What is That Black Blob on Your Trees? - Door County Pulse
Oak Galls and Mistletoe: Nature's Decorations - The Real Dirt Blog - ANR Blogs
Oak Galls and Mistletoe: Nature's Decorations - The Real Dirt Blog - ANR Blogs
What is Black Knot Fungus? How Do You Treat It? | Croft Tree Experts
Common Insects & Diseases of Aspen | Colorado State Forest Service | Colorado State University
What's wrong with my plant? : Garden : University of Minnesota Extension
Black knot | UMN Extension
The Mystery of the Black Sacs - Indiana Yard and Garden - Purdue Consumer HorticulturePurdue University Indiana Yard and Garden – Purdue Consumer Horticulture
What are those nastly little black things? - No Ordinary Homestead
Black Walnut Trees (U.S. National Park Service)
Woolly Aphids: What's That Fuzzy, Fluffy White Stuff on My Tree? - Dengarden
What are these Sticky Balls on my Fruit Tree? | Fruit Forum
Black spot disease - treating and fighting it naturally
Black Knot – Signs, Symptoms, and Treatment
Black Knot | Backyard Farmer | Nebraska
What is this ball like thing on this tree limb? There are multiple on each limb. They're not on any of the other trees nearby. : r/whatsthisplant
What are these ugly bumps on my tree's leaves? - MSU Extension
Common Insect Pests of Oak in North Carolina | NC State Extension Publications
Galls on Oak Leaves and Twigs | Horticulture and Home Pest News
A Guide to Managing Black Knot Fungus | Birch Tree Care
Those Green Balls in Our Leafless Winter Trees | Our Mississippi Home
Common Tree Fungus Types And How To Treat Them
