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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820
EISSN: 0718-5839
Vol. 72, No. 2, 2012, pp. 188-194
Bioline Code: cj12030
Full paper language: English
Document type: Research Article
Document available free of charge

Chilean Journal of Agricultural Research, Vol. 72, No. 2, 2012, pp. 188-194

 en CHEMICAL CONSTITUENTS AND TOXICITY OF ESSENTIAL OILS OF ORIENTAL ARBORVITAE, Platycladus orientalis check for this species in other resources (L.) FRANCO, AGAINST THREE STORED-PRODUCT BEETLES
Hashemi, Seyed Mehdi & Safavi, Seyed Ali

Abstract

Plant secondary metabolites play an important role in plant-insect interactions and therefore such compounds may have insecticidal or biological activity against insects. Fumigant toxicity of essential oils of leaves and fruits from oriental arborvitae ( Platycladus orientalis check for this species in other resources [L.] Franco) (Cupressaceae) was investigated against adults of cowpea weevil ( Callosobruchus maculatus check for this species in other resources Fab.), rice weevil ( Sitophilus oryzae check for this species in other resources L.), and red flour beetle ( Tribolium castaneum check for this species in other resources Herbst). Fresh leaves and fruits were subjected to hydrodistillation using a Clevenger-type apparatus and the chemical composition of the volatile oils was studied by gas chromatography-mass spectrometry (GC-MS). Twenty-six compounds (92.9%) and 23 constituents (97.8%) were identified in the leaf and the fruit oils, respectively. The major components of both leaves and fruits oils were α-pinene (35.2%, 50.7%), α-cedrol (14.6%, 6.9%) and Δ-3-carene (6.3%, 13.8%), respectively. Both oils in the same concentration were tested for their fumigant toxicity on each species. Results showed that leaf oils were more toxic than fruit oils against three species of insects. Callosobruchus maculatus was more susceptible than S. oryzae and T. castaneum. LC50 values of the leaf and the fruit oils at 24 h were estimated 6.06 and 9.24 μL L-1 air for C. maculatus, 18.22 and 21.56 μL L-1 air for S. oryzae, and 32.07 and 36.58 μL L-1 air for T. castaneum, respectively. These results suggested that P. orientalis oils may have potential as a control agent against C. maculatus, S. oryzae, and T. castaneum.

Keywords
Botanical insecticides, fumigation, Platycladus orientalis, stored-product insects

 
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