If squeezing the critters causes discomfort, drop them into a
bucket of soapy water.
I spread out my plants. Rather than putting all my potatoes in one spot, I've got some in the front, some along the
fence, some over by the well house, some up in the corner.
Should I happen to get bugs in a patch of plants, the distance slows or prevents them from jumping to the next group. I might lose a group, but the other groups have a chance. I do this with all the crops, not just the potatoes.