If they’ve been getting ample air flow around their leaves, fungi seems unlikely. Nevertheless, look up septoria leaf spot and see if it matches what you’re seeing. If you happened to use old soil that had been in contact with tomatoes in the past, it could’ve brought diseases with it.
If they’ve been getting ample air flow around their leaves, fungi seems unlikely. Nevertheless, look up septoria leaf spot and see if it matches what you’re seeing. If you happened to use old soil that had been in contact with tomatoes in the past, it could’ve brought diseases with it.