Need help identifying foliar diseases

[DogsandDirt]

Several plants (hybrids, ironically) started to develop yellowing on some of the lower leaves. I can't decide if this is Septoria, Early Blight, or none of the above. I also have a Black Krim with large areas on the lower leaves that start out as a dried out area, then the leaf turns dry and crispy. It starts at the most distal leaf from the stem and works it's way towards the stem. The branch then just falls off. Had the same problem last year and never figured out what it is. Sprayed with Actinovate/Exel LG (3 tsp/gallon) last Thursday, and Serenade on Sunday. I can't take another year like last year.

The first 2 pictures are of the Superfantastic. A Better Boy also has this yellowing. Third picture if of the Black Krim leaves.