How do you trellis beans?

I made a tripod shape and attached with poles inbetween. Then placed smaller sticks along the pole because the beans tend to spread out. Also you could use binder twine if you have it. It may not look pretty, but it works.
Also on the beans it might be flea beetles. They eat several garden plants. Seven or Eight dust works for this. I hope this helps.

I use dawn dish soap dilluted in a spray bottle to spray the leaves. Works wonders, as far as a trellis I just plant them on my chain link fence.

The best, easiest and cheapest way is to plant your bean seed with a couple of corn seed. Even if you don't want the corn, it makes a great trellis for beans to grow up on. My family has been doing this for hundreds of years. Our heirloom bean seed are cornfield beans, and they grow wonderfully up the corn stalks.

We use chicken wire to let the beans run on. Also, we use dawn dish soap and water to spray the entire garden (approx. 1 acre), this keeps all of the bugs off and is safe. Put dish soap in a garden sprayer that hooks to water hose.

Try using Seven dust and sprinkle over garden vegetable plants. This keeps bugs away, but you have to do it often especially after a rain.

The easiest way is to take three or four wooden sticks or poles about 3-4" long and about 1" wide. Put the poles in a circle around 1 or 2 bean plants, gather them together at the top and tie a piece of sturdy string or plastic around them all. You will now have what looks like a mini teepee. The beans will grow and climb the trellis. Hope this helps.