50 years ago, the need to combat flesh-eating screwworms led scientists to produce flies on a mass scale.
Fly factory planned for Mexico — Science News, June 2, 1973 A “fly factory” is scheduled to be built in southern Mexico to produce 300 million living flies each week to help eradicate screwworm, which is a major livestock pest. Screwworms feed on living host animals through open wounds or sores. The fly factory will …