Journal Article

Insecticide activity of essential oils of <i>Mentha longifolia</i>, <i>Pulicaria gnaphalodes</i> and <i>Achillea wilhelmsii</i> against two stored product pests, the flour beetle, <i>Tribolium castaneum,</i> and the cowpea weevil, <i>Callosobruchus maculatus</i>

Abbas Khani and Javad Asghari

in Journal of Insect Science

Volume 12, issue 1
Published online July 2012 | e-ISSN: 1536-2442 | DOI: https://dx.doi.org/10.1673/031.012.7301

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Essential oils extracted from the foliage of Mentha longifolia (L.) (Lamiales: Lamiaceae) and Pulicaria gnaphalodes Ventenat (Asterales: Asteraceae), and flowers of Achillea wilhelmsii C. Koch (Asterales: Asteraceae) were tested in the laboratory for volatile toxicity against two stored-product insects, the flour beetle, Tribolium castaneum Herbst (Coleoptera: Tenebrionidae) and the cowpea weevil, Callosobruchus maculatus F. (Coleoptera: Bruchidae). The chemical composition of the isolated oils was examined by gas chromatography-mass spectrometry. In M. longifolia, the major compounds were piperitenon (43.9%), tripal (14.3%), oxathiane (9.3%), piperiton oxide (5.9%), and d-limonene (4.3%). In P. gnaphalodes, the major compounds were chrysanthenyl acetate (22.38%), 2L -4L-dihydroxy eicosane (18.5%), verbenol (16.59%), dehydroaromadendrene (12.54%), β-pinen (6.43%), and 1,8 cineol (5.6%). In A. wilhelmsii, the major compounds were 1,8 cineole (13.03%), caranol (8.26%), alpha pinene (6%), farnesyl acetate (6%), and p-cymene (6%). C. maculatus was more susceptible to the tested plant products than T. castaneum. The oils of the three plants displayed the same insecticidal activity against C. maculatus based on LC50 values (between 1.54 µl/L air in P. gnaphalodes, and 2.65 µl/L air in A. wilhelmsii). While the oils of A. wilhelmsii and M. longifolia showed the same strong insecticidal activity against T. castaneum (LC50 = 10.02 and 13.05 µl/L air, respectively), the oil of P. gnaphalodes revealed poor activity against the insect (LC50 = 297.9 µl/L air). These results suggested that essential oils from the tested plants could be used as potential control agents for stored-product insects.

Keywords: fumigant toxicity; gas chromatography-mass spectrometry; mono terpenoids

Journal Article.  3211 words.  Illustrated.

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