Possible disease?

[clkingtx]

I have been having a lot of yellowing leaves, and such. I am doing a kiddie pool garden(except for the micromultifloras in pots, which have the problem the worst), which requires the plants stay wetter than usual, but the growth and production has been great(except for some of the micromultis, which aren't setting fruit as well, but might dry out a touch too much between waterings) I have probably around 40 plants total, and it is sporadic, and generally on lower leaves. I put fertilizer and lime in soil mix at planting time(1-2 months ago), and fertilized with a complete fertilizer(mittleider weekly feed) a couple of weeks ago. The majority of the plants are setting fruit pretty heavily, and still flowering and growing well. Our weather has been weird so far this year, wet and rainy for a week or so, then 1-3 good dry sunny days, then more rain. It has been dry for about 2 days now, and today is nice and sunny. The kiddie pool gardens hold about an inch or two of water, and drains all excess. Here are some pictures of the diseased leaves, and a couple to show the overall condition of the foliage. I am of course removing any foliage that yellows, or spots, etc. I am thinking it might be time to start fungus treatment and prevention...