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Abstract