Resistance of the sheep blowfly Lucilia cuprina to insecticides in the Republic of South Africa.

Laboratory tests on larvae of nine strains of the sheep blowfly, Lucilia cuprina, and one of the hairy blowfly, Chrysomia albiceps, taken from the field are reported. Results indicate resistance to arsenic in one strain and to diazinon in the remainder and in Chrysomia albiceps. Field evidence corroborates the presence of resistance in the blowfly maggots to current flystrike insecticides with reduced protection resulting in more frequent treatment.