Efficacy of Bt toxins Cry1AbMod, Cry1Ac and Cry2Ab singly and in combinations against a resistant strain (BX-R) of pink bollworm (see Methods for details).

aAll mortality values are adjusted for control mortality.bObserved mortalitycExpected mortality for combinations of two or three toxinsdObserved mortality - expected mortality; synergism causes positive values and antagonism causes negative valueseProbability that the difference between observed and expected mortality occurred by chance based on Fisher’s exact test