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

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