Journal of Economic Entomology (2021) 114, 2264-2270

Marcelo R. Zakseski, José G. da Silva Filho, Matheus Rakes, Juliano de B. Pazini, Ana Paula S.A. da Rosa, Paula Marçon, Holly J.R. Popham, Oderlei Bernardi and Daniel Bernardi (2021)
Pathogenic assessment of SfMNPV-based biopesticide on Spodoptera frugiperda (Lepidoptera: Noctuidae) developing on transgenic soybean expressing Cry1Ac insecticidal protein
Journal of Economic Entomology 114 (6), 2264-2270
Abstract: Pathogenic assessment of a baculovirus-based biopesticide containing Spodoptera frugiperda multiple nucleopolyhedrovirus (SfMNPV: Baculoviridae: Alphabaculovirus) infecting fall armyworm, Spodoptera frugiperda (J. E. Smith, 1797) (Lepidoptera: Noctuidae) is reported. In the bioassays, neonates were infected with different doses of SfMNPV applied on Cry1Ac Bt soybean and non-Bt soybean. Our findings indicated that S. frugiperda neonates did not survive at 10 d post infection or develop into adults on Bt and non-Bt soybean sprayed with the field recommended dose of SfMNPV. In contrast, a proportion of the infected neonates developed into adults when infected with lower doses of SfMNPV (50%, 25%, and 10% of field dose) in both Bt and non-Bt soybean. However, S. frugiperda neonates surviving infection at the lowest virus doses on both soybean varieties showed longer neonate-to-pupa and neonate-to-adult periods, lower larval and pupal weights, reduced fecundity, and increased population suppression. Nevertheless, more pronounced pathogenicity of SfMNPV infecting neonates of S. frugiperda were verified on larvae that developed on Bt soybean. These findings revealed that, beyond mortality, the biopesticide containing SfMNPV also causes significant sublethal pathogenic effects on neonates of S. frugiperda developing on Bt and non-Bt soybean and suggested an additive effect among SfMNPV and Cry1Ac insecticidal protein expressed in Bt soybean.
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Database assignments for author(s): Holly J.R. Popham, Oderlei Bernardi

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

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Spodoptera frugiperda	Maize/corn (Zea mays)	Brazil (south)
Alphabaculovirus spofrugiperdae (entomopathogen)	Spodoptera frugiperda	Soybean (Glycine max)	Brazil (south)