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Molecules 2018, 23(5), 1200; https://doi.org/10.3390/molecules23051200

Identification of Insecticidal Constituents from the Essential Oil from the Aerial Parts Stachys riederi var. japonica

Department of Entomology and MOA Key Lab of Pest Monitoring and Green Management, College of Plant Protection, China Agricultural University, Haidian District, Beijing 100193, China
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Received: 3 May 2018 / Revised: 14 May 2018 / Accepted: 14 May 2018 / Published: 17 May 2018
(This article belongs to the Collection Bioactive Compounds)
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Abstract

The essential oil of Stachys riederi var. japonica (Family: Lamiaceae) was extracted by hydrodistillation and determined by GC and GC-MS. A total of 40 components were identified, representing 96.01% of the total oil composition. The major compounds in the essential oil were acetanisole (15.43%), anisole (9.43%), 1,8-cineole (8.07%), geraniol (7.89%), eugenol (4.54%), caryophyllene oxide (4.47%), caryophyllene (4.21%) and linalool (4.07%). Five active constituents (acetanisole, anisole, 1,8-cineole, eugenol and geraniol) were identified by bioactivity-directed fractionation. The essential oil possessed fumigant toxicity against maize weevils (Sitophilus zeamais) and booklice (Liposcelis bostrychophila), with LC50 values of 15.0 mg/L and 0.7 mg/L, respectively. Eugenol and anisole exhibited stronger fumigant toxicity than the oil against booklice. 1,8-Cineole showed stronger toxicity, and anisole as well as eugenol exhibited the same level of fumigant toxicity as the essential oil against maize weevils. The essential oil also exhibited contact toxicity against S. zeamais adults and L. bostrychophila, with LC50 values of 21.8 µg/adult and 287.0 µg/cm2, respectively. The results indicated that the essential oil of S. riederi var. japonica and its isolates show potential as fumigants, and for their contact toxicity against grain storage insects. View Full-Text
Keywords: Stachys riederi var. japonica; Sitophilus zeamais; Liposcelis bostrychophila; fumigant; contact toxicity; essential oil Stachys riederi var. japonica; Sitophilus zeamais; Liposcelis bostrychophila; fumigant; contact toxicity; essential oil
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Quan, M.; Liu, Q.Z.; Liu, Z.L. Identification of Insecticidal Constituents from the Essential Oil from the Aerial Parts Stachys riederi var. japonica. Molecules 2018, 23, 1200.

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