frost damage on potatoes

Here we see the telltale signs of the effects of frost on potato leaves.
Not life threatening, but enough to retard the growth of the new shoots that will eventually pump starch into the tubers down below.
The answer is to cover the potatoes. We have been able to do this with our early potatoes but we have too many second early and maincrop to cover.
I am hoping that the last of the late frosts is soon.