[CANUFNET] white blotches on Norway maples

Shields, Peter Peter.Shields at davey.com
Wed Nov 21 12:25:18 EST 2012


Has anyone seen this?  I was sent a picture from multiple trees in Ottawa asking to try and ID this.  Apparently throughout the crowns randomly and spongy underneath.  Does not look like a lichen but could be wrong.  Trees are stressed too.  It's kind of fun trying to diagnose from such a small caption!

Peter Shields
Board Certified Master Arborist, ISA BCMA ON 0570B
Certified Tree Risk Assessor, ISA PNW CTRA #1590
Forest Technician
ASCA Member
Butternut Health Assessor,  OMNR BHA #252
Davey Resource Group, A Division of Davey Tree Expert Company
Cell (647) 465-4901

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