Phytotoxic Reaction to Tree-äge?

[Alex]

Has anyone experienced leaf drop with brown spots on leaves, just days after treating ash trees with Tree-äge? I need to go look at these trees, but got a call tonight from the client describing these symptoms. I've never seen this before with other ash trees I've treated. I rechecked my rates/trunk diameter (medium rate)and everything was correct. The trees were relatively healthy, no sign of woodpecker activity yet or branch die-back; a little sparse but not very. We've had moderate to plentiful rains this spring and some chilly nights late in spring, but things are warming up now in Michigan. Could this be ash anthracnose, ash yellows, ash plant bug, or another condition that just happens to be coinciding with the Tree-äge application? I've just never seen this on other trees treated exactly the same way.
Thanks,
Alex

 

[nuthin_special]

Sounds like anthracnose to me. Rains combined with timing (spring) point to anthracnose. Should be unrelated to pesticides.

 

[KyLimbwalker]

We had this happen to one client. I think that it is anthracnose as well- I called Arbor-jet and they stated that there is no phytotoxicity from Tree-age.

I am doing a site visit to this client's house with our local extension agent on Tues.

Does anyone know:

1. Do all the leaves that fall have visible anthracnose spots? Or can leaves fall that appear healthy?

2. Is there a diagnostic lab test for anthracnose?

 

[treevet]

I am sure the fungus can be cultured in a lab and identified.

My guess is that leaves COULD drop without any symptoms on the leaves if the fungus is in the stem of the leaf and/or the twig.

Finding the presence of anthracnose on these leaves/stems does not preclude the possibility of phytotoxic reaction.

 

[treegazer]

I had this happen to one tree this spring out of literally hundreds. I collected and took samples to the lab. I was thinking anthracnose as well. The lab results found no evidence of anthracnose. The plant pathologist called and talked to a lot of other researchers and chemical folks and there has not been any data that suggests that Treeage is phytotoxic at the label rates.

It was suggested to me by the pathologist to collect twig and branch samples to test for Verticillium.

 

[KyLimbwalker]

I had the twigs on the leaf-drop ash tested for Verticillium. It came back negative. The tree has anthracnose and a large girdling root. Maybe a combination of factors. Since the leaf-drop, the ash has re-leafed.