ISA Prep Course Session 4: Pruning, Diagnosis and Plant Healthcare
- Wednesday, March 18, 2026, 12:30 PM - 2:30 PM
Diagnosis and Plant Health Care
Time: 12:30 pm – 1:30 pm
Speaker: Michael Mahanna
Credentials: Mahanna has been an ISA Certified Arborist for over 30 years. He is a retired professor at Hamilton College who now teaches courses at Hamilton Arboretum.
Topics to be discussed:
- Causes of plant disorders
- Steps in diagnosis
- Diagnostic tools
- Insects and diseases
- Abiotic problems
- Treatment
Pruning
Time: 1:30 pm – 2:30 pm
Speaker: Jeanne Grace
Credentials: ISA Certified Arborist and TRAQ, Forester for City of Ithaca
Topics to be discussed:
- Pruning objectives
- How trees respond to pruning
- Defining branch collar, branch size and branch protection zone
- Procedures and techniques used in pruning
Fee
$99
Register
https://www.cognitoforms.com/CornellCooperativeExtensionOfOnondagaCounty/2026ISAPrep
Contact
Leanna Nugent
Community Forestry and Natural Resources Educator
lwn5@cornell.edu
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Last updated January 27, 2026