Ryan Hill

Ryan Hill
Agronomy & Weed Sciences Advisor

Peer-reviewed publications:

Davy, J., Hill, R.J., & Forero, L. (2025). Herbicide Applications in California Dryland Perennial Grasses Improve Forage Yield and Crop Coverage. Rangeland Ecology & Management, 103, 78-82. https://doi.org/10.1016/j.rama.2025.07.009

Hill, R.J., Nackley, L., Moretti, M.L. (2025). Mustard Seed Meal and Mulches for Weed Control in Greenhouses. Journal of Environmental Horticulture, 43(1), 41-48. http://doi.org/10.24266/0738-2898-43.1.41 

Hill, R.J. & Moretti, M.L. (2024) Herbicide Formulation Affects Weed Control and Crop Tolerance in Greenhouse Ornamentals. HortScience, 56(11), 1629-1633 http://doi.org/10.21273/HORTSCI18159-24 

Hill, R. J., King, D. R., & Moretti, M. L. (2024). Evaluating tiafenacil and tolpyralate for weed control and basal foliage removal in hops. Crop Science, 64(6), 3541-3551. https://doi.org/10.1002/csc2.21322 

Hill, R.J., King, D.R., Moretti, M.L. (2023). The prevention of injury to hazelnut trunks. Acta Horticulturae. 1379, 499-502.  

Hill, R.J., King, D.R., Zollinger, R., Moretti, M.L. (2021). 1-Naphthaleneacetic Acid (NAA) Reduces Sucker Growth in European Hazelnut (Corylus avellana L.). HortScience, 56, 1594–1598. https://doi.org/10.21273/HORTSCI16176-21 

Hill, R. J., Baldassi, C., Snelling, J. W., Vining, K. J., and Mehlenbacher, S. A. (2021). Fine mapping of the locus controlling self-incompatibility in European hazelnut. Tree Genet. Genomes 17:6.

ASST COOP EXT ADVISOR
Weed management in orchards and forage crops.
M.S. Horticulture / Plant breeding and genetics, Oregon State University. 2020
B.S. Biology, George Fox University. 2014
rjahill@ucanr.edu
Primary Image
Pollinator habitat coverage in response to herbicide treatments
Article

Weed control during pollinator habitat establishment.

May 20, 2024
By Ryan Hill
Introduction: Pollinator insects are essential to produce many economically and nutritionally important crops grown in the western USA. These crops include blueberries, almonds, sunflowers, cucurbits, and many others.
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Primary Image
Figure 3: External (top photo) and internal (bottom photo) injury was measured in unshielded and painted hazelnut trunks, showing a reduction of injury in painted trunks. The trees pictured were sprayed with 224 fluid ounces per acre of glufosinate (4x the legal label rate).
Article

Protecting hazelnut trunks from herbicide injury

January 29, 2023
Sucker control in Oregon hazelnut orchards is a season-long struggle against the tree's natural growth habit. Hazelnut trees grow naturally as a multi-stemmed bush, but in Oregon, hazelnuts are trained as a single-trunk tree to facilitate mechanical maintenance, harvest, and reduce pathogens.
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Ryan Hill

Source URL: https://innovate.ucanr.edu/people/ryan-hill