Antifeedant activity of essential oils of Achillea wilhelmsii and Teucrium polium on the Cowpea beetle, Callosobruchus maculatus (Coleoptera: Bruchidae)
عنوان دوره: دومین کنگره بین المللی حشره شناسی ایران
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چکیده
The cowpea beetle, Callosobruchus maculatus Fab. (Coleoptera: Bruchidae) is a one of the major pests infesting stored pulses and is distributed worldwide. In this research, efficiency of essential oils from Achillea wilhelmsii and Teucrium polium was evaluated against the Cowpea beetle, C. maculatus for its antifeedant activity. Several experiments were designed to measure the nutritional indices such as relative growth rate (RGR), Relative consumption rate (RCR), efficiency of conversion of ingested food (ECI) and feeding deterrence index (FDI). Treatments were carried out using a flour disk bioassay in the dark, at 27±1°C and 65±5% R.H. Concentrations of 0, 100, 500, 750, 1000, and 1500 ppm were prepared from each essential oil and 10 adult insects were introduced into each treatment. After 72 h, nutritional indices were calculated. An A. wilhelmsii oil was more effective than T. polium oils, by significantly decressed the RGR, RCR and ECI indices. Both of plant essential oils, with the same activity, increased FDI as the oil concentration was increased, showing high feeding deterrence activity against C. maculatus. Generally, antifeedant activity of A. wilhelmsii was more effective than T. polium.
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