What's big, black and white, and not a pest? « TreeTopics

7 Destructive Tree Pests You Should Look out for in Summer - Dave Lund Tree Service and Forestry Co Ltd.

Lepidoptera, Bugging You From San Juan Island

Common Ontario Tree Pests Great Northern Regreenery

Threats to Trees: Insects – City of Toronto

Green Alder Sawfly – A New Invasive « TreeTopics

Common Tree Pests Found In Ontario - Five Star Tree Services

7 Ways Wildlife Supports Healthy Trees & Forests - One Tree Planted

This Exotic Insect Pest Invading New York Trees! Have You Seen It

PDF) Sasajiscymnus (=Pseudoscymnus) tsugae: A ladybeetle from Japan

What are these black and white dots? : r/plantclinic

15 Astounding Facts About Trees