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1 February 2009 Methyl Palmitate, an Acaricidal Compound Occurring in Green Walnut Husks
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Abstract

Walnut, Juglans regia L., is known for its insecticidal activities to a range of herbivores and microbes. Isolation and identification of bioactive compounds from walnut is a potential approach for the development of new pesticides. Laboratory experiments were carried out to investigate the acaricidal activities of green husk extracts of walnut. Bioassay-guided fractionation of petroleum-ether extracts of walnut led to the identification of a common plant-borne fatty acid ester, methyl palmitate (MP), which produced strong acaricidal activity (62.8% mortality) at 1 mg/ml at 24 h. The structure of MP was characterized with infrared spectrum and NMR, and the identification of MP confirmed using an authentic standard on high-performance liquid chromatography. Based on a slide dip bioassay, 10 mg/ml MP provided 97.9% mortality against adults of Tetranychus cinnabarinus (Boisduval) (Acari: Tetranychidae), whereas mortality against eggs was much lower (57.2%).

© 2009 Entomological Society of America
Y. N. Wang, H. X. Wang, Z. J. Shen, L. L. Zhao, S. R. Clarke, J. H. Sun, Y. Y. Du, and G. L. Shi "Methyl Palmitate, an Acaricidal Compound Occurring in Green Walnut Husks," Journal of Economic Entomology 102(1), 196-202, (1 February 2009). https://doi.org/10.1603/029.102.0128
Received: 8 March 2008; Accepted: 1 October 2008; Published: 1 February 2009
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