Journal of Entomology and Zoology Studies

Volume 3, Issue 2

Fumigant toxicity and repellent effect of three Iranian Eucalyptus species against the lesser grain beetle, Rhyzopertha Dominica (F.) (Col.: Bostrichidae)

Author(s): Shiva Parsia Aref, Oruj Valizadegan

Abstract: In the present study, fumigant toxicity, repellent property and durability of essential oils of Eucalyptus dundasii Maiden, Eucalyptus floribunda F. Muell and Eucalyptus kruseana F. Muell were evaluated against the adults of Rhyzopertha dominica­ (F.). The essential oils were isolated with hydro-distillation method by Clevenger apparatus. Results of fumigant toxicity showed that as the concentration and exposure time increased, the mortality also increased. LC50 values for E. dundasii, E. floribunda and E. kruseana were achieved as 41.69, 34.39 and 27.98 μl/l air, respectively. For Repellent Index, it was found that all essential oils have repellent effect at concentrations of 70, 140 and 280 μl/l air and E. kruseana oil showed the highest repellency as compared to other essential oils. In the evaluation of durability of fumigant toxicity, it found that E. kruseana essential oil has more stable.

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