This is a Henry Lauder Walking Stick Tree with problems.........
Is this rust? Is it fungal? I have had a problem in the oaks close by with Anthracnose the past two years, a fungal disease. Daconil was suggested by an arborist in early spring, however said it was not necessary, oak trees would be fine just disfigured leaves, and the four trees are huge.
Any suggestions on how or what to treat with. It's not getting as much sun as it used to get.
Thanks,
Chuck
This is a leaf scorch and can be caused by a few things. 1 - Cultural - Simply lack of water. This is the one I hope you have. 2 - Bacterial leaf scorch - this is caused by bacteria that have clogged up the plumbing system, and will kill the tree, or 3 - Cotton root rot. And it too is fatal.
Cotton root rot (aka Texas root rot) is a fungus that kills plants in more or less circular spots, ranging from a few yards to an acre or more. It depends on how far the fungus in the soil reaches. Symptoms are sudden wilting with the dried leaves clinging to the plant, and death. It is most common on heavy alkaline soils. http://bexar-tx.tamu.edu/HomeHort/F1Column/2004Articles/AUG15.htm http://www.plantanswers.com/garden_column/aug04/4.htm http://www.ci.austin.tx.us/growgreen/rootrot.htm http://ag.arizona.edu/gardening/news/articles/14.2.html
Bacterial leaf scorch has the same symptoms of cultural leaf scorch (lack of water) and it can take the tree a while to die. It is the same bacteria that causes Pierce's disease in grapes. http://images.google.com/imgres?imgurl=http://agnewsarchive.tamu.edu/dailynews/stories/HORT/photos/May2507a-hr.jpg&imgrefurl=http://agnewsarchive.tamu.edu/dailynews/stories/HORT/photos/May2507a.htm&usg=__7MKLKfl3P0uTLzBRjR3rJ0uqBao=&h=1200&w=1600&sz=299&hl=en&start=45&sig2=8JA2Al5gfmBbIaXa8LXlJw&um=1&tbnid=PjmhMDZKg34rPM:&tbnh=113&tbnw=150&prev=/images%3Fq%3Dbacterial%2Bleaf%2Bscorch%2Btamu%26ndsp%3D20%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DN%26start%3D40%26um%3D1&ei=0SCHSsbTNZSMtAPilaylBw
You can either wait and see, giving the tree the water it needs (we are in a drought here - is it the same in McKinney?) or take a sample in to your local Extension Office, or contact Texas A&M's diagnostic lab and work with them directly.
Hoping it is just lack of watering, and hoping that the drought hasn't done it in...
CJ
Thank you for the very concise info. You must be a good hort. person.........
With pretty good assurance, I might be able to rule out a lack of water. We have not been in a drought, but this spot may be water deficient. Will follow through and check into the other two problems.
I'm thinking it might be one of the other two problems, as this is the second year it has been affected like this. Last year was minor compared to this year though.
Chuck
That sounds like bacterial leaf scorch then. Cotton root rot usually kills pretty fast...
Good luck.
CJ
