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                    U.S. DEPARTMENT OF AGRICULTURE
 National Arboretum: Washington, DC
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Richard T Olsen

                                                                (PhD)
                        Office of The Director

                        




                        
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                            ProjectsAgreement Between the United States National Arboretum and the National Bonsai Foundation
                                                    Non-Funded Cooperative Agreement
                                                                    (N)Accession Number: 439189Agreement Between the United States National Arboretum and the Friends of the National Arboretum
                                                    Non-Funded Cooperative Agreement
                                                                    (N)Accession Number: 439615**Publications**
                                                (Clicking on the reprint icon
                                                    Reprint Icon
                                                    will take you to the publication reprint.)Tsuga ‘Traveler’ and ‘Crossroad’ – the first adelgid-resistant interspecific hemlock hybrids
                                                        

- (Peer Reviewed Journal)Bentz, S.E., Gouker, F.E., Olsen, R.T., Pooler, M.R. 2023. Tsuga ‘Traveler’ and ‘Crossroad’ – the first adelgid-resistant interspecific hemlock hybrids. HortScience. 58(3):289–290. https://doi.org/10.21273/HORTSCI16918-22.Genetic diversity and population structure of Chionanthus virginicus L. throughout the eastern and southern range within the United States
                                                        

- (Peer Reviewed Journal)Wadl, P.A., Rinehart, T.A., Olsen, R.T., Waldo, B.D., Kirkbride, J.H. 2021. Genetic diversity and population structure of Chionanthus virginicus L. throughout the eastern and southern range within the United States. Journal of the American Society for Horticultural Science. https://doi.org/10.21273/JASHS05095-21.Faith and hope

- (Other)Ploidy variation in Fraxinus L. (Oleaceae) of eastern North America

- (Peer Reviewed Journal)Whittemore, A.T., Campbell, J.J., Xia, Z., Carlson, C.H., Atha, D., Olsen, R.T. 2018. Ploidy variation in Fraxinus L. (Oleaceae) of eastern North America. International Journal of Plant Sciences. 179(5):377-389. Available: https://www.journals.uchicago.edu/doi/10.1086/696688.Test of a natural enemy hypothesis on plant provenance: Spider abundance in native and exotic ornamental landscapes

- (Peer Reviewed Journal)Greenstone, M.H., Cornelius, M.L., Olsen, R.T., Payton, M.E. 2017. Test of a natural enemy hypothesis on plant provenance: Spider abundance in native and exotic ornamental landscapes. Journal of Entomological Science. 52(4):340-351.Biological control of sentinel egg masses of the exotic invasive stink bug halyomorpha halys (Stål) in Mid-Atlantic USA ornamental landscapes
                                                        

- (Peer Reviewed Journal)Cornelius, M.L., Dieckhoff, C., Hoelmer, K.A., Olsen, R.T., Weber, D.C., Herlihy, M.V., Talamas, E.J., Vinyard, B.T., Greenstone, M.H. 2016. Biological control of sentinel egg masses of the exotic invasive stink bug halyomorpha halys (Stål) in Mid-Atlantic USA ornamental landscapes. Biological Control. 103:11-20.Genetic relationships of boxwood (Buxus L.) accessions based on genic simple sequence repeat markers

- (Peer Reviewed Journal)Thammina, C., Olsen, R.T., Kramer, M.H., Pooler, M.R. 2016. Evaluation of genetic diversity and relatedness of boxwood accessions using genic simple Ssquence repeat markers. Journal of the American Society for Horticultural Science. DOI 10.1007/s10722-016-0436-6.Use of mycelium and detached leaves in bioassays for assessing resistance to boxwood blight

- (Peer Reviewed Journal)Guo, Y.H., Olsen, R.T., Kramer, M.H., Pooler, M.R. 2016. Use of mycelium and detached leaves in bioassays for assessing resistance to boxwood blight. Plant Disease. 100:1622-2626.Your U.S. National Arboretum: A not so hidden gem

