Lethal and sublethal effects of chlorantraniliprole on Spodoptera cosmioides (Lepidoptera: Noctuidae)

LUTZ, ALEJANDRA L; BERTOLACCINI, ISABEL; SCOTTA, ROBERTO R; CURIS, MARÍA C; FAVARO, MARÍA A; FERNANDEZ, LAURA N; SÁNCHEZ, DANIEL E

PEST MANAGEMENT SCIENCE

JOHN WILEY & SONS LTD

Año: 2018

1526-498X

BACKGROUND: Spodoptera cosmioides (Walker, 1858) population has increased in Btsoybean crops in Argentina. As there are no registered products for its control, therecommended insecticides for S. frugiperda are used. The aim of this study was therefore todetermine the lethal concentration (LC) and sublethal effects of chlorantraniliprole on thebiological and reproductive functions of S. cosmioides, an emerging soybean pest inArgentina.RESULTS: An ingestion toxicity bioassay showed that chlorantraniliprole was activeagainst larvae of the second instar, and after 48 h exposure LC50 was 0.054 μg/ml H2O. Inthe study of sublethal effect, chlorantraniliprole induced changes in the life cycle ofexposed S. cosmioides, which required more time to complete all stages of development(larval, pupal and adult stages). Pupal weight was also higher in larvae exposed to sublethalconcentrations of chlorantraniliprole. Adult fecundity was decreased: the number of eggslaid by each adult female moth, as compared to control females, was two (LC15) and eight(LC30) times smaller.CONCLUSION: These results indicate that chlorantraniliprole has toxicity against S.cosmioides larvae. Sublethal effects on the biological and reproductive performance of thisspecies can help optimize integrated pest management programs.