College of Agricultural Sciences

R. Contreras, Ruter, J., and Schwartz, B. M., “Oryzalin-induced Tetraploidy in Cryptomeria japonica (Cupressaceae)”, HortScience, vol. 45, no. 2, 2010.

R. Contreras, Ruter, J., and Hanna, W., “An Oryzalin-induced Autoallooctoploid of Hibiscus acetosella ‘Panama Red’”, Journal of American Horticultural Science, vol. 134, no. 5, 2009.

R. Contreras and Friddle, M. W., “‘Oregon Snowflake’ Flowering Currant”, HORTSCIENCE , vol. 50, no. 3, 2015.

R. Contreras and Ranney, T. G., “New opportunities for breeding fragrant rhododendrons”, Journal of American Rhododendron Society, vol. 62, no. 4, 2008.

R. Contreras, Ranney, T. G., Milla-Lewis, S. R., and Yencho, G. C., “Investigating parentage and hybridity of three azaleodendrons using AFLP analysis”, HortSCience, vol. 42, no. 3, 2007.

J. D. Lattier and Contreras, R., “Intraspecific, Interspecific, and Interseries Cross-compatibility in Lilac”, Journal of the American Society for Horticultural Science, vol. 142, no. 4, pp. 279 - 288, 2017.

J. A. Schulze and Contreras, R., “In Vivo Chromosome Doubling of Prunus lusitanica and Preliminary Morphological Observations”, HortScience, vol. 52, no. 3, pp. 332 - 337, 2017.

J. A. Schulze, Lattier, J. D., and Contreras, R., “In vitro germination of immature Prunus lusitanica seed”, HortScience, vol. 52, no. 8, 2017.

R. Contreras and Meneghelli, L., “In Vitro Chromosome Doubling of Prunus laurocerasus ‘Otto Luyken’ and ‘Schipkaensis’”, HortScience, vol. 51, no. 12, pp. 1463 - 1466, 2016.

R. Contreras and Lattier, J. D., “Improving a garden classic.”, Digger, pp. 47-50, 2014.

J. D. Lattier, Chen, H., and Contreras, R., “Improved Method of Enzyme Digestion for Root Tip Cytology”, HortScience, vol. 52, no. 7, pp. 1029 - 1032, 2017.

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

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.

R. Contreras, Ruter, J., and Knauft, D., “Flower, fruit, and petiole color of american beautyberry (Callicarpa americana L.) are controlled by a single gene with three alleles”, HortScience, vol. 49, no. 4, pp. 422-424, 2014.

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

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 Ruter, J. M., “Evaluation of Callicarpa spp. for utilization in a breeding program”, Georgia Green Industry Association Journal, pp. 32-33, 2008.

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 and Owen, J. S., “The Economy of Water”, Digger, pp. 139-144, 2011.

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.

R. Contreras, Determann, R., and Friddle, M. W., “Differences in Winter Browning among Japanese-cedar Cultivars Are Not Due to Variation in Ploidy Levels”, HortScience, vol. 46, no. 11, 2011.

R. Contreras and Ruter, J. M., “Developing an evergreen, evergreen: Winter browning in Japanese cedar”, Amer. Conifer Soc. Quarterly J., vol. 27(1), pp. 19-23, 2010.

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, 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.

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.