Thanks Monica, that looks more likely, to be honest they were cheap growbags. Next year I'm going to buy better quality deeper growbags. At least it shouldn't spread to the rest of the crop.

Thanks everyone for the warm welcome and the responses, it is just affecting one plant in a greenhouse of 10+ tomatoes, I water from the bottom, they are in growbags within compost filled cut off pots. The leaves are turning dark green rather than brown or black and no evidence of pests. I have been...

Hi, This is my first year growing in a greenhouse (infact my first post too) and I have a range of plants in the greenhouse. One of my tomato plants has grown about a foot taller than all the others and at the top the leaves are curling. What is this, should I pinch out the top main shoot? Thanks in...