2015. Vineyard soil bacterial diversity and composition revealed by 16S rRNA genes: Differentiation by vineyard management. Journal of Soil Biology and Biochemistry. 91:232-247. doi: 10.1016/j.soilbio.2015.09.002.
Anaerobic soil disinfestation: a chemical-independent approach to pre-plant control of plant pathogens -
Strauss, S.L., Kluepfel, D.A. 2015. Anaerobic soil disinfestation: a chemical-independent approach to pre-plant control of plant pathogens. Journal of Integrative Agriculture. 14(11):2309-2318. doi: 10.1016/S2095-3119(15)61118-2.
Patterns of drought-induced embolism formation and spread in living walnut saplings visualized using x-ray microtomography -
Knipfer, T., Brodersen, C., Zedan, A., Kluepfel, D.A., Mcelrone, A.J. 2015. Patterns of drought-induced embolism formation and spread in living walnut saplings visualized using x-ray microtomography. Tree Physiology. doi: 10.1093/treephys/tpv040.
Identification of Juglans wild relatives resistant to crown gall caused by Agrobacterium tumefaciens Reprint Icon -
Kluepfel, D.A., Mcclean, A.E., Aradhya, M.K., Moersfelder, J.W. 2015. Identification of Juglans wild relatives resistant to crown gall caused by Agrobacterium tumefaciens. Acta Horticulturae. 1074:87-94.
Genetic conservation, characterization and utilization of wild relatives of fruit and nut crops at the USDA Germplasm Repository in Davis, California Reprint Icon -
Aradhya, M.K., Preece, J.E., Kluepfel, D.A. 2015. Genetic conservation, characterization and utilization of wild relatives of fruit and nut crops at the USDA Germplasm Repository in Davis, California. Acta Horticulturae. 1074:95-104.
Impact of biological amendments on Agrobacterium tumefaciens soil survival Reprint Icon -
Strauss, S.L., Stover, D.A., Kluepfel, D.A. 2014. Impact of biological amendments on Agrobacterium tumefaciens soil survival. Applied Soil Ecology. 87:39-48.
Effect of anaerobic soil disinfestation and vermicompost on soilborne phytopathogenic agents under tree-crop nursery conditions -
Development of disease-resistant walnut rootstocks: Integration of conventional and genomic approaches -
Kluepfel, D.A., Browne, G.T., Mckenry, M., Hasey, J., Leslie, C., Aradhya, M.K., Hackett, W., Preece, J.E., Bostock, R., Seybold, S. 2014. Development of disease-resistant walnut rootstocks: Integration of conventional and genomic approaches. Walnut Research Conference. 77-87.
Incidence of Agrobacterium tumefaciens biovar 1 in and on ‘Paradox’ (Juglans hindsii x Juglans regia) walnut seed collected from commercial nurseries Reprint Icon -
Yakabe, L.E., Parker, S.R., Kluepfel, D.A. 2014. Incidence of Agrobacterium tumefaciens biovar 1 in and on ‘Paradox’ (Juglans hindsii x Juglans regia) walnut seed collected from commercial nurseries. Plant Disease. 98:766-770.
Evaluating paradox walnut rootstocks for resistance to Armillaria root disease Reprint Icon -
Baumgartner, K., Fujiyoshi, P.T., Browne, G.T., Leslie, C., Kluepfel, D.A. 2013. Evaluating paradox walnut rootstocks for resistance to Armillaria root disease. HortScience. 48:68-72.
Identification of tree-crop rootstocks with resistance to Armillaria root disease. Reprint Icon -
Baumgartner, K., Fujiyoshi, P.T., Kluepfel, D.A., Browne, G.T., Leslie, C. 2012. Identification of tree-crop rootstocks with resistance to Armillaria root disease.. American Phytopathological Society Abstracts. 23-0.
