So that's what those little buggers are ....
Organic ...... well you might try getting some hot peppers, grinding them up and then soaking them to get a liquid solution of hot pepper juice - a friend did this many years ago in his garden and it eliminated alot of pests.
Rotenone is organic - it's made from the roots of several different plants - it's definitely a posion though. But I believe it breaks down fairly rapidly.
Pyrethruem or Pyrethin (sp ?) is also organic I believe, but I don't know alot about it.