Looks like somehting's been eating the leaves to me - aphids maybe?
Anyway I wouldn't worry about it - it's just nature doing its thing. May just happen for a week or so as part of spring insect babies or something. BUT - I don't know what I'm talking about.
All I know is that I just let my veggies/whatever go, and whatever happens to 'em happens. I did have a slug issue one year with them destroying my tomatoes, but I still had lots of good tomatoes. I guess what I'm trying ot say is plants have a way of providing enough food for everyone. You'll get your hops, and this insect or whatever will get its food from the leaves.