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Old 08-03-2013, 11:41 AM
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RigglePLC RigglePLC is online now
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Join Date: Jul 2006
Location: Grand Rapids MI
Posts: 10,954
Be sure to take a look at information on herbicide injury and the diagnosis of same. Many links and photos, such as:

I am not sure there is a good chemical test to determine if it was herbicide injury--if there is, and the herbicide has not been metabolized and broken down--I suspect any test would be very expensive.

And the most important disease on smoke tree:
Verticillium wilt. Symptoms are fairly close. See also notes about how it is intolerant of poor drainage and high temperature of the roots. And dangers of mulch piled around the trunk.

Last edited by RigglePLC; 08-03-2013 at 11:50 AM. Reason: added
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