Knowledgebase

Growth on Locust Tree #879796

Asked August 01, 2024, 4:58 PM EDT

Hello, I just noticed this on one of my locust trees (see atachment). Would you please let me know what it is and if my tree needs "medical" attention? Thank you!

Boulder County Colorado

Expert Response

Good Morning Roygina,
Thank you for your question. This is something that our Diagnostic team will want to look at before we can send you in the right direction. Honeylocust are notorious for fungal disease such as canker which will develop different types of lesions on leaves, stems and trunks. Injuries or fresh cuts also pose problems as entry points for pest too. Here is a fact sheet to give you some information about disease and management for Honeylocust.


Honeylocust Diseases - 2.939 - Extension (colostate.edu)


But, I will make sure our Diagnostic team gets back to you.

Best,
Lisa
CSU ext. Master Gardeners
An Ask Extension Expert Replied August 05, 2024, 11:41 AM EDT
Thank you so much!
Gina Hyatt
<personal data hidden>
 
On 08/05/2024 9:41 AM MDT Ask Extension <<personal data hidden>> wrote:
 
 
The Question Asker Replied August 05, 2024, 2:30 PM EDT
Hello Gina,

Thank you for you question. The Master Gardener forwarded it for diagnostics.

After looking at the photo, it's consistent to "tree conk", which is essentially a mushroom.

Here is additional information that you may find useful:
 
University of California IPM "Wood Decay Fungi and Landscape Trees"

https://ipm.ucanr.edu/home-and-landscape-trees/pest-notes/#gsc.tab=0

Regards,
Colorado Master Gardener
CSU Extension Boulder County
An Ask Extension Expert Replied August 06, 2024, 11:14 AM EDT
You offfer a very special service! Thank you so much for this information.
Gina Hyatt
 
On 08/06/2024 9:14 AM MDT Ask Extension <<personal data hidden>> wrote:
 
 
The Question Asker Replied August 06, 2024, 3:29 PM EDT

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