Tree Diseases & Pests

Good bugs or bad bugs, what’s eating your dogwoods? Helpful identification and management information about diseases and pests that cause health issues for our trees and other plants.

Anthracnose

• Maple Anthracnose, PA DCNR website
• Anthracnose, Morris Arboretum
  

Chestnut Blight

• American Chestnut Cooperators' Foundation Homepage
  
  

Woolly Adelgid

• Hemlock Woolly Adelgid, Morris Arboretum
• What is the Woolly Adelgid?, PA DCNR
• What can landowners do about Hemlock Woolly Adelgid?, PA DCNR
• Hemlock Woolly Adelgid- Integrated Pest Management
  

Elongate Hemlock Scale

• Hemlock elongate scale, Morris Arboretum
  

Oak diseases

• Oak leaf galls
• Oak twig galls - Morris Arboretum
• Rusts - Morris Arboretum
• Tulip tree scale - Morris Arboretum