BigBill said:Because it is the end of the season. They love warmth and sunshine. The days are getting shorter. Sunlight is not as intense. Temperatures are dropping. This is a completely normal occurrence.
NMoasis said:Samman, give your plants more fertilizer. If you have a balanced liquid, use it every 7-10 days from now until the end of the season. Your plants' roots have completely filled the pots by now and are basically surviving on the water you're providing. What sized pots, 4-5 gal?
Don't worry about lower/older leaves turning yellow.
There is a virus that causes purple leaves that I've read about but I don't know how widespread it is. You can read this article and google more info, but I think your plants just need a shot of nutrients to get them to the finish line.
How did everything else do this year?
BigBill said:Eggplants are not fall plants. They are full sun, warm weather plants.
I got fruit on them in the past by early July. They never produced a lot of fruit for months and months. I was growing them on Long Island just south of you.
It sounds to me that you might not be getting enough sun and warmth for the tomato's and eggplant. I always found 6 hours of full sun, minimum, is what they love.
gardenfish said:If it's septoria, that's pretty easy to control. You can use copper on it.