A ridge or bank made or set aside on cultivated land (and often sown with perennial grasses) to provide a suitable habitat for insects (especially aphid-eating beetles) and other creatures which prey on crop pests.
Origin
1990s.
Definition of beetle bank in US English:
beetle bank
noun
A ridge or bank made or set aside on cultivated land (and often sown with perennial grasses) to provide a suitable habitat for insects (especially aphid-eating beetles) and other creatures which prey on crop pests.