Comparative genomics of plant-associated Pseudomonas spp.: Insights into diversity and inheritance of traits involved in multitrophic interactions -
Loper, J.E., Hassan, K.A., Mavrodi, D., Davis, E.W., Lim, C., Shaffer, B.T., Elbourne, L.H., Stockwell, V.O., Hartney, S.L., Breakwell, K., Henkels, M.D., Tetu, S.G., Rangel, L.I., Kidarsa, T.A., Wilson, N.L., Van Mortel, J., Song, C., Blumhagen, R., Radune, D., Hostetler, J.B., Brinkac, L.M., Durkin, A., Kluepfel, D.A., Wechter, W.P., Anderson, A.J., Kim, Y., Pierson Iii, L.S., Pierson, E.A., Lindow, S.E., Raaijmakers, J.M., Weller, D.M., Thomashow, L.S., Allen, A.E., Paulsen, I.I. 2012. Comparative genomics of plant-associated Pseudomonas spp.: Insights into diversity and inheritance of traits involved in multitrophic interactions. PLoS Genetics. 8(7):e1002784.
The quest to identify disease resistance in the USDA-ARS Juglans germplasm collection Reprint Icon -
Kluepfel, D.A., Aradhya, M.K., Browne, G.T., Mckenry, M.V., Leslie, C.A., Mcclean, A.E., Moersfelder, J.W., Velasco, D.M., Baumgartner, K. 2012. The quest to identify disease resistance in the USDA-ARS Juglans germplasm collection. Acta Horticulturae. 948:105-111.
Soil solarization and biological control for managing Mesocriconema xenoplax and Short Life in a newly established peach orchard -
Nyczepir, A.P., Kluepfel, D.A., Waldrop, V., Wechter, W.P. 2012. Soil solarization and biological control for managing Mesocriconema xenoplax and Short Life in a newly established peach orchard. Plant Disease. 96:1309-1314.
Proceedings of the first international symposium on wild relatives of subtropical and temperate fruit and nut crops -
Kluepfel, D.A., Aradhya, M.K., (Editors), 2012. Proceedings of the First International Symposium on Wild Relatives of Subtropical and Temperate Fruit and Nut Crops. Belgium. Acta Horticulturae 948.
Novel primers for detection of genetically diverse virulent Agrobacterium tumefaciens bv1 strains Reprint Icon -
Yakabe, L.E., Maccree, M.M., Sudarshana, P., Mcclean, A.E., Parker, S.R., Wechter, W.P., Presting, G., Kluepfel, D.A. 2012. Novel primers for detection of genetically diverse virulent Agrobacterium tumefaciens bv1 strains. Journal of General Plant Pathology. DOI: 10.1007/s10327-012-0364-z.
Clonal propagation of walnut rootstock genotypes for genetic improvement 2011 -
Clonal propagation of walnut rootstock genotypes for genetic improvement 2011. Walnut Research Conference. 2011:103-128.
Evaluation of wild juglans species for crown gall resistance -
Kluepfel, D.A., Mcclean, A.E., Aradhya, M.K., Moersfelder, J.W., Dull, A., Marsden, C., Hackett, W. 2012. Evaluation of wild juglans species for crown gall resistance. Walnut Research Conference. 313-317.
Evaluation of wild walnut Juglans spp. for resistance to crown gall disease Reprint Icon -
Kluepfel, D.A., Aradhya, M.K., Moersfelder, J.W., Mcclean, A.E., Hackett, W.P., Dull, A.J. 2011. Evaluation of wild walnut Juglans spp. for resistance to crown gall disease. Phytopathology. 101:S92.
Evaluations and modifications of semi-selective media for improved isolation of Agrobacterium tumefaciens biovar 1 from cultivated walnut Reprint Icon -
Yakabe, L.E., Parker, S.R., Kluepfel, D.A. 2011. Evaluations and modifications of semi-selective media for improved isolation of Agrobacterium tumefaciens biovar 1 from cultivated walnut. Phytopathology. 101:S196.
FIRST INTERNATIONAL SYMPOSIUM ON WILD RELATIVES OF SUBTROPICAL AND TEMPERATE FRUIT AND NUT CROPS Reprint Icon -
Koehmstedt, A., Velasco, D., Aradhya, M.K., Kluepfel, D.A. 2011. FIRST INTERNATIONAL SYMPOSIUM ON WILD RELATIVES OF SUBTROPICAL AND TEMPERATE FRUIT AND NUT CROPS. Symposium Proceedings. 51:38-39.
