Toxicity of Rhododendron anthopogonoides Essential Oil and Its Constituent Compounds towards Sitophilus zeamaisReport as inadecuate




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1

Department of Entomology, China Agricultural University, Haidian District, Beijing 100193, China

2

Institute of Chinese Materia Medica, Henan University, Kaifeng 475001, China

3

State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China

4

Analytical and Testing Center, Beijing Normal University, Beijing 100875, China





*

Authors to whom correspondence should be addressed.



Abstract The screening of several Chinese medicinal plants for insecticidal principles showed that essential oil of Rhododendron anthopogonoides flowering aerial parts possessed significant toxicity against maize weevils, Sitophilus zeamais. A total of 37 components were identified in the essential oil and the main constituents of the essential oil were 4-phenyl-2-butanone 27.22%, nerolidol 8.08%, 1,4-cineole 7.85%, caryophyllene 7.63% and γ-elemene 6.10%, followed by α-farnesene 4.40% and spathulenol 4.19%. Repeated bioactivity-directed chromatographic separation on silica gel columns led us to isolate three compounds, namely 4-phenyl-2-butanone, 1,4-cineole, and nerolidol. 4-Phenyl-2-butanone shows pronounced contact toxicity against S. zeamais LD50 = 6.98 mg-adult and was more toxic than either 1,4-cineole or nerolidol LD50 = 50.86 mg-adult and 29.30 mg-adult, respectively against the maize weevils, while the crude essential oil had a LD50 value of 11.67 mg-adult. 4-Phenyl-2-butanone and 1,4-cineole also possessed strong fumigant toxicity against the adults of S. zeamais LC50 = 3.80 mg-L and 21.43 mg-L while the crude essential oil had a LC50 value of 9.66 mg-L.

Keywords: Rhododendron anthopogonoides; Sitophilus zeamais; contact toxicity; fumigant; 4-phenyl-2-butanone; essential oil composition Rhododendron anthopogonoides; Sitophilus zeamais; contact toxicity; fumigant; 4-phenyl-2-butanone; essential oil composition





Author: Kai Yang 1, Yu Xin Zhou 2,* , Cheng Fang Wang 3, Shu Shan Du 3, Zhi Wei Deng 4, Qi Zhi Liu 1 and Zhi Long Liu 1,*

Source: http://mdpi.com/



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