I believe huggorm is correct - Platanus, not Acer, and with the evidence of sycamore anthracnose that is so common to that species in dry climates.

Thank you huggorm and gardengal48! You both appear to be right - it definitely looks more like a sycamore, and with the anthracnose fungus as gardengal48 suggested.

Some quick googling makes this sound like a disease that will require ongoing treatment and maintenance in the form of systemic fungicides. Will fungicide treatment followed by good sanitation be sufficient or will fungicide need to be re-applied each year? I read that it is safe to compost the affected leaves - is that really true?

Does it seem like would it be better to just scrap the little guy and replace him with something tougher while it's still young, or is it worth it to keep up with the maintenance?

Also, should I move this question over to the general "trees" thread now that I know I chose the wrong forum?

Thank you!

Do you have space for a sycamore? They grow enormous. If not, you should replace it with something smaller.

How are you going to treat it when it gets large?

I'd dump it. They're not good looking trees in my opinion, especially if you have to treat them. I know you would appreciate the shade, but there are other, better looking trees that would fit the bill.

Mike

No need to move your post - we maple people are general tree people as well:-) We just like maples a lot!

And the answer to your question is pretty simple. The anthracnose will be an ongoing problem if conditions exist for its development and regular, at least annual, treatments will be required to control it. It is seldom a fatal affliction but it can cause defoliation and that can weaken the tree, leading to other issues. Plus, a tree with anthracnose always looks pretty funky and unhealthy.

The pathogen that causes sycamore anthracnose is unique to that species so composting the diseased leaves should not pose any problems unless lots of other sycamores in the vicinity and the composting process not very thorough.

Although a diseased sycamore will not grow as fast or as large as a perfectly healthy tree, they can get quite large and maybe not the best choice for a suburban garden. I'd look into replacing the tree with something that will be more attuned to your specific climate and location, like a native Texas species or something like a Shantung maple, Acer truncatum, which is very well adapted to a TX planting situation.

I'd dump it. They're not good looking trees in my opinion, especially
if you have to treat them. I know you would appreciate the shade, but
there are other, better looking trees that would fit the bill.

Mike

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Only this species or all platanus? I'm not familiar with p. occidentalis but I like the London planetree a lot.

Only that tree in that location.

I'm not familiar with any of the London Plane trees and, or, Sycamores at all. They're out of scale for the average residential garden, no Fall color, and giant leaves, plus they're prone to be sick in a lot of areas. That's a lot not to like about them. I have 10 acres and wouldn't even consider having one.

I guess they looked OK in Dallas and Paris when I was there though.

Mike

Thank you everyone! Your input has been invaluable, I really didn't even know where to begin trying to figure out what was going on with that little guy before your help! It's been decided - the sycamore must go.