Studies on the residual activity of three synthetic pyrethroids cypermethrin, fenvalerate and permethrin against cotton stainers, Dysdercus spp (Hemiptera: pyrrhocoridae)

Abstract

Studies conducted using laboratory and field bioassays showed that Cypermethrin (b=−1.691) had a significantly (P 0.05) different from each other. It was also shown by these studies that the effective interval between applications was 21 days for Cypermethrin and 14 days when fenvalerate and permethrin were applied. This finding has important practical implications in the adoption of an integrated approach aimed at minimizing damage to cotton by D. nigrofasciatus.