I have 3 rows of tomatoes in my 40" hoophouse. The plants are robust and making fruit, but I am experiencing a lot of mottling and curling of the lower leaves of the tomatoes in the middle row. I was watering daily for 10 minutes  a day with 2 rows of drip - thought maybe they were getting too much water, so have cut that to watering every other day. The curling is not spreading, but not sure if anything has changed. Any ideas what might be causing this?......Gail @ Whetstone Ledges