- (Abstract Only)Evaluating boxwood (Buxus spp.) susceptibility to Calonectria pseudonaviculata by inoculating cuttings from the National Boxwood Collection at the U.S. National Arboretum

- (Peer Reviewed Journal)Shishkoff, N., Daughtrey, M.L., Olsen, R.T., Aker, S.M. 2015. Evaluating boxwood (Buxus spp.) susceptibility to Calonectria pseudonaviculata by inoculating cuttings from the National Boxwood Collection at the U.S. National Arboretum. Plant Health Progress. 16:11-15.Effective bioassays for evaluating boxwood blight (Calonectria pseudonaviculata) susceptibility using detached stem inoculations

- (Peer Reviewed Journal)Guo, Y., Olsen, R.T., Kramer, M.H., Pooler, M.R. 2015. Effective bioassays for evaluating boxwood blight (Calonectria pseudonaviculata) susceptibility using detached stem inoculations. HortScience. 50(2):268-271.Development of polymorphic genic-SSR markers by cDNA library sequencing in boxwood, Buxus spp. (Buxaceae)

- (Peer Reviewed Journal)Thammina, C., Olsen, R.T., Wight-Malapi, M., Crouch, J., Pooler, M.R. 2014. Development of polymorphic genic-SSR markers by cDNA library sequencing in boxwood, Buxus spp. (Buxaceae). Applications in Plant Sciences. 9(12):1400095.Asian germplasm in American horticulture: new thoughts on an old theme

- (Peer Reviewed Journal)Olsen, R.T. 2014. Asian germplasm in American horticulture: new thoughts on an old theme. HortScience. 48:1073-1077.In vitro induction of polyploidy in Cercis glabra Pamp

- (Peer Reviewed Journal)Nadler, J.D., Pooler, M.R., Olsen, R.T., Coleman, G. 2012. In vitro induction of polyploidy in Cercis glabra Pamp. Scientia Horticulturae. 148:126-130.Plant breeding for harmony between agriculture and the environment

- (Peer Reviewed Journal)Brummer, E., Barber, W.T., Collier, S., Cox, T.S., Johnson, R., Murray, S., Olsen, R.T., Pratt, R., Thro, A. 2012. Plant breeding for harmony between agriculture and the environment. Frontiers in Ecology and the Environment. 9:561-568.Neotypification of Catalpa speciosa (Bignonioides)

- (Peer Reviewed Journal)Kirkbride, J.H., Olsen, R.T. 2011. Neotypification of Catalpa speciosa (Bignonioides). Taxon. 60(6):1760-1763.Identity of Catalpa tibetica (Bignoniaceae)

- (Peer Reviewed Journal)Kirkbride, J.H., Olsen, R.T. 2011. Identity of Catalpa tibetica (Bignoniaceae). Journal of Botanical Research Institute of Texas. 5(2):625-631.Ulmus americana is a polyploid complex

- (Peer Reviewed Journal)Whittemore, A.T., Olsen, R.T. 2011. Ulmus americana is a polyploid complex. Journal of Botanical Research Institute of Texas. 98(4):754-760.Mycosphaerella nyssicola revisited: characterization of a species distinct from M. punctiformis

- (Peer Reviewed Journal)Minnis, A., Rossman, A.Y., Olsen, R.T. 2011. Mycosphaerella nyssicola revisited: characterization of a species distinct from M. punctiformis. Mycotaxon. 155:311-322.Sphaerographium nyssicola Minnis, Rossman & D.F. Farr, sp. nov.