Evaluation of wild Juglans species for crown gall resistance Reprint Icon -
Kluepfel, D.A., Aradhya, M.K., Moersfelder, J.W., Mcclean, A.E., Maccree, M.M., Hackett, W. 2011. Evaluation of wild Juglans species for crown gall resistance. Walnut Research Conference. 2010:239-252.
Clonal Propagation of walnut rootstock genotypes for genetic improvement 2010 Reprint Icon -
Hackett, W., Leslie, C., Grant, J., Lampinen, B., Mcgranahan, G., Anderson, K., Beede, B., Buchner, R., Caprile, J., Debuse, C., Hasey, J., Manterola, N., Robinson, R., Kluepfel, D.A., Browne, G.T., Mckenry, M. 2011. Clonal Propagation of walnut rootstock genotypes for genetic improvement 2010. Walnut Research Conference. 2010:65-82.
Genomic Diversity of Biocontrol Strains of Pseudomonas spp. Isolated from Aerial or Root Surfaces of Plants -
Loper, J.E., Davis, E.W., Lim, K., Hassan, K., Wilson, N., Hartney, S., Shaffer, B.T., Stockwell, V., Henkels, M.D., Shen, K., Blumhagen, R.Z., Mavrodi, D., Van Mortel, J., Song, C., Radune, D., Hostetler, J., Kluepfel, D.A., Wechter, W.P., Anderson, A., Young, C., Pierson, L., Pierson, E., Lindow, S., Raaijmakers, J., Weller, D.M., Thomashow, L.S., Allen, A., Paulsen, I. 2010. Genomic diversity of biocontrol strains of Pseudomonas spp. isolated from aerial or root surfaces of plants. International Symposium on Microbiology of Aerial Plant Surfaces Program Book. p.43.
THE ROLE OF TYLOSES IN CROWN HYDRAULIC FAILURE OF MATURE WALNUT TREES AFFLICTED WITH APOPLEXY DISORDER -
Mcelrone, A.J., Grant, J.A., Kluepfel, D.A. 2010. THE ROLE OF TYLOSES IN CROWN HYDRAULIC FAILURE OF MATURE WALNUT TREES AFFLICTED WITH APOPLEXY DISORDER. Tree Physiology. 30:761-772.
Evaluation of wild juglans species for crown gall resistance Reprint Icon -
Kluepfel, D.A., Aradhya, M.K., Maccree, M., Moersfelder, J.W., Mcclean, A.E., Hackett, W. 2011. Evaluation of wild juglans species for crown gall resistance. Walnut Research Conference. pp. 239-242.
Effect of pre-plant soil fumigants on Agrobacterium tumefaciens, pythiaceous species, and subsequent soil recolonization by A. tumefaciens -
Yakabe, L., Parker, S., Kluepfel, D.A. 2010. Effect of pre-plant soil fumigants on Agrobacterium tumefaciens, pythiaceous species, and subsequent soil recolonization by A. tumefaciens. Crop Protection. 29:583-590.
DETECTION AND IMPLICATIONS OF EARLY AGROBACTERIUM TUMEFACIENS INFECTION OF PARADOX SEEDS AND SEEDLINGS Reprint Icon -
Kluepfel, D.A., Yakabe, L., Parker, S., Mcclean, A.E., Maccree, M.M. 2010. DETECTION AND IMPLICATIONS OF EARLY AGROBACTERIUM TUMEFACIENS INFECTION OF PARADOX SEEDS AND SEEDLINGS. Acta Horticulturae. 861:497-500.
CROWN GALL INCIDENCE: SEEDLING PARADOX WALNUT ROOTSTOCK VERSUS OWN-ROOTED ENGLISH WALNUT TREES Reprint Icon -
Hasey, J., Lampinen, B., Anderson, K., Grant, J., Caprile, J., Beede, R., Kluepfel, D.A. 2010. CROWN GALL INCIDENCE: SEEDLING PARADOX WALNUT ROOTSTOCK VERSUS OWN-ROOTED ENGLISH WALNUT TREES. Acta Horticulturae. 861:453-455.
