A Virus, or Too Much Heat and Water?
I'm still a newbie when it comes to tomatoes - so help is appreciated! Two of my tomato plants (Anna Russian, Speckled Roman) have curled their leaves - and now I see it's starting on two of my other plants (Amish Paste, Oaxacan Jewel). It starts at the top of the plant and works it's way down.
After searching, it looks like this could be due to the excess heat (we've been in the upper 80s all week, and in the upper 90s the last 2 days) and rain (lots of it!), or it could be a virus?
How can I tell the difference?
I'm posting a picture, with a pink backdrop to make the image clearer.