Need help identifying spots on basil
I've been noticing that some of my container plants are dying (chiefly basil, but also parsley and an early jalapeno plant), apparently from spots on the leaves. The spots are clear, grey, and brown, and in the worse cases, the top and bottom of the leaf are covered in black and white specks, some of which I also see in the soil. Eventually, the leaves fall off. The disease seems to be spreading from container to container.
See the attached link (an imageshack picture of a diseased plant).
I see some small insects buzzing around my plants, which I believe are fungus gnats (?), but I'm not sure if they can cause this. Any help is greatly appreciated.
Here is a link that might be useful: