We have four tomatoe plants in the greenhouse and two of them have brown stains on their lower leaves and also some leaf curl. Is this because of the very hot temperatures we have experienced in the greenhouse this year. This is our first year with a greenhouse.
Certified GKH Gardening Expert
It is likely due to the humidity in there. Sounds like a fungal infection. I would need a photo to be sure, and to give you proper advice on a solution to the problem.