Essential oils extracted from the foliage of Mentha longifolia (L.) (Lamiales: Lamiaceae) and Pulicaria gnaphalodes Ventenat (Asterales: Asteraceae), and flowersof Achillea wilhelmsii C. Koch (Asterales: Asteraceae) were tested in the laboratory for volatile toxicity againsttwo stored-product insects, the flour beetle, Tribolium castaneum Herbst(Coleoptera: Tenebrionidae) and the cowpea weevil, Callosobruchus maculatusF. (Coleoptera: Bruchidae).The chemical composition of the isolated oils was examinedby 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. maculates 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 LC50values (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.
کلید واژگان :fumigant toxicity, gas chromatography-mass spectrometry, mono terpenoids
ارزش ریالی : 600000 ریال
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