- (Peer Reviewed Journal)Minnis, A., Rossman, A.Y., Farr, D., Olsen, R.T. 2010. Sphaerographium nyssicola Minnis, Rossman & D.F. Farr, sp. nov. Persoonia: Molecular Phylogeny and Evolution of Fungi. 25:122-123.Development of simple sequence repeat markers for Chionanthus retusus (Oleaceae) and effective discrimination of closely related taxa

- (Peer Reviewed Journal)Arias, R.S., Techen, N., Rinehart, T.A., Olsen, R.T., Kirkbride, J.H., Scheffler, B.E. 2010. Development of simple sequence repeat markers for Chionanthus retusus (Oleaceae) and effective discrimination of closely related taxa. HortScience. 46(1):23-29.Evaluating fertility of triploid clones of hypericum androsaemum L. for use as non-invasive landscape plants

- (Peer Reviewed Journal)Trueblood, C.E., Ranney, T.G., Lynch, N.P., Neal, J.C., Olsen, R.T. 2010. Evaluating fertility of triploid clones of hypericum androsaemum L. for use as non-invasive landscape plants. HortScience. 45:1026-1028.Validation of the hybrid flowering cherry Prunus xincam Ingram (Rosaceae)

- (Peer Reviewed Journal)Olsen, R.T. and Whittemore, A.T. 2009. Validation of the hybrid flowering cherry Prunus xincam (Rosaceae). Novon. 19:490-493.Development of SSR markers for Chionanthus retusus (Oleaceae) and effective discrimination of closely related taxa

- (Other)Arias, R.S., Techen, N., Rinehart, T.A., Olsen, R.T., Kirkbride, J.H., Scheffler, B.E. 2009. Development of SSR markers for Chionanthus retusus (Oleaceae) and effective discrimination of closely related taxa. American Society of Horticulture Science Meeting, July 24-28, 2008, St. Louis, MO. meeting Prodeedings. 44(4):1007.Evaluation of flowering cherry (Prunus L.) species, hybrids, and cultivars using SSR markers

- (Peer Reviewed Journal)Ma, H., Olsen, R., Pooler, M, Kramer, Matthew. 2009. Evaluation of Flowering Cherry Species, Hybrids, and Cultivars Using Simple Sequence Repeat Markers. Journal of the American Society for Horticultural Science. 134:435-444.Evaluation of Hemlock (Tsuga)Species and Hybrids for Resistance to Adelges tsugae (Hemiptera:Adelgidae) Using Artificial Infestation

- (Peer Reviewed Journal)Montgomery, M.E., Bentz, S.E., Olsen, R.T. 2009. Evaluation of hemlock (Tsuga) species and hybrids for resistance to Adelges tsugae (Hemiptera: Adelgidae) using artificial inoculation. Journal of Economic Entomology. 102:1247-1254.Evaluation of a 15-year-old Carolina silverbell provenance trial

- (Proceedings)Olsen, R.T. 2009. Evaluation of a 15-year-old Carolina silverbell provenance trial. Proceedings of the 53rd Annual Southern Nursery Association Research Conference. 53:181-185.Gene banks offer breeders access to germplasm: Germplasm collections help to preserve genetic diversity

- (Trade Journal)Robbins, J., Widrlechner, M.P., Olsen, R.T., Reed, S.M., Meerow, A.W., Hummer, K.E., Bretting, P.K., Allenstein, P., Krautmann, M. 2008. Gene banks offer breeders access to germplasm: Germplasm collections help to preserve genetic diversity. Nursery Management and Production. 24(5):53-58.Resistance of Hemlock species and hybrids to Hemlock woolly Adelgid

- (Abstract Only)Bentz, S.E., Montgomery, M.E., Olsen, R.T. 2008. Resistance of hemlock species and hybrids to hemlock woolly adelgid. Fouth Symposium on Hemlock Woolly Adelgid in the Eastern United States, 12-14 February 2008.Prunus x sieboldii

- (Trade Journal)Olsen, R.T., 2008. Prunus x Sieboldii. 2008. American Journeyman. vol 207-66.POLYPOID BREEDING IN HYPERICUM ANDROSAEMUM L

- (Abstract Only)Olsen, R.T., and Ranney, T.G. 2006. Polyploid breeding in Hypericum androsaemum L. HortScience. 41:952.
                    ARS News Articles
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                                                USDA Scientists Help Select U.S. Dogwood Trees for Planting in Japanitem
                                                Potential Hemlock Hybrids Tolerant to Invasive Hemlock Woolly Adelgid


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