Beginner Gardening: I need help identifying a Tomato leaf condition., 0 by Ignoramus

Ignoramus wrote:
This year I thought I would use an organic slow-release fertilizer to boost my plants and because I thought it would be more goof resistant then other types of fertilizer. When I first started using the organic fertilizer on my tomatoes ( using tomato-tone) and flowers (using flower tone) the fertilizer seemed to help however now the plants seem to be dying. The leaves are turning yellow with brown or white spots. It seems to look different on different types of plants but have very similar characteristics. I can’t see any parasites (bugs) and treated some of the plants for parasites (bugs); Yet there was no noticeable difference on the control group that I used insecticides on; so that seems to rule out parasites (bugs). I am somewhat skeptical that it’s a virus or bacterium because it has affected a wide variety of plants (tomato plants, Cardinal vines, marigolds, impatiens). Celebrity tomatoes seem largely unaffected; yet my supersweet 100 tomatoes are in dire straits and liable to be a loss for the rest of the year. Several of the marigolds have completely died, while some seem fairly unscathed.

I’ve watered nearly every day and on hot days often twice a day. The weather this summer has been rather unusual in that it hardly ever got above 90°F. For the most part it was an unusually cool and wet summer in this area (Cincinnati, Ohio).

I’m wondering if the tomato-tone and flower-tone might be the problem? Perhaps I’m over fertilizing or need phosphorus and/or potassium?

I’ve tried using sulfur dust on a control group of supersweet 100 cherry tomatoes but they seem to show no signs of improvement.

The tomato plants have practically stopped growing and for the most part aren’t producing any new flowers; yet most of the tomato fruit seems to be healthy and continues to ripen. It’s near the end of the growing season here anyway to make much difference; but I would like to learn so that perhaps I can stop this from happening again next year.

I’m poor and can’t afford a decent digital camera so I just picked a few leaves and put them on my scanner, one up and one down.

Any help would be appreciated. Thanks.