I guess it could have been your green aphids, but I usually associate that type of damage with mites, of which there are several species. Some mite species are so small as to be barely visible, and operate on the underside of leaves. For some reason, mite damage seems not to result in curling of the leaves.

Not that it makes much difference from a practical standpoint. Your insecticidal soap should also be effective on mites, as would many insecticides and even summer oils.

Mites will also attack many decorative plant species. Last summer, a single boxwood in a row at my son's place appeared to be dying, while all the others were fine. We sprayed with permethrin, the damage stopped, and the boxwood resumed healthy growth. I am pretty sure the cause was mites so small we couldn't even see them.

Don Yellman, Great Falls, VA

Calistoga-
I think Don is right in my particular case (as he ususally is)... if you still think it's a fungus, can you give me more specifics? Thanks,
-Glenn

I suggest it's water stress in a young tree -- probably not yet rooted in well.

Apply the majority of water to the area of the original root ball because that area dries out faster than the surrounding soil.

Yep, it did.

Hate to disagree with you since you are so often right, but not this particular time. Glenn's own photo of mite damage is of the top surface of the leaf; the photo in the link is the underside. You would have to turn that leaf over to get the best match to his damage.

Around here, on those rare occasions when a fruit tree can't find sufficient moisture in the soil, entire leaves shrivel beginning at the margins. They do not selectively develop brown spots in some areas while the rest of the leaf appears normal.

It's been hot in Virginia too, but the rains have been regular enough that I haven't had to water anything so far, even the blueberries or the vegetable gardens. Rhode Island has received at least as much rain. We have a lot of problems growing fruit here in the east, but it's usually not like the west coast where the rains shut down entirely in summer.

Don Yellman, Great Falls, VA

And, this is just classic heat/dry damage/water stress, correct?

Are these all just simple water stress?

Thanks,
-Glenn