Riley Johnson

Riley Johnson

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Research Assistant
Department of Horticulture


Riley Rouse is a research technician in Dr. Bert Cregg’s Tree Physiology lab. She manages a container-grown research nursery as well as in-field tree planting sites and performs research and extension efforts for the Michigan Christmas tree industry.


  • M.S., Horticulture, Michigan State University, 2020
  • B.S., Natural Resources Management, Grand Valley State University, 2017

Peer-Reviewed Publications

Cregg, B., Rouse, R., & Ellison-Smith, D. (2023). Genotypic variation in water relations and gas exchange of urban trees in Detroit, Michigan, USA. Urban Forestry & Urban Greening, 81, 127858.

Cregg, B., Ellison-Smith, D., & Rouse, R. (2023). Managing cone formation and leader growth in Fraser fir Christmas tree plantations with plant growth regulators. Forests, 14(1), 25.

Landgren, C., Cregg, B., Rouse, R., & Kowalski, J. (2022). Controlling leader growth on noble and Turkish fir with S-ABA. Forests13(2), 212.

Rouse, R. P., & Cregg, B. (2021). Species and season affect response of container-grown shade trees to pre-plant root modifications. Urban Forestry & Urban Greening, 63, 127184.