Investigation of insecticidal activity of two species on stored-product insects.

This study was designed to investigate the insecticidal activity of the essential oils (EOs) and extracts from and . The EOs were extracted from the leaves of and by hydro-distillation and their chemical components were analyzed by gas chromatography-mass spectrometry (GC-MS). The repellency, contact toxicity and antifeedant activity of the EOs and extracts were evaluated against and along with those of their main components. A total of nine compounds were identified from the EO of , and the most abundant component was myristicin (79.72%). The EO of exhibited repellent activities at different levels and its main compound myristicin showed contact toxicity and repellent effects against and . Meanwhile, by bioassay-guided fractionation, four compounds with strong antifeedant activities against , 24-methylenecycloartanyl-2'E, 4'Z-tetradecadienoate (1), methyl thyrsiflorin B acetate (2), friedelin (3) and Excoecarin R1 methyl ester (4) were separated and identified from the ethanol extract of for the first time. Considering the significant anti-insect activities, the EOs and extracts of and might be used in integrated pest strategies, establishing a good perspective for the comprehensive use of natural plant resources of genus.