Hello Bob
My tomato plants are curling up and dying now also because of the 95 degree heat.
They still have a lot of tomatoes on the plants but will not grow anymore.
I don't know how hot it gets in Ohio but you might try shade cloth to cool them down and see if that helps.
White flies are a big problem too here in Florida. I use pyritheran to to keep them under control but never completely eliminate them.
Ron
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