Since the introduction of transgenic cotton in 1996 a robust resistance management plan (RMP) has been in place which works in consort with an insecticide resistance management strategy (IRMS). A key element to the success of this strategy is that insecticidal agents that are deployed together (in stacked Bt varieties) or sequentially (in chemical rotations) are sufficiently different to make it unlikely that resistance to one insecticide will confer cross resistance to other insecticidal products.