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Item Metadata only Insecticidal efficacy and possibility of Combretum trifoliatum Vent. (Myrtales: Combretaceae) extracts in controlling Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)(2023-01-01) Changkeb V.; Nobsathian S.; Le Goff G.; Coustau C.; Bullangpoti V.; Mahidol University, Combretum trifoliatum crude extract and its isolated compounds were investigated for their insecticidal activities against S. frugiperda. RESULTS: The median lethal dose (LD50) 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 LD50 dose than crude extract. Moreover, when the larvae were exposed to crude extract concentrations, the development to pupa and adult stages was reducedItem Metadata only Effect of isolated compounds from Combretum trifoliatum on toxicity and detoxification enzymes in Nilaparvata lugens(2025-12-01) Kumrungsee N.; Nobsathian S.; Chumworathayee W.; Phankaen P.; Dunkhunthod B.; Koul O.; Saiyaitong C.; Bullangpoti V.; Kumrungsee N.; Mahidol Universitytrifoliatum, its active isolated components, apigenin and camphor, and Finopril were tested for their ability to control the first to fifth instars of N. lugens. The C. trifoliatum crude extract and both allelochemicals showed insecticide potential (24 h-LC50... ~ 8.83–95.96 mg/L against each instar for crude extract), and their toxicity depended on the time of exposure. Camphor showed the higher efficacy (LD50 ~ 4.43 mg/L) and not different compared to Finopril. All plant compounds tested reducedItem Metadata only Toxicity of isolated phenolic compounds from Acorus calamus L. to control Spodoptera litura (Lepidoptera: Noctuidae) under laboratory conditions(2022-12-01) Wiwattanawanichakun P.; Saehlee S.; Yooboon T.; Kumrungsee N.; Nobsathian S.; Bullangpoti V.; Mahidol Universityhave been developed. Our research aimed to evaluate the insecticidal efficacy of Acorus calamus L. extract for the control of S. litura under laboratory conditions. Results: After 24 h of topical application, the A. calamus methanolic crude extract... showed toxicity against secondary instar S. litura larvae (LD50 ~ 7.438 µg/larva). Chrysin (5,7-dihydroxy flavone), one of the isolated phenolic compounds, showed optimal control efficiency (LD50 ~ 2.752 µg/larva) and showed a reductionItem Metadata only Synergistic interaction of thymol with Piper ribesioides (Piperales: Piperaceae) extracts and isolated active compounds for enhanced insecticidal activity against Spodoptera exigua (Lepidoptera: Noctuidae)(2022-12-01) Kumrungsee N.; Dunkhunthod B.; Manoruang W.; Koul O.; Pluempanupat W.; Kainoh Y.; Yooboon T.; Piyasaengthong N.; Bullangpoti V.; Nobsathian S.; Mahidol University), the reaction was antagonistic. CH2Cl2 extract and thymol were more toxic than the extract or thymol alone, and EtOAc extract was synergized by thymol if the components were combined at similar levels (1:1 thymol:EtOAc extract at the LD10 or LD30). MeOH extract... individually had moderate insecticidal activity, but all combinations with thymol were synergistic as binary mixtures. Isolated compounds, piperine, phenethyl cinnamamide and cinnamic acid represented synergistic, additive, and antagonistic action afterItem Metadata only Chrysoeriol isolated from Melientha suavis Pierre with activity against the agricultural pest Spodoptera litura(2022-12-01) Ruttanaphan T.; Thitathan W.; Piyasaengthong N.; Nobsathian S.; Bullangpoti V.; Mahidol UniversityBackground: Flavonoids, a class of plant phenolic compounds, act as plant defense chemicals. Chrysoeriol is a naturally occurring flavonoid produced by Melientha suavis Pierre. The goal of this study was to investigate the insecticidal potential... and mode of action of chrysoeriol isolated from M. suavis against Spodoptera litura (Fabricius). Results: The effects of chrysoeriol on second-instar S. litura larvae were determined by topical application. Chrysoeriol was highly toxic to S. litura (24