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Wednesday - June 07, 2006
From: Coppell, TX
Region: Southwest
Topic: Diseases and Disorders
Title: Diagnosis of problems with Texas ash
Answered by: Joe Marcus and Dean Garrett
QUESTION:
Our 15 year old Texas ash has less leaf production this year. It also has a small amount of algae on the trunk, and some of the branches have small white spots on it. Also, a few of the branches closest to the trunk have died. Any suggestion would be appreciated.ANSWER:
Possibilities:Fusicoccum Canker could cause branches to die and might be responsible for the white spots on the branches.
If by “algae” on the trunk you mean a fungus, a fungal rot like Varnish Fungus Rot or Sulfur Fungus Rot could be responsible; they can also cause limb death.
There are several foliar diseases of ashes that might have caused leaf loss, anthracnose being only the most common. It, however, has many symptoms that don't seem to match yours, based on your description.
This list of ash pests with diagnostic descriptions can help you match your symptoms with known ash diseases and get ideas about how to control them, and this discussion of White Ash contains an informative section toward the end about common diseases of that tree. Texas Ash (Fraxinus texana) is so closely related to White Ash (Fraxinus americana) that many taxonomists consider it to be just a variant of White Ash, so any information you find about White Ash will probably apply to your Texas Ash.
You might consider having your tree diagnosed by the Texas Plant Disease Diagnostic Laboratory. You can contact your county office of the Texas Cooperative Extension to determine how to send a sample. Having an arborist look at your tree is another idea.
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