I feel the heat you speak of, I'm up a ways from you in Valencia...Looks like sunscald. The leaves are probably curling due to the heat stress. My tomatoes do the exact same thing when its blazing hot (or way over watered). If you're worried that it might be mites, take a leaf inside and flick it over white paper...Look for dots about this size (.) moving or slightly smaller. Got movement? You got mites. But seriously, the sun has been brutal this week. Think about erecting a canopy of shade cloth. I use 60-75% for my tomatoes and the ones out side of the canopy are wrecked. Careful with the sulfur, it can easily burn your leaves. I've had great luck with Neem applied at night, soaking dripping wet. I notched up the application frequency a little from the instructions and annihilated some thrips and mites. The fact that leaves are dropping really points to sunscald/heat stress. If mobile, I'd reduce their direct sun exposure period until things start to cool down a bit. Remember, fried leaves never come back so watch the new growth. And putting them out of direct sunlight for a week or so wont kill them, just give them bright sky.
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Also, its been so hot and dry lately, I wouldn't worry too much about blight.
