I agree with @Pete.8. Wet and humid conditions make it more likely, so don't water them until they really need it, and if you have a cover on them remove that too. Many people have this problem because they leave lids on too long after germination too.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
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They're too young to be sprayed and it's not necessary.
Allow more air around your seedlings and the fungus will vanish.
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
Wet and humid conditions make it more likely, so don't water them until they really need it, and if you have a cover on them remove that too. Many people have this problem because they leave lids on too long after germination too.
I live in west central Scotland - not where that photo is...