Doubt it's a virus. More likely physiological leaf curl.

What have your temps bee, both day and night.

Further, what size pot is that. Looks rather small.

Thanks for the feedback.

I'm curious why you doubt it's a virus. I'm not eager for my plant to have one, mind you, and it would be great if it were true, but what lead you to that doubt? Note that the leaves are curled upward here, and the entire plant is leggy/tangly.

The temps have been uncharacteristically low, and relatively windy for mid-summer preceding and during this condition (around 75 with significant winds for the past two weeks). In fact, the plant was thriving the most during the 90 degree days and I've been hoping for a return to see if that would help.

The pot is fairly big. It was recommended by the nursery for tomato plants, probably 15-20 gallons.

You asked "I'm curious why you doubt it's a virus."

At this time, not the typical appearance for virus. More likely physiological leaf roll in response to low temps

Hey, I appreciate the insight. It turns out however, this is a case of Curly Top Virus. a wide consensus between local growers was reached based on these pictures and others, and my own intuition leading me to the http://www.cdfa.ca.gov website since the problem never resolved. Our property and those nearby have had a high concentration of Beet Leafhoppers for years.

Apparently, this isn't only common in the area, but without row cover it's a near inevitability. Now I know.

The hardest part is its inability to ever recover. The good news is, as everyone knows, tomato plants grow quickly, so I should be back up and running with some Brandywines quickly.

Wouldnt the new plants get the virus too? is it soil or plant issue here?

@behlgarden, If we left the new plants unattended they would for sure succumb to this awful disease. We've made a 6' x 12' box cage out of pvc pipe and tied row cover to all sides of it to accommodate our new plants.

Technically it's a 'summer insect barrier' type of row cover allowing air, mositure and 90% light in, but no bugs, or birds.

Thanks for the feedback. So we all learn something new.

How do your plants look now? If they've changed, would you please post more images?

@jean001a, We're starting over with seeds, so as soon as they hit the 2 week mark I'll put them into the row cover cage and be sure to post update photos.