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Jun 12, 2015 10:26 AM CST
Thread OP
Name: Catherine
SW Louisiana (Zone 9a)
can anyone recommend a treatment ? our tree is about 10 years old and is the centerpiece of our front entrance. Hasn't been fertilized; organic mulch, no pruning this year. We're just sick about this
Jun 12, 2015 12:09 PM CST
Name: Sue
Ontario, Canada (Zone 4b)
Annuals Native Plants and Wildflowers Keeps Horses Dog Lover Daylilies Region: Canadian
Butterflies Birds Enjoys or suffers cold winters Garden Sages Plant Identifier
Last year I saw what may be verticillium wilt on a young Japanese tree lilac. I cut out the wilted branches and this year it is still alive although still a bit sparse on one side.

A couple of articles that may be useful:
"The severity of disease development will depend on the strain of the pathogen, the level of susceptibility in the host, and environmental factors. Landscape trees with recent wilt symptoms should not be removed immediately. They may "recover" and perform fairly well with some environmental manipulation. In general, the most resistant plants are those grown in moderately fertile soil in which the balance of major nutrients is tipped slightly toward high potassium and low nitrogen. Generously watered plants are often invaded less extensively than those under moderate to severe water stress."

Also this one:
Jun 12, 2015 6:59 PM CST
Thread OP
Name: Catherine
SW Louisiana (Zone 9a)

Thanks Sue - just what we needed. The second article included a list of alternative trees although we'll wait til late summer to be sure.

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