An elevated, uncultivated earth ridge running through an arable field, sown with native bunch grasses and perennials. It serves as an overwintering habitat for ground beetles, spiders, and other predatory invertebrates that will migrate into the adjacent crop rows in spring to eat aphids and pests.
Heard on the job
We plowed in a new beetle bank across the fifty-acre wheat field to help keep the aphid numbers down next season.