Insecticidal efficacy and possibility of Combretum trifoliatum Vent . ( Myrtales: Combretaceae ) extracts in controlling Spodoptera frugiperda ( J.E. Smith ) ( Lepidoptera: Noctuidae ) - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Pest Management Science Year : 2023

Insecticidal efficacy and possibility of Combretum trifoliatum Vent . ( Myrtales: Combretaceae ) extracts in controlling Spodoptera frugiperda ( J.E. Smith ) ( Lepidoptera: Noctuidae )

Abstract

BACKGROUND The fall armyworm Spodoptera frugiperda (J.E. Smith), is an important pest of agronomical crops. It is interesting to discover secondary metabolites in plants that are environmentally safer than synthetic pesticides. For this purpose, Combretum trifoliatum crude extract and its isolated compounds were investigated for their insecticidal activities against S. frugiperda . RESULTS The median lethal dose (LD 50 ) was evaluated in the second‐instar larvae using the topical application method. The isolated compounds, apigenin and camphor, demonstrated a highly toxic effect on larvae at a lower LD 50 dose than crude extract. Moreover, when the larvae were exposed to crude extract concentrations, the development to pupa and adult stages was reduced by more than 50%. The ovicidal toxicity was examined using a hand sprayer. The extract concentration 5, 10, and 20 μg/egg significantly decreased the egg hatchability. In addition, crude extract showed a significant difference in inhibiting acetylcholinesterase (AChE) activity while crude extract and camphor showed significant inhibitory effects on carboxylesterase (CE) and glutathione‐ S ‐transferase (GST) activities. CONCLUSION The crude ethanol extract of Combretum trifoliatum was toxic to S. frugiperda in terms of larval mortality, negatively affecting biological parameters, and decreasing egg hatchability. Additionally, the activities of cholinergic and detoxifying enzymes were affected by crude extract and its isolated compounds. These results highlight that Combretum trifoliatum might be efficient as a bioinsecticide to control S. frugiperda . © 2023 Society of Chemical Industry.
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hal-04185083 , version 1 (22-08-2023)

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Veeravat Changkeb, Saksit Nobsathian, Gaelle Le Goff, Christine Coustau, Vasakorn Bullangpoti. Insecticidal efficacy and possibility of Combretum trifoliatum Vent . ( Myrtales: Combretaceae ) extracts in controlling Spodoptera frugiperda ( J.E. Smith ) ( Lepidoptera: Noctuidae ). Pest Management Science, 2023, ⟨10.1002/ps.7688⟩. ⟨hal-04185083⟩
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