Efficacy of native Bt toxins Cry2Ab, Cry1Ab, Cry1Ac and genetically modified Bt toxins Cry1AbMod, and Cry1AcMod against a resistant strain (BX-R) and a susceptible strain (APHIS-S) of pink bollworm.

aSlope of the concentration-mortality line with its standard error in parentheses
bConcentration killing 50% with 95% fiducial limits in parentheses, in µg toxin per ml diet.
cResistance ratio, the LC50 for a strain divided by the LC50 for APHIS-S for the same toxin.
dSurvival at 10 µg toxin per ml diet adjusted for control mortality, n = 40 to 120 (mean = 82) larvae for each estimate.
eNot available
f90% fiducial limits, 95% fiducial limits not available