Barbara said:

Hi
I have a 5 year old apple tree, (there are about 20 apples on it right now)
At first glance I thought it was suffering from rust, but a closer look
revealed rust-colored spots on the leaves where something has punctured the
leaf right through the center and there are "bristles" (legs?) on the
undersides of the leaves. What is this and what can I do to get rid of it?
The fruit is untouched. If there is a place to post picture I will.

Cedar-apple rust is possible:
"In late spring or early summer, clusters of small orange-yellow, tubular fruiting
bodies (aecia) project downward from these lower surface spots."

Any junipers in the area with strange growths?

http://fhpr8.srs.fs.fed.us/idotis/di.../cedarapp.html

http://www.ca.uky.edu/agc/pubs/ppa/ppa23/ppa23.htm
--
Pat in Plymouth MI ('someplace.net' is comcast)

Any technology distinguishable from magic is insufficiently advanced.
(attributed to Don Marti)