Biological Activity of Two Mexican Nucleopolyhedrovirus Isolates and Sublethal Infection Effects on Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae)

The biological activity of 2 isolates of Spodoptera frugiperda multiple nucleopolyhedrovirus (Sf-YUC and Sf-CHI) obtained from the states of Yucatán and Chiapas, Mexico, on second instar fall armyworm, Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) from Michoacán State, Mexico, was det...

Full description

Saved in:
Bibliographic Details
Published in:The Florida entomologist 2022-09, Vol.105 (3), p.179-184
Main Authors: Martínez-Castillo, Ana Mabel, Zamora-Avilés, Norma, Camargo, Angélica Hernández, Figueroa-De la Rosa, José Isaac, Pineda, Samuel, Ramos-Ortiz, Selene
Format: Article
Language:English
Subjects:
Army-worms
baculovirus
Baculoviruses
Biological control
Control
Corn
Diseases and pests
efectos subletales
Environmental aspects
fall armyworm
gusano cogollero
Health aspects
Host-virus relationships
persistencia de viral
Pests
Physiological aspects
RESEARCH PAPERS
sublethal effects
virus persistence
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The biological activity of 2 isolates of Spodoptera frugiperda multiple nucleopolyhedrovirus (Sf-YUC and Sf-CHI) obtained from the states of Yucatán and Chiapas, Mexico, on second instar fall armyworm, Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) from Michoacán State, Mexico, was determined and compared with that of a Nicaraguan isolate (Sf-NIC). Response of third and fourth instar S. frugiperda to the most active isolate, Sf-YUC, also was determined. Sublethal effects caused by this isolate and its intergenerational persistence were evaluated. The most pathogenic isolates on second instar S. frugiperda were Sf-NIC and Sf-YUC. No significant differences were detected in the speed of kill between the Sf-NIC (146 h) and Sf-YUC (149 h) isolates, whereas that of the Sf-CHI (158 h) isolate was slower significantly. The lethal concentration that kills 50% of the insects (LC50) values of the Sf-YUC isolate increased with larval stage from 9.45 × 104 to 1.25 × 106 occlusion bodies per mL. Statistically significant reductions in pupal weight, fecundity, fertility, and adult longevity were associated in individuals derived from third instar (generation F0) treated with 4.8 × 104 occlusion bodies per mL of the Sf-YUC isolate. A viral mortality of 15.83 ± 1.43% in larvae as well as a significant reduction in pupal weight of generation F1 was recorded. In conclusion, the Mexican isolates may prove suitable as the basis for biological insecticides for regional control of S. frugiperda. Sublethal infections that persist between generations could incur developmental costs and decrease reproductive capacity of the host insect. En el presente estudio, se determinó la actividad biológica de dos aislados mexicanos del nucleopolyhedrovirus múltiple de Spodoptera frugiperda (Sf-YUC y Sf-CHI) sobre larvas de segundo instar del gusano cogollero, Spodptera frugiperda (J. E. Smith), y se compararon con un aislado nicaragüense (Sf-NIC). También se determinó la respuesta de tercer y cuarto instar de S. frugiperda al aislado mexicano más activo, Sf-YUC. Finalmente, se evaluaron los efectos subletales causados por este aislado y su persistencia intrageneracional. Los aislados más patogénicos sobre el segundo instar de S. frugiperda fueron Sf-NIC y Sf-YUC. No se detectaron diferencias significativas en la velocidad de muerte entre los aislados Sf-NIC (146 h) y Sf-YUC (149 h), mientras que la del aislado Sf-CHI (158 h) fue significativamente mayor. Los valores de la conce
ISSN:0015-4040
1938-5102
DOI:10.1653/024.105.0301