Clonal Propagation of Walnut Rootstock Genotypes for Genetic Improvement 2009 -
Hackett, W., Leslie, C., Mcgranahan, G., Kluepfel, D.A., Lampinen, B., Anderson, K., Beede, B., Buchner, R., Debuse, C., Grant, J., Hasey, J., Caprile, J., Manterola, N. 2010. Clonal Propagation of Walnut Rootstock Genotypes for Genetic Improvement 2009. Walnut Research Conference. pp 71-86.
GENETIC LOCI INVOLVED IN RUBRIFACINE PRODUCTION IN THE WALNUT PATHOGEN BRENNARIA RUBRIFACIENS Reprint Icon -
Mcclean, A.E., Kluepfel, D.A. 2009. GENETIC LOCI INVOLVED IN RUBRIFACINE PRODUCTION IN THE WALNUT PATHOGEN BRENNARIA RUBRIFACIENS. Phytopathology. 99:145-151.
PSEUDOMONAS GENE EXPRESSION DURING GROWTH IN THE RHIZOSPHERE -
Gonzalez, E.T., Wechter, W.P., Kluepfel, D.A. 2008. Pseudomonas gene expression during growth in the rhizosphere. Phytopathology. 98 (6 supplements):S191
Involvement of sensor kinase gene (skrp 1122) for biocontrol activity by Pseudomonas synxantha BG33R -
Fang, G.C., Waldrop, V., Wechter, W.P., Kluepfel, D.A. 2008. Involvement of sensor kinase gene (skrp 1122) for biocontrol activity by Pseudomonas synxantha BG33R. Phytopathology. 98 (6 supplements):S52. . American Phytopathological Society Annual Meeting.
Impact of Pseudomonas-based biocontrol agents and solarization on Mesocriconema xenoplax populations and tree survival in a peach tree short life site -
Nyczepir, A.P., Kluepfel, D.A., Wechter, W.P. 2008. Impact of Pseudomonas-based biocontrol agents and solarization on Mesocriconema xenoplax populations and tree survival in a peach tree short life site [abstract]. International Congress of Nematology. 5:299.
ENHANCED DETECTION AND ISOLATION OF THE WALNUT PATHOGEN BRENNARIA RUBRIFACIENS: CAUSAL AGENT OF DEEP BARK CANKER -
Mcclean, A.E., Sudarshana, P., Kluepfel, D.A. 2008. Enhanced detection and isolation of the walnut pathogen brennaria rubrifaciens: causal agent of deep bark canker. European Journal of Plant Pathology. 10.1007/s 10658-008-9308
Biology of Brenneria Rubrifaciens: Screening for genes involved in pathogenesis -
Mcclean, A.E., Kluepfel, D.A. 2008. Biology of Brenneria Rubrifaciens: Screening for genes involved in pathogenesis . Walnut Research Conference.
Assessing the Genetic Diversity of Agrobacterium Tumefaciens in CA Walnut Growing Regions and Resistance to the Biocontrol Agent, A. Rhizogenes K84 -
Gonzalez, E.T., Maccree, M.M., Zaid, M., Kluepfel, D.A. 2008. Assessing the Genetic Diversity of Agrobacterium Tumefaciens in CA Walnut Growing Regions and Resistance to the Biocontrol Agent, A. Rhizogenes K84. Walnut Research Conference.
Evaluaton of Wild Juglans Species for Crown Gall Resistance -
Stover, E.W., Maccree, M.M., Aradhya, M.K., Mcclean, A.E., Kluepfel, D.A. 2008. Evaluaton of Wild Juglans Species for Crown Gall Resistance. Walnut Research Conference.
Nonchemical alternatives for managing phytoparasitic nematodes in peach: biological agents, solarization, preplant groundcovers -
Nyczepir, A.P., Kluepfel, D.A. 2008. Nonchemical alternatives for managing phytoparasitic nematodes in peach: biological agents, solarization, preplant groundcovers. In: Proceedings of the Southeastern Peach Convention, January 11-13, 2008, Savannah, Georgia. p. 12-15.
