Hello, I have a number of tomato plants, and I have seen an issue prominent with just 2 of my Costoluto Genovese plants.

The leaves seem to be curling upwards lengthwise. I apologize for the slightly out of focus picture, can't get my phone to do any better.

I have put them in the ground around late April.

The soil is clay, but I have amended it with about 4+ inches of mushroom compost, tilled into it. I have been pruning this plant quite a bit. It is my first attempt to grow as a single stalk up a string.

I had been watering the soil once per week for about 50 minutes with a 1 gallon per hour drip line. I have decided to split up the watering to every 3 days for 30 minutes each time. It just started getting hotter here so I Just made the change.

I am not sure if watering is the issue, but most of my other tomato plants are doing great.

From what I have read on the internet I don't believe the issue is viral, as I don't see any yellowing of the leaves nor purple veins, just curling. I increased the watering frequency about a week ago, and all the new growth at the top still shows curled leaves.

Can anyone make suggestions as to what I can do to improve the condition of the plant?

Thank you.