Howdy, y'all.

I have 7 oblique cordoned apples that have been spoiled rotten, perhaps literally. They've been cooed over and coddled; I actually built an unheated greenhouse for my babies, to protect them from disease and keep 'em warm. And how have they repaid me? By not blossoming, and by getting weird pale yellow areas areas and then brown spots on their leaves.

The blossoming I'll deal with in another post, but in this here post I'd like to deal with the spots. (Unless you gurus think the two are related.)

I don't think they are apple scab, according to this description of scab symptoms, anyway:

"Leaf spots appear in spring as small olive-green lesions on the uppper and lower leaf surfaces. As spores form, lesions develop a velvety brown appearance. Later, lesions are more elongate and often follow veins, but the same velvety brown look is present. As leaves age, they turn yellow (except for the scab lesions) and fall from the tree."

Mine don't look start out as olive-green lesions, they don't ever look velvety brown, and the leaves don't turn yellow and fall off.

My apple trees have definitely had the brown spots before. They don't seem to be killing or stunting the trees; they are still growing vigorously. But I'm wondering if they have a mineral deficiency, or some disease, or some combination of the two? I tried applying spraying Miracle-gro solution on the leaves to try and provide a foliar feeding, but that didn't seem to help.

Thoughts, fruit sages?

I'm in Vancouver, BC, Canada.