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August 14, 2025 20 mins

Brian Sieber, district manager of Davey's Cincinnati office, talks about different growths that could be harming your trees, such as black knot and galls. 

In this episode we cover: 

  • Black knot (1:02)
    • Pruning infected trees (3:08)
    • How to avoid black knot (4:08)
    • Are healthy trees resistant to pathogens and pests? (5:09)
    • Does cutting out black knot save the tree? (5:47)
    • Black knot in the fall (6:39)
    • How has the weather affected Cincinnati's season? (7:09)
  • Galls (8:56)
    • How to know of galls are harming your tree (10:26) 
    • Send pictures of your tree to your arborist (11:28)
    • Pay close attention to your tree (12:55)
  • Cool native species for forested areas (14:58)
    • Hackberry tree (15:00)
    • Kentucky coffee tree (16:05)
    • Catalpa tree (17:25)
      • Catalpa worms (19:12)

To find your local Davey office, check out our find a local office page to search by zip code.

To read our blogs to learn about the different kinds of growths that can harm your trees, click here - Tree Care Tips, News & Checklists | Davey Tree Service Blog 

Connect with Davey Tree on social media:
Twitter: @DaveyTree
Facebook: @DaveyTree
Instagram: @daveytree
YouTube: The Davey Tree Expert Company
LinkedIn: The Davey Tree Expert Company 

Connect with Doug Oster at www.dougoster.com

Have topics you'd like us to cover on the podcast? Email us at podcasts@davey.com. We want to hear from you!

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