A BROAD-SPECTRUM ANTAGONISTIC ACTIVITY OF THE BIOCONTROL AGENT PSEUDOMONAS SYNXANTHA BG33R -
Fang, G.C., Wechter, W.P., Kluepfel, D.A. 2007. A BROAD-SPECTRUM ANTAGONISTIC ACTIVITY OF THE BIOCONTROL AGENT PSEUDOMONAS SYNXANTHA BG33R. American Phytopathological Society Abstracts.
SOIL MORPHOLOGY, DEPTH AND GRAPEVINE ROOT FREQUENCY INFLUENCE MICROBIAL COMMUNITIES IN A PINOT NOIR VINEYARD -
Steenwerth, K.L., Drenovsky, R.E., Lambert, J.J., Smart, D.R., Kluepfel, D.A., Scow, K.M. 2008. SOIL MORPHOLOGY, DEPTH AND GRAPEVINE ROOT FREQUENCY INFLUENCE MICROBIAL COMMUNITIES IN A PINOT NOIR VINEYARD. Soil Biology and Biochemistry. 40:1330-1340.
Impact of solarization, rootstock and Pseudomonas synxantha on Criconemoides xenoplax populations and tree growth in peach tree short life site -
Nyczepir, A.P., Kluepfel, D.A. 2007. Impact of solarization, rootstock and Pseudomonas synxantha on Criconemoides xenoplax populations and tree growth in peach tree short life site [abstract]. Journal of Nematology. 39:75.
Microarray analysis: Uses and Limitations -
Wechter, W.P., Levi, A., Kluepfel, D.A., Gonzalez, E.T., Presting, G. 2007. Microarray Analysis: Uses and Limitations. HortScience. 42:477.
REAL-TIME PCR DETECTION AND DEVELOPMENT OF A BIOASSAY FOR THE DEEP BARK CANKER PATHOGEN, BRENNARIA RUBRIFACIENS -
Mcclean, A.E., Sudarshana, P., Kluepfel, D.A. 2007. Real-time pcr detection and development of a bioassay for the deep bark canker pathogen, brennaria rubrifaciens. Walnut Research Conference.
EVALUATION OF WILD JUGLANS SPECIES FOR CROWN GALL RESISTANCE -
Stover, E.W., Maccree, M.M., Aradhya, M.K., Mcclean, A.E., Kluepfel, D.A. 2007. Evaluation of wild juglans species for crown gall resistance. Walnut Research Conference.
SEASONAL FLUCTUATION OF AGROBACTERIUM TUMEFACIENS POPULATIONS IN WALNUT ORCHARD SOIL -
Kluepfel, D.A., Sudarshana, P. 2006. Seasonal fluctuation of agrobacterium tumefaciens populations in walnut orchard soil. American Phytopathological Society Annual Meeting.
DETECTION OF BRENNARIA RUBRIFACIENS THE CAUSATIVE AGENT OF DEEP BARK CANKER (DBC)OF WALNUT -
Mcclean, A.E., Sudarshana, P., Kluepfel, D.A. 2006. Detection of brennaria rubrifaciens the causative agent of deep bark canker (dbc)of walnut. American Phytopathological Society Annual Meeting.
EFFECTS OF GRAPEVINE ROOTS, SOIL RESOURCES AND DEPTH ON SOIL MICROBIAL COMMUNITIES IN A PINOT NOIR VINEYARD -
Steenwerth, K.L., Parker, S., Kluepfel, D.A., Lambert, J., Smart, D.R. 2006. Effects of grapevine roots, soil resources and depth on soil microbial communities in a pinot noir vineyard. World Congress of Soil Science.
DEVELOPMENT OF A PCR-BASED METHOD FOR THE DETECTION OF BRENNARIA RUBRIFACIENS; THE CAUSAL AGENT OF DEEP BARK CANKER OF WALNUT -
Mcclean, A.E., Sudarshana, P., Kluepfel, D.A. 2006. Development of a pcr-based method for the detection of brennaria rubrifaciens; the causal agent of deep bark canker of walnut. Walnut Research Conference.
