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Premature Leaf Drop in Ash (Fraxinus)

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From: James Klodz
Arlington Heights, IL
The tree is losing it's leaves now . Has been for the last two weeks. Is it the ash borer or could it be something else/ If so what can I do to preserve this tree?

Extension Message
From: Jay Hayek
Extension Specialist, Forestry
Department of Natural Resources and Environmental Sciences
Hi James:

The U of I plant clinic has received numerous phone calls from homeowners regarding premature leaf drop in ash (Fraxinus spp.).

We don’t know what is causing the premature leaf drop, however, stress induced by last year’s drought and scorching summer heat are certainly factors. Additional factors worth considering are emerald ash borer, verticillium wilt, and other environmental stressors.

Here are your top three options:

1. Ensure your yard trees receive supplemental water during periods of drought

2. Submit a specimen sample to the U of I Plant Clinic for analysis/culture:

3. Contact a certified arborist for an on-site inspection of the tree.

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