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Dahle, Gregory

Associate Professor of Arboriculture & Urban Forestry

Greg Dahle teaches undergraduate and graduate courses in arboriculture and urban forest management. Dr. Dahle’s research utilizes tree biomechanics to understand how urban trees grow and survive environmental loads such as those from snow and ice storms. This research is investigating the likelihood of tree failure in residential and commercial settings as well as utility rights-of-ways. He has worked as an arborist managing commercial and municipal tree care accounts in the San Francisco Bay Area and served as a consulting utility arborist. He holds a doctorate from Rutgers University, and a Masters and Bachelors of Science from Purdue University. He is an International Society of Arboriculture Board-Certified Master Arborist  and a qualified Tree Risk Assessor.


  1. Walker M, G Dahle. 2023. Literature review of unmanned aerial systems and lidar with application to distribution utility vegetation management. Arboriculture & Urban Forestry 49:144-156.
  2. Dahle GA, RT Eckenrode, ET Smiley, D DeVallance, I Hálasková. 2022. Can mechanical strain and aspect ratio be used to determine codominance in in red maple unions without included bark? Forests 13, 1007. 13 pp.
  3. Eckenrode RT, GA Dahle, ET Smiley, D DeVallance, I. Cynk-Dahle, M. Walker. 2022. Examining strain propagation in the lateral branch attachment of white oak (Quercus alba L.) and chestnut oak (Quercus prinus L.). Urban Forestry & Urban Greening 73: 1-7. 127591.
  4. Walker M, GA Dahle. 2022. Likelihood of failure of trees along electrical utility rights-of-ways: a literature review. Arboriculture & Urban Forestry 48:242–257.
  5. Beezley, KE, GA Dahle, J Miesbauer, D DeVallance. 2020. Determination of Strain Patterns Across the Root-Stem Transition Zone in Urban Trees. Arboriculture & Urban Forestry 46:321–332.
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