A few of my potato plants have shown up with this:
([url=https://www.lexneva.name/misc/leaf_spots_halfsize.jpg]higher resolution[/url] and [url=https://www.lexneva.name/misc/leaf_spots_fullsize.jpg]original size[/url] also available)
In case the picture doesn't make it clear, the leaf are covered in little spots, most of which are tiny holes straight through, and a few of which are only specs of brown. One plant has every leaf looking like this, and a few have a couple of good leaves but the rest speckled. Some of my potatoes aren't affected at all.
They're not like any disease spots I've seen before, because of the holes. Usually I've just seen browning and withering. They're also not much like insect damage I've seen before, but I suppose little insects could bore holes right through like this.
What do you folks think? Insects or disease? I kind of hope it's insects... I feel like I have half a chance to combat that, and potatoes are so hardy they can probably just shrug it off. Disease, on the other hand... that could wipe out my whole crop
Maybe it's something else entirely, like inadequate fertilization or incorrect pH?
Oh, one more thing -- it's been incredibly rainy here for the past week or two.