Laboratory Determination of Oreganophosphorous Insecticide Resistance in Three Species of Tetranychus on Cotton1

Abstract

Two species of spider mites, T. atlanticus and T. pacificus, suspected of resistance to treatment with organophosphorous compounds were collected from field cotton and reared in the laboratory. Subsequent laboratory evaluation indicated that both species were resistant to parathion and somewhat less resistant to Trithion. Neither species showed marked resistance to Kelthane or Aramite. A third species, T. cinnabarinus, in preliminary laboratory tests also showed resistance to parathion.