How long have you had the tree?

How often do you feed it and with what?

Is it exposed to extrem temps?

How long has it been in that pot?

A pic was a good start:-)

MIke

I got it at Christmas 2012. It isn't exposed to extreme temperatures. I transplanted it last spring from the put it came in. Gave it one feeding. The bag of fertilizer said to use it every three months.

Dr earth organic citrus fertalizer

Just looks like salt burn from a build-up of salts from your fertilizer combined with a heavy slow draining potting mix.

I am not a container guy; but some here will give you better advice. BTW your tree looks fine... don't stress... few leaves are perfect.

Also I notice some webbish type stuff on some of the leaves. It doesn't come off with scrubbing. Any idea as to what that is?