The oldest leaves on my tomato plants are all covered with holes - which look like they're pest related - but also with brown spots with the center falling out, which might be a blight or something? Can anyone tell me what the issue might be? The link below is to a larger more detailed photo.

Also, I'm trying to stay organic with my home garden, so it would be great to get organic / natural / creative solutions.

Thanks!

Image link:

Here is a link that might be useful: picture of problem tomato leaves