Acute, Lethal and Synergistic Effects of Some Terpenes Against Tribolium castaneum Herbst (Coleoptera: Tenebrionidae)
Journal Title: Ecologia Balkanica - Year 2012, Vol 4, Issue 1
Abstract
Terpenes are found in abundance in all plant essential oils. In the present study two pure volatile compounds of terpene group, α-pinene and β-caryophyllene have been evaluated for their repellent, acute toxicity and developmental inhibitory activities alone and in binary combination against red flour beetle Tribolium castaneum. In repellency assay, α-pinene and β-caryophyllene repelled T. castaneum adults significantly even at 0.025% concentrations. Fumigation of larvae and adults of T. castaneum with these two compounds caused lethality in them. Median lethal concentrations (LC50) of α-pinene and β-caryophyllene against adults were 0.998 and 1.624 μl/cm3 and against larvae were 1.379 and 1.949 μl/cm3 respectively. In binary combination, the LC50 values against adults and larvae were found 1.277 and 1.438 μl/cm3 respectively. Fumigation with two sublethal concentrations viz. 40 and 80% of 24-h LC50 of these two compunds alone and in binary combination significantly reduced oviposition potential of adults and inhibited pupation and adult emergence in larvae. All the responses were found concentration-dependent. From the present study, it can be concluded that α-pinene is more active than β-caryophyllene and these two volatile compounds in binary combination shows synergism and thus, can used as efficient insecticidal tool against T. castaneum as fumigant either alone or in combination.
Authors and Affiliations
M. Chaubey
Keywords
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