Environmental Entomology (2020) 49, 1137-1144

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Dionei S. Muraro, Regis F. Stacke, Gisele E. Cossa, Daniela N. Godoy, Cínthia G. Garlet, Ivair Valmorbida, Matthew E. O'Neal and Oderlei Bernardi (2020)
Performance of seed treatments applied on Bt and non-Bt maize against fall armyworm (Lepidoptera: Noctuidae)
Environmental Entomology 49 (5), 1137-1144
Abstract: Fall armyworm (FAW), Spodoptera frugiperda (J. E. Smith), is the main pest of maize in Brazil, attacking plants from emergence to reproductive stages. Here, we conducted studies to evaluate the efficacy of two seed treatments (chlorantraniliprole alone and imidacloprid combined with thiodicarb) on Bt and non-Bt maize in laboratory bioassays with distinct FAW strains that are susceptible, selected for resistance to Bt-maize single (Cry1F) or pyramided (Cry1A.105 + Cry2Ab2) events and F1 hybrids of the selected and susceptible strains (heterozygotes), and in the field against a natural infestation. In the laboratory, leaf-discs from seed treated Bt-maize plants at 7 d after emergence (DAE) increased the mortality of FAW resistant, heterozygote, and susceptible strains up to 24.8%, when compared with the respective maize grown without a seed treatment. In the field against natural infestations of FAW, Bt maize with a seed treatment had ~30% less FAW damage than non-Bt maize with the same seed treatment at 7 and 14 DAE. No differences in FAW damage was observed between Bt and non-Bt maize grown with and without a seed treatment at 21 DAE. Maize seeds treated with chlorantraniliprole alone or imidacloprid and thiodicarb combined presented limited protection against early infestations of FAW strains under laboratory and field studies.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Matthew E. O'Neal, Oderlei Bernardi

Research topic(s) for pests/diseases/weeds:
control - general
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
application technology

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Spodoptera frugiperda Maize/corn (Zea mays)
Bacillus thuringiensis Cry1A-toxin (entomopathogen) Spodoptera frugiperda Maize/corn (Zea mays)
Bacillus thuringiensis Cry1F-toxin (entomopathogen) Spodoptera frugiperda Maize/corn (Zea mays)
Bacillus thuringiensis Cry2A-toxin (entomopathogen) Spodoptera frugiperda Maize/corn (Zea mays)