Get rid of them quick if you can. They reproduce quickly and will overwhelm the plants. I did not have much luck getting rid of them when they got my butternut squash the other year but there were already hundreds of them when I discovered them. Look closely at the base of the plants.
The eggs really stick to the leaves and can't be easily squished so rip off the portion of the leaf with the eggs and get rid of it. They will also hide under boards on the ground and you can lift the board and kill them.
They can get out of hand very quickly. I garden organically and I don't use some of the chemical sprays available but I have heard that they are resistant to a lot of things. Good luck.
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