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Performance of Seed Treatments Applied on Bt and Non-Bt Maize Against Fall Armyworm (Lepidoptera: Noctuidae)
- Source :
- Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual), Universidade de São Paulo (USP), instacron:USP
- Publication Year :
- 2020
- Publisher :
- Oxford University Press (OUP), 2020.
-
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.
- Subjects :
- 0106 biological sciences
Bacillus thuringiensis
Spodoptera
medicine.disease_cause
Zea mays
01 natural sciences
Insecticide Resistance
Hemolysin Proteins
chemistry.chemical_compound
Bacterial Proteins
Imidacloprid
parasitic diseases
Infestation
medicine
Animals
Ecology, Evolution, Behavior and Systematics
Hybrid
Genetically modified maize
Ecology
biology
food and beverages
Plants, Genetically Modified
biology.organism_classification
Endotoxins
SEMENTES
010602 entomology
Horticulture
chemistry
Larva
Insect Science
Seed treatment
Seeds
Noctuidae
Fall armyworm
PEST analysis
Brazil
010606 plant biology & botany
Subjects
Details
- ISSN :
- 19382936 and 0046225X
- Volume :
- 49
- Database :
- OpenAIRE
- Journal :
- Environmental Entomology
- Accession number :
- edsair.doi.dedup.....f5fded4098cb72904af2c29bec85cb3c
- Full Text :
- https://doi.org/10.1093/ee/nvaa088