The project aims are: * Construction of additional cages to isolate field-collected strains of A. gossypii. * Establishment of additional base-line data. * Generation of monitoring data against endosulfan bifenthrin, esfenvalerate, deltamethrin pirimicarb, dimethoate and profenofos for field-collected strains of A. gossypii using a discriminating-dose technique * To conduct full log-dose assays on strains that do not show 100% mortality at the discriminating-dose to give resistance levels.