College of Agricultural Sciences

R. Contreras and Ruter, J., “Genome Size Estimates and Chromosome Numbers of Callicarpa L. (Lamiaceae)”, HortScience, vol. 46, no. 4, 2011.

J. J. Rothleutner and Contreras, R., “Genome size estimates for Cotoneaster spp.”. 2011.

R. Contreras, Ruter, J. M., Conner, J., Zeng, Y., and Ozias-Akins, P., “Interspecific hybridization in Tecoma Juss. (Bignoniaceae): Confirmation of hybridity using GISH and morphology”. 2011.

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

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.

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 Rinehart, T., “An express route to perfection”, Digger, pp. 47-50, 2012.

K. J. Vining, Contreras, R., Ranik, M., and Strauss, S. H., “Genetic methods for mitigating invasiveness of woody ornamental plants: Research needs and opportunities.”, HortScience, vol. 47, no. 9, 2012.

B. M. Schwartz, Contreras, R., Harris-Schultz, K. R., and Raymer, P. L., “Identification or Creation of a Putative Triploid Seashore Paspalum”. 2012.

T. Einhorn, Gibeaut, D., Contreras, R., and Whiting, M. David, “Polyploidy of cells in sweet cherry fruit”. 2012.

R. Contreras, “A Simple Chromosome Doubling Technique Is Effective for Three Species of Cupressaceae”, HortScience, vol. 47, no. 6, pp. 712-714, 2012.

J. J. Rothleutner and Contreras, R., “Variable Fire Blight Resistance Among 31 species of Cotoneaster”. 2012.

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, 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.

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.

B. M. Schwartz, Harris-Shultz, K. R., Contreras, R., Hans, C. S., and Jackson, S. A., “Creation of Hexaploid and Octaploid Zoysiagrass Using Colchicine and Breeding”, Crop Science, vol. 53, no. 5, p. 2218, 2013.

B. M. Schwartz, Contreras, R., Harris-Schultz, K. R., Heckart, D. L., Peake, J. B., and Raymer, P. L., “Discovery and characterization of a turf-type triploid seashore paspalum”, HortScience, vol. 48, no. 12, 2013.

C. Landgren, Owen, J. S., and Contreras, R., “Evaluating Soil and Foliar Fertilization of Abies nordmanniana Under Container and Field Production”, Scandinavian Journal of Forest Research, vol. 28, no. 52, pp. 419 - 427, 2013.

R. Contreras, Owen, J. S., Hanna, W., and Schwartz, B. M., “Evaluation of Seven Complex Pennisetum Hybrids for Container and Landscape Performance in the Pacific Northwestern United States”, HortTechnology, vol. 23, no. 4, 2013.

R. Contreras and Meneghelli, L., “In Vitro Chromosome Doubling of Prunus laurocerasus ‘Otto Luyken’”. 2013.

B. M. Schwartz, Contreras, R., and Hanna, W. W., “Manipulating the Chromosome Number of Zoysiagrass”. 2013.

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, 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.

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.