They're infected with anthracnose. The only practical control is to keep the leaves raked and bagged before each rain, since rainfall is the primary way of spreading the disease. [BTW, those actually are London Plane trees: a hybrid between Oriental & American Sycamore.] More here: http://www.na.fs.fed.us/spfo/pubs/fidls/anthracnose_east/

Thanks for the answer. Makes me feel better. I added the question and response to the Question and Answer database as well: http://seeclickfix.com/new-haven/questions/27-What-can-be-done-about-the-london-plain-trees-losing-their-leaves-and-dying

Thank you, Tree Hugger! I guess we can close this issue.

A lot of rain led to a lot of growth very rapidly. Then the rain stopped. The trees needed more water to support all that new growth. They can drop leaves to adjust. Also, London Plane trees are susceptible to anthracnose but are resistant to it enough that leaves are lost but it does not kill the tree. It may kill off branches over time. Nothing can be done. Let nature take its course.

Hey Pam,
I am concerned about this too. They have never lost their leaves this early. Maybe URI can help.

Do you have photos? Do you know what type of tree these are?

The traffic has gotten worse on Orange St. but I don't know what it's attributed to. Perhaps a sign here
might help.

I think I would have the police check it first in case it's boobie-trapped.

We will take a look!

Hi,
Do you have a photo?

Closing as documented and as its no longer Winter. Please open a new issue if this starts again next Winter.

These have been removed I believe.

I believe this has been resolved given that its spring.