Have My Tomatoes Got A Serious Disease?

Question

There are white blotches on some of the leaves of my greenhouse grown tomatoes. The plants are in grobags and otherwise look healthy, are flowering well and the first fruit is visible today. I live in SE Scotland.

Answer 1

This article should help:
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-leaves-turn-white.htm