02019naa a2200301 a 450000100080000000500110000800800410001910000190006024501740007926000090025352011470026265000210140965000110143065000160144165000140145765000140147165000130148565000240149865300110152265300160153365300120154965300090156165300150157065300150158565300190160070000240161977300740164310098852016-07-15       1989    bl uuuu     u00u1 u    #d1 aCAMPANHOLA, C.  aToxicity and synergism of insecticides against susceptible and pyrethroid-resistant third instars of the tobacco budworm (LepidopterabNoctuidae).h[electronic resource]  c1989  aToxicities of insecticides to neonate larvae of susceptible and pyrethoid-resistant strains of the tobacco budworn, Heliothis virescens, were measured using a glass liquid scintillation vial technique. Result showed that ICI neonates were resistant to all pyrethroids tested. We observed no resistance to alternate insecticides including organophosphates, carbamates, avermectin, and rotenone. Several insecticide combinations were synergistic against resistant neonates. Chlordimeform synergized almost all incecticides tested; synergism was usually greater with susceptible than with resistant neonates. In combination with chlordimeform piperonyl butoxide was more synergistic against resistant neonates. The resistance sprectrum of the ICI strain suggests that target site resistance to pyrethroids is most important in neonate larvae and that both target site and metabolic resistance were present, with target site resistance being more important. The similarity of resistance in adults and neonates confirms the validity of adult monitoring in predicting resistance in neonates, the stage at which insecticide control is usually aimed.  achemical control  acotton  aLepidoptera  aNoctuidae  asynergism  atoxicity  aHeliothis Virescens  aInsect  aInsecticide  aNeonate  aPest  aPyrethroid  aResistence  aSusceptibility1 aPLAPP JUNIOR, F. W.  tJournal of Economic Entomologygv. 82, n. 1, p. 1495-1501, dez. 1989.