I have had some of the same issues-my seedlings did great until just recently some of them are srarting to spot and some look chewed on
I know that fertilizing seedlings when too young can damage or kill the plants, so I mixed organic potting mix with equal parts organic topsoil and some peat moss and perlite. I avoided buying kinds containing fertilizer. since it can be difficult to distinguish between fungi, bacteria, insect infestation (my eyes aren't too good anymore) I chose to treat with Neem oil. you can get it many places (lowes,home depot) and isn't expensive. Dilute 0.5 Tbsp per qt H2O and spray on plants.
Neem is made from vegetable matter
I hope this helps
I have had some of the same issues-my seedlings did great until just recently some of them are srarting to spot and some look chewed on
I know that fertilizing seedlings when too young can damage or kill the plants, so I mixed organic potting mix with equal parts organic topsoil and some peat moss and perlite. I avoided buying kinds containing fertilizer. since it can be difficult to distinguish between fungi, bacteria, insect infestation (my eyes aren't too good anymore) I chose to treat with Neem oil. you can get it many places (lowes,home depot) and isn't expensive. Dilute 0.5 Tbsp per qt H2O and spray on plants.
Neem is made from vegetable matter
I hope this helps