My yard long beans are about 6 foot tall now, and a couple of the stalks are covered in dozens of tightly-packed tiny black beetles. They don't move much when I shake the stalk, but the stalk around where they are is darkening. How should I deal with these guys? I'm trying to grow organically. As a new gardener, I made a fatal mistake of planting cucumber and yard-long beans in one little patch, so everything is a bit cramped. The beans are right up against the cucumbers, which are doing very well.

Help! Any ideas? Do I need to post a picture? Thanks. Julia