Basil damage question
So this has been a good basil plant for me thus far this summer. I have made two big cutbacks on it for some pesto, and it has grown back like a champ each time. However this time I am getting these rust colored spots on all of my leaves. Brand new leaves seem to be pretty clean so far, but everything I left after my last cutback has the spots on them. The plant has been pretty bug free for me, there were some mites (spider?) at the beginning of the summer, but they were taken care of manually and with a little spray. It has been really wet here, pretty much the only thing i have so far.
Any help in figuring out the problem will be greatly appreciated. Thanks in advance.