My tomato plants were doing great till a few days ago. Suddenly they started getting these white patches on the leaves, especially the leaves at the top and new leaves at the bottom. Some leaves, especially older ones towards the bottom started shrivelling and drying up completely and the plants will not support themselves any more.
They are on a window sill (I was about to start hardening them off) and I have had a few plants out of the pots to check for anything eating the roots and I didnt find anything. They have been potted on a few times already and after checking the roots I see they are not too big for the pots just yet.
From the white patches on the leaves I suspect a magnesium deficiency but some of the plants dont have the same problem. I cant find any evidence of any fungal or pest problems. I have been watering from the bottom a very small amount every day and the potting mix is just moist enough. Its a mix of around 60% coco coir, 30-35% compost and 5-10% perlite.
They are Minibell cherry tomatoes. They are in a window that gets the sun from 1 or 2pm till 8 or 9pm when we have sun. Its a bit up and down here at the moment in the UK. Any ideas? The white spots are more severe than the pictures show, it was hard to capture them in the pictures.
https://i.ibb.co/DDq718K/72-E537-B6-8-DF7-4967-9374-04-BD5-B0-DE932.jpg https://i.ibb.co/PhscgNz/394205-D2-D6-A6-4-EFB-B97-B-2-BA425-DB87-C4.jpg https://i.ibb.co/2KJ0DDP/4-AB9-F1-B0-9153-43-BC-925-B-BF7-ADA69-ECF7.jpg https://i.ibb.co/qpXRMkS/F4246-E8-C-B352-4-DD5-9879-1-A0-B092612-F8.jpg