Is anyone able to identify this disease / pest? We have this on several citrus of different types including an orange, grapefruit, lime, and a mandarin orange.
My first thought was that it could be snails as some of the blighted area almost looks like it has snail tracks around it. I don't see snails around the trees, but they might be attacking at night.
This is in San Jose, California.
UPDATE Aug 15, 2015: Still same problem. Doesn't seem to be killing the tree though.