TOXICITY OF BETA-CYCLODEXTRIN COMPLEXES OF SULPROFOS AGAINST TOBACCO BUDWORM LEPIDOPTERA, NOCTUIDAE ON COTTON

Formulations of the beta-cyclodextrin (BCD) complex of sulprofos and a n EC (emulsifiable concentrate) formulation of sulprofos were compared for toxicity against the tobacco budworm (TBW), Heliothis virescens ( F.), on cotton. None of the formulations of the BCD complex of sulprof os was as efficacious as the EC formulation throughout the entire eval uation period. Formulations BCD1 and BCD3 suspended in 0.25% Airvol 20 5 solution exhibited enhanced toxicity compared to a formulation with no additives (BCD6). Addition of xanthan gum as a suspending agent at 0.8% (BCD2) improved toxicity, but not at 0.5% (BCD4). All formulation s were toxic to TBW at 0 days after treatment (DAT). Formulations BCD1 and BCD3 exhibited diminished toxicity compared to sulprofos EC at 3, 5 and 7 DAT. Formulation BCD2 was the most efficacious of the BCD for mulations of sulprofos, exhibiting significantly less control than the EC formulation only at 5 DAT when applied at 1.12 kg (AI)/ha.