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Q&A – What are the bumps on this oak tree branch?

Question:
What are the bumps on this oak tree branch?

Answer:
These red bumps are Endothia Cankers which is a fungus. These cankers can be found on dead branches, branches that have been pruned improperly, or branches that have been shaded out. It is an indicator that the tree is in poor health. The best way to treat it is to cut off the affected branch.

Related Resources:
Key to Diseases of Oak in Landscape
Biscogniauxia (Hypoxylon) Canker and Dieback of Trees

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  • Home
  • Watch
    • TV Schedule
    • Full Episodes Online
    • How-to and Informational
    • Questions and Answers
    • This Week in the Garden
    • Garden Notes
  • Garden Topic Collections
    • Apple Trees: How-to and Information
    • Peach Trees: How-to and Information
    • Tomatoes: How-to and Information
    • Square Foot Garden Blog
  • Resources
    • Soil Testing
    • Extension Publications
    • Gardening Resources
    • Blogs
    • Organic Gardening
    • Articles
    • Privacy
  • Guests
  • Contact Us
    • Ask a Gardening Gardening Question
  • Search