Utah State University Extension
Predatory insects can provide natural pest control by eating unwanted pests. This beneficial service is known as biological control. Predatory insects are one factor that maintains pest populations at non-damaging levels. By conserving and encouraging predatory insect populations, plants can be protected from pest attack and excessive damage.
Ramirez, Ricardo and Patterson, Ron, "Beneficial True Bugs: Damsel Bugs" (2011). All Current Publications. Paper 860.