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Forestry Staff

[photo, Forestry crewman working up in a tree]
Marvin Pettway Campus Forester 763-5539 Marvin Pettway (get address) (38.103.63.61)
Jane Immonen Forestry Assistant 763-5539 Jane Immonen (get address) (38.103.63.61)

Forestry Crew

Our Forestry Crew is responsible for the trimming, inspection, fertilizing, water and disease prevention of the trees on campus. We also remove and plant new trees as necessary. All of the information about these trees is stored in our Tree Inventory Database.

This crew is made up of Art Grissom, Jane Immonen, Bob Harrison, Rob Miller, Mike Rutkofske, and Mike Stoker.

Here is the number of trees we maintain on campus:

  Zone 1Zone 2Zone 3 Zone 4Zone 5Zone 6
Ornamental440354 420383428229
Shade Trees504436 468471563468
Evergreen236127 262323486600

Regular Services Provided

 [Image, Tree Leaf Graphic]

The Tree Crew provides all of the following services:

  • Trim, prune and remove diseased or hazardous trees.
  • Fertilize, water and mulch trees.
  • Performs elm tree injection.
  • Performs cabling, cavity filling as needed.
  • Sprays to control insects, pests and diseases, as needed.
  • Coordinates Integrated Pest Management program.
  • Manages yard waste composting site for leaves, wood waste and other plant materials.

About Campus Trees

The University campus, located in Ann Arbor- the "city of trees"- is home to over 7,000 trees. The Central Campus area also known as the "Original Forty" Acres is the area bordered by South University, State, North University and Church Streets. The Original 40 is home to 1,022 trees. The most prevalent shade tree genus is maple (Acer) that comprises 13% of the area population. The most prevalent ornamental tree genus is crabapple (malus) that comprises 10%. There are 286 evergreen trees in the Original Forty in the five genera fir (Abies) , hemlock (Tsuga) , spruce (Picea) , pine (Pinus) and douglasfir (pseudotsuga). The most unusual genus in the Original Forty is Carolina silverbell (Halesia carolina). We have two of these on the north side of the Hatcher Graduate Library. According to Michael Dirr, this tree is native from West Virginia to Florida and eastern Oklahoma, on wooded slopes and along streambanks.

The North Campus area also known as the "Engineering Core" is the area bordered by Bonnisteel Blvd., Murfin, Hayward, and Beal Streets. It is home to 949 trees. The area has smaller, newer trees compared to the "Original Forty", a small naturalized wooded area, and a higher percentage of evergreens (35% to 28%). The most prevalent tree genus is pine (Pinus) that comprises 25% of the area's tree population and the most prevalent ornamental tree genus is crabapple (Malus) that comprises 16% of the population.

Regarding species management, the Office of Landscape Architecture and the Grounds Department have the goal of using predominantly native species in this area and having no more than 10% of any one species in the area.

Concerned about the Ash Borer? See our Emerald Ash Borer Action Plan.

Donating Trees to the University

For information about donating or dedicating a tree on the University campus, contact the University Planner's Office at 764-2455 or write to Sue Gott, University Planner.

Student Opportunities with Trees & Forestry [image, foresters working]

If you are interested in applying for a job, apply on-line now!

If you are interested in other opportunities in Grounds check out Groundskeeping, Horticulture and Turf Crew.



Last modified: February 2004

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