I am not sure whether or not the Romas are more suseptable to sun scald than other tomatoes.
Sun scald on fruits and stems frequently occurs when you do one or two procedures together :
1)if you prune suckers (unproductive vegetative growth) off tomato plants; this makes for easier fruit picking, but at the expense of the plant shadeing itself
Also , when you prune the suckers , it forces more of the plants energy into fruit production and earlier ripeness.
2)if you water plants in bright sunlight; the droplets remain on the stem or leaves, and act as magnifiers of sunlight causeing sun scald.
Sun scald generally occurs when there is high humidity, very bright sunlight, and a slow evaporation of water droplets.
Some people water vegetable gardens very early in the morning, but best policy is to water at night to increase water transmisson to encourage deeper roots,
and to minmize water evaporation .
Hubby reported today that he has had no further trouble since he put on the bonemeal and epshome salts that I gave him to apply to the soil. He cut off all the affected plants.
Some of them were discolored even on the bottom, so that’s why I was leaning towards blossum end rot, instead of sun damage.