Performance of experimental Bt MON events alone and pyramided with MON810 were evaluated over three years in Georgia and Alabama. Ability of events to prevent whorl defoliation by the fall armyworm and natural ear feeding damage by the corn earworm was assessed. In each year near-isogenic hybrids with novel single transformation events and crosses pyramided with the MON810 event were compared to the standard single MON810 event and non-transformed susceptible control. All Bt events tested reduced fall armyworm whorl damage ratings per plant as compared to the susceptible hybrid. All Bt treatments also had considerably less ear infestation and damage by corn earworm compared to the non-transgenic isoline. The MON841, MON849, MON851 events reduced ear damage by H. zea but were not as effective as other novel events and were not advanced for further testing after the 1999 season. Pyramiding events as compared to single events did not improve control of fall armyworm whorl damage, but generally did prevent more ear damage by corn earworm. The MON84006 event singly and pyramided with MON810 had superior control of whorl-stage damage by S. frugiperda and ear damage by H. zea as compared to MON810.
Species 1: Lepidoptera Noctuidae Spodoptera frugiperda (Fall armyworm)
Species 2: Lepidoptera Noctuidae Helicoverpa zea (Corn earworm)
Keywords: Bt corn, Plant resistance
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