 The diamondback was not recognized as DDT-resistant until 1953, and broad-spectrum use of insecticides did not begin until the late 1940s.By the 1980s, resistance to pyrethroids had developed.Limiting broad spectrum insecticide use and particularly elimination of pyrethroid use, can increase survival and propagation of diamondback parasitoids, "Microplitis plutellae", "Diadegma insulare", and "Diadromus subtilicornis".