Any Mite's?
Reminds me of the horrors I went though with mites in 2010. Looks very similar...
Hm. Love ya, gassy, but.....
Broad mites tend to go after grown leaves, and usually eat "holes" in them. They are not true holes, which is why I used quotes. Instead, the mites eat the insides of each cell, leaving the transparent skeletal structure of the leaf mostly intact. So what's going on may well be because of mites, but unless you're also seeing these non-holes, it's probably a different kind of mite. Regardless.... KILL THEM! KILL THEM! KILL THEM!