tomato white leaf

[BONSCOUSE]

as a first year novice virgin greenhouse owner ie.1st time indoor tomato grower and new kid to this site could someone please advise me on why tomato plants i assume are ready to grow on in their last positions (in pots in greenhouse) have just developed white, dry areas on some of their leaves?ive seemingly been watering accordingly so i really dont know if its been too little or too much or is it some disease/blight?please help!

[FionaH]

If you could manage to post some pics of them, that would help

[Two_Sheds]

It sounds like you might have scorched them. Tell us about the gh: what's it made of, what temps is it getting up to, what ventilation or shading you're using...

Also, please pop your location into your profile, it's v. important when giving advice, as the north differs greatly from conditions in the south