DEVELOPMENT OF A CULTURE-INDEPENDENT REAL-TIME PCR ASSAY FOR DETECTION OF AGROBACTERIUM TUMEFACIENS IN SOIL -
Sudarshana, P., Mcclean, A.E., Kluepfel, D.A. 2006. Development of a culture-independent real-time pcr assay for detection of agrobacterium tumefaciens in soil. Walnut Research Conference.
ANALYSIS OF SOIL PROPERTIES AND BACTERIAL GENERA INFLUENCING THE SOIL-BORNE CULTURABLE BACTERIAL COMMUNITY IN A CALIFORNIA GRAPEVINE VINEYARD -
Parker, S.R., Kluepfel, D.A., Steenwerth, K.L., Lambert, J., Smart, D. 2006. Analysis of soil properties and bacterial genera influencing the soil-borne culturable bacterial community in a california grapevine vineyard. American Phytopathological Society Abstracts.
EFFECT OF TEMPERATURE AND DETERGENTS ON AGROBACTERIUM TUMEFACIENS, THE CAUSAL PATHOGEN OF CROWN GALL DISEASE OF WALNUT -
Sudarshana, P., Mcclean, A.E., Kluepfel, D.A. 2006. Effect of temperature and detergents on agrobacterium tumefaciens, the causal pathogen of crown gall disease of walnut. American Phytopathological Society Abstracts.
GLOBAL GENE EXPRESSION OF PSEUDOMONAS PUTIDA KT2440 DURING GROWTH IN THE RHIZOSPHERE OF ARABIDOPSIS THALIANA -
Wechter, W.P., Kluepfel, D.A. 2005. Global gene expression of Pseudomonas Putida KT2440 during growth in the rhizosphere of Arabidopsis Thaliana [abstract]. Phytopathology 95 (6):S110.
INSERTIONS IN THE AVIRULENCE GENE AVRA ALTER THE VIRULENCE OF RALSTONIA SOLANACEARUM ON NICOTIANA TABACUM. -
Robertson, A.E., Fortnum, B.A., Wechter, W.P., Denny, T.P., Kluepfel, D.A. 2005. Insertions in the avirulence gene avra alter the virulence of Ralstonia solanacearum on Nicotiana tabacum. In: Allen, C., Prior, P., and Hayward, A.C., eds. Bacterial Wilt and the Disease and Ralstonia solanacearum species Complex. St. Paul, MN: APS Press. p 359-364.
MECHANIZATION HAS CONTRIBUTED TO THE SPREAD OF BACTERIAL WILT ON FLUE-CURED TOBACCO IN THE SOUTHEASTERN USA -
Fortnum, B.A., Kluepfel, D.A. 2005. Mechanization has contributed to the spread of bacterial wilt on flue-cured tobacco in the southeastern usa. Bacterial Wilt, The Disease and Ralstonia Solanacearum Species Complex.
INSERTIONS IN THE AVIRULENCE GENE AVRA ALTHER THE VIRULENCE OF RALSTONIA SOLANACEARUM ON NICOTIANA TABACUM -
Robertson, A.E., Fortnum, B.A., Wechter, W.P., Denny, T.P., Kluepfel, D.A. 2005. Insertions in the avirulence gene avra alther the virulence of ralstonia solanacearum on nicotiana tabacum. Bacterial Wilt, The Disease and Ralstonia Solanacearum Species Complex.
BIOLOGY AND MANAGEMENT OF REPLANT DISORDER AND LETHAL PHYTOPHTHORA CANKER -
Kluepfel, D.A., Browne, G.T. Biology and management of replant disorder and lethal phytophthora canker. Almond Industry Conference Proceedings. 2004
INVESTIGATION OF THE POSSIBLE CAUSES OF AN UNIDENTIFIED COTTON SEED ROT -
JONES, M.A., MUELLER, J., KLUEPFEL, D.A. INVESTIGATION OF THE POSSIBLE CAUSES OF AN UNIDENTIFIED COTTON SEED ROT. Cotton Incorporated Proceedings. 2002.
Last Modified: 8/26/2016
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