isa prep 2026

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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