Good to know you have identified the culprits then. What caught my eye was not only your first pic, with those brown leaves, but the pic under that showing the plant at soil level--you can barely see them but the hairy fuzzy stuff right near the stems on the left look like the mites. Like I said, they are very hard to detect on these smaller-leaved plants. On my basil, they are not apparent but once I get the lighter discoloration that spreads to other leaves, then I know. This year I had about 40 seedlings and they have not thrived and are dying very slow deaths. If you grow beans and see the mite damage, then you will recognize it in your herbs. Bean leaves are thin and tender like herb leaves. Thought this year after the winter rains, the mites might not come back but I was wrong. I am hoping that after a few years they will disappear, just like the flea beatles did. But then something worse might come along.
