Septoria? and Late Blight?
Two of my tomato plants seem to have some progressive disease issues. When I first noticed it and snapped pictures, I was told that it was likely just heat damage from the hot spell we were having (100+). I removed all the leaves then, and temps have been more moderate since, but I still have newly damaged leaves. The two most affected plants are the Roma and the Black from tula, but the disease look very different on both.
These are from the Roma, as you can see from the first photo, the damage is mostly on the bottom of the plant, involves lots of yellowing of the leaves, some necrotic circles, and some leaves eventually wither entirely:
These below are from my potato-leaf "Black from Tula" which is in the adjacent raised bed, about 5 feet away. It has no yellowing as far as I can see, and the fruits and stems look completely strong and healthy. I didnt search every inch, but I didnt find any discoloration on the stems.
I wasnt able to capture it well in the photos, but the brown/grey areas on the BfT are almost irradescent in the light.
And there's also this gem, found on the back of one of the leaves of an otherwise healthy looking plant:
Heaven help me! Ideas what is going on with the plants? After staring at a number of online diagnostic sites, the Roma looks like it has Septoria combined with maybe Late Blight, maybe heat damage. The BfT looks like late blight, but is there another possibility? Could it be heat damage? Per the recommendation of these forums, I've gone entirely with soaker hose irrigation so the leaves dont get wet (except from rain) combined with straw mulch to keep the roots cool and balance out the moisture.