On Wed, 12 May 2021 20:48:39 +0100, squidfest
wrote:


Hi
My tomato plant seedlings (photos attached) have gone from good and
healthy to developing muddy brown coloured leaves. I am pretty sure it's
not over watering. I have other plants that were started at the same
time and kept in same environment and are good and healthy. It would be
good to have some kind of answer so hoping all of you knowledge and
expertise can help.
Thank you all


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Sunscald ? just an uneducated guess

https://backgarden.org/tomato-sunscald/

John T.