| geographical and temporal variability in susceptibility to cry1f toxin from bacillus thuringiensis in spodoptera frugiperda (lepidoptera: noctuidae) populations in brazil. | the genetically modified maize tc1507 event with the cry1f gene (cry1f maize) has been used to control spodoptera frugiperda (j.e. smith) (lepidoptera: noctuidae) in brazil since the 2009-2010 cropping season. as part of the insect resistance management program, we conducted studies to determine the baseline susceptibility to cry1f before the widespread planting of cry1f maize. subsequently, we evaluated the geographical and temporal variability of susceptibility to this toxin in populations of ... | 2014 | 26470084 |