First post to these forums, and first time gardener. I apologize if this is a stupid question, I am learning as I go here and I haven't been able to find anything online to match this. Maybe I am not looking in the right place. Anyway, my basil, which has been pretty good this summer, has broken out in rust colored spots on all of the old leaves, after the last cut back. Here are some pictures:
I appreciate in advance any help in figuring out what I have been doing wrong. In case it is needed, I am in Illinois, it has been pretty cool and wet, the basil is potted in miracle grow moisture control potting mix.
Thanks in advance,