Knowledgebase

Catalpa tree issue #937218

Asked June 29, 2026, 2:33 PM EDT

My catalpa tree is losing leaves like its fall. I see no bugs and it isn’t the whole tree. Any idea what might be happening? Respectfully, Carl

Washtenaw County Michigan

Expert Response

In the absence of other evidence of insects or disease, the most likely cause is Verticillium wilt. MSU Plant and Pest Diagnostics Lab can definitely diagnose the problem with appropriate samples. This information explains how to collect a good sample and current pricing: https://www.canr.msu.edu/pestid/submit-samples/wilted-trees-and-shrubs.

There are a few other diseases that could explain these symptoms. Extreme heat and drought can also cause similar symptoms, but I would expect those symptoms to be more widespread on the tree or on the side of the tree more exposed to sun and wind. 

For more information:

https://apps.extension.umn.edu/garden/diagnose/plant/deciduous/catalpa/leavesdiscolored.html

https://extension.psu.edu/catalpa-diseases

To locate a certified arborist to look at your tree: https://www.treesaregood.org/Find-an-Arborist

Thank you for contacting Ask Extension! Replied June 29, 2026, 5:43 PM EDT

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