College of Agricultural Sciences

R. Contreras, Rothleutner, J. J., and Stockwell, V., “Breeding for fire blight resistance and sterility in Cotoneaster”, Proceedings of the 13th International Workshop on Fire Blight. Acta Hort, vol. 1056:221-223. 2014.

K. S. lattier and Contreras, R., “Chemical mutagenesis of Galtonia candicans Decne. results in altered morphology and reduced fertility”, Proc. 60th Ann. SNA Res. Conf. 60:XXX-XXX. 2015.

J. A. Schulze and Contreras, R., “Effect of ploidy level on vegetative propagation of two cytotypes of Prunus laurocerasus L. ‘Schipkaensis’.”, Combined Proceedings of the International Plant Propagators' Society 65. 2015.

J. J. Rothleutner, Contreras, R., and Stockwell, V., “Evaluation of fire blight resistance of 31 species of Cotoneaster”, Proc. 57th Ann. SNA Res. Conf., vol. 57:276-278. 2012.

R. Contreras and Friddle, M. W., “Fire blight resistance among interspecific and interploidy F1 hybrids of Cotoneaster”, Proc. 60th Ann. SNA Res. Conf. 60:XXX-XXX. 2015.

J. D. Lattier and Contreras, R., “Hybridization Studies in Lilacs”, Proc. 59th Ann. SNA Res. Conf. 59:229-234. 2014.

R. Contreras and Ruter, J. M., “Induced polyploidy in Japanese cedar”, Proc. 55th Ann. SNA Res. Conf., vol. 55:25-29. 2010.

R. Contreras and Ruter, J. M., “New Callicarpa species with breeding potential”, Proc. 52nd Ann. SNA Res. Conf., vol. 52:327-329. 2007.

R. Contreras and Ranney, T. G., “New opportunities for breeding allopolyploid azaleodendrons”, Proc. 49th Ann. SNA Res. Conf., vol. 49:552-554. 2004.

K. S. lattier and Contreras, R., “Non-targeted mutagenesis of Galtonia candicans Decne. through exposure to ethyl methanesulfonate”, Combined Proceedings of the International Plant Propagators' Society 65. 2015.

R. Contreras, “Ornamental Plant Breeding at Oregon State University”, Combined Proceedings of the International Plant Propagators' Society 63. 2014.

R. Contreras and Ruter, J. M., “Preliminary efforts to induce polyploidy in Cryptomeria japonica.”, Proc. 53rd Ann. SNA Res. Conf., vol. 53:159-161. 2008.

R. Contreras, Friddle, M. W., and Lattier, J. D., “Relative fertility and ploidy levels of selected rose of sharon cultivars”, Proc. 58th Ann. SNA Res. Conf., vol. 58:232-236. 2013.

R. Contreras, Ranney, T. G., Tallury, S. P., and Milla-Lewis, S. R., “Using molecular markers to investigate parentage of azaleodendron hybrids.”, Proc. 50th Ann. SNA Res. Conf., vol. 50:632-635. 2005.

R. Contreras, Velez, J., and Golembiewsk, R., “Are Learning Styles, Study Habits, and Performance Correlated in Woody Plant Identification Students?”, HortTechnology, 2013.

R. Contreras and McAninch, G., “Back from the ban: new Buddleja cultivars receive exemption under ODA amendment”, Digger, pp. 33-36, 2013.

R. Contreras, “Bred for success”, Digger, pp. 41-45, 2011.

R. Contreras and Horn, M., “Breeding to improve garden performance of Penstemon in the Willamette Valley: early stages”, Bulletin of the American Pestemon Society, vol. 73, pp. 68-72, 2014.

R. Contreras, “Bridging the gap: A new partnership between Oregon State University and LPDC designed to continue cultivar development.”, Landscape Plant News, 2010.

R. Contreras and Ruter, J. M., “Callicarpa evaluation and breeding at The University of Georgia Tifton Campus”, Landscape Plant News, vol. 20(2), pp. 3-5, 2009.

J. J. Rothleutner and Contreras, R., “Celebrating Cotoneaster”, Digger, pp. 33-36, 2012.

R. Contreras, Ruter, J., Owen, J. S., and Hoegh, A., “Chlorophyll, Carotenoid, and Visual Color Rating of Japanese-cedar Grown in the Southeastern United States”, HORTSCIENCE , vol. 48, no. 12, 2013.

J. A. Schulze, Contreras, R., and Scagel, C. F., “Comparing Vegetative Propagation of Two ‘Schipkaensis’ Common Cherrylaurel Ploidy Levels”, HortTechnology, vol. 27, no. 1, pp. 69 - 72, 2017.

R. Contreras, Ruter, J. M., Conner, J., Zeng, Y., and Ozias-Akins, P., “Confirmation of hybridity using GISH and determination of 18S rDNA copy number using FISH in interspecific F ₁ hybrids of Tecoma (Bignoniaceae)”, Genome, vol. 55, no. 6, pp. 437 - 445, 2012.

B. M. Schwartz, Harris-Schultz, K. R., Contreras, R., and Hans, C. S., “Creation of artificial triploid and tetraploid centipedegrass using colchicine and breeding”, Intl. Turfgrass Soc. Res. J., 2013.