Fumigant toxicity and repellency effects of essential oil of Salvia mirzayanii on Callosobruchus maculatus (Col.: Bruchidae) and Tribolium confusum (Col.: Tenebrionidae)

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Abstract

In an attempt to find a natural and safe method for the control of stored-product pests, insecticidal activity and repellency effect of essential oil from Salvia mirzayanii Rech. F. & Esfand. were investigated against one day old adults of Callosobruchus maculatus (F.) (Col.: Bruchidae) and Tribolium confusum J du Val. (Col.: Tenebrionidae). The essential oil was obtained by hydrodistillation method, using a modified Clevenger-type apparatus. Experiments were carried out at 27 ± 1°C and 65 ± 5% R.H. in dark condition. Results of fumigant toxicity tests showed that the mortality of C. maculatus was increased significantly with increases in concentration and exposure time. LC50 value was 2.58 µL/L air for C. maculatus. Results indicated that C. maculatus was so susceptible to S. mirzayanii oil. LT50 values for C. maculatus were 9.73, 8.52, 7.17 and 7.08 h at 37.03, 111.11, 148.14 and 185.18 µL/L air, respectively. No mortality was observed on T. confusum at highest concentration (3703.70 µL/L air). Repellency was increased significantly with increases in concentration in both of species of the insects. The essential oil was significantly more repellent to T. confusum than C. maculatus. It is concluded that S. mirzayanii essential oil can be used as a safe pesticide to control stored insect pests, especially against C. maculatus.

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Journal of Entomological Society of Iran
Volume 30, Issue 2
March 2011
Pages 17-30

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