New tree with apple scab
(sorry for the long back story, if you want to skip to the question it is in the final paragrph)
This spring I bought two new apple trees on a semi-whim. Semi because I've been wanting to get started with fruit trees for a long time now, but whim because they were there, I was there and I bought them knowing that the reassurances I was getting that they were appropriate to this region might just be stretching things a little. I'm beginning to think of them as my sacrificial trees, here for me to learn from, but likely to be deceased before too long. One's a Fuji and one's a Gala.
So they are in the middle of a field, with the nearest other Malus about 1/3 of a mile away. They were breaking dormancy when I got them, and I did spray them once with a copper solution for cedar apple rust, but only once since we then went through a real long spell with no rain. Lately I noticed some dark growth on the leaves and then on the solo fruit set that I think is apple scab. One of the trees is horribly infested, like almost every leaf. Reading on scab says that it comes from last year's leaf litter, mainly.
So my question is did those trees come with this disease from the nursery? Or is it somewhere in my local environment at such a high pressure that it could cause such a bad infection so fast?