I planted six blueberry bushes from Nourse Farms this spring. Most have some evidence of brown edges on upper leaves, although as you'll see from the pics there is spotting on one or two. Any idea what may be causing this? I've looked a lot online and can't find any reference to this particular issue.

I did a soil test before I planted and ph was high: 6.6. I had added sulfur last fall, but planted with lots of peat and more sulfur. Other soil test results were P=23, K=195, Ca=1266 and Mg=283.

I fertilized once a couple months ago with a little ammonium sulfate, but I think this problem preceded that.

Here are the pics:

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