Around here, the best way to deal with a bamboo infestation is with a backhoe.
Bamboo is big grass. It spreads via seeds and roots. It all needs to be ripped out.
When I lived in Africa, we'd have bamboo forests, with trunks up to about a two-foot diameter (and about six inches apart). Completely impassable.
Great place for small critters to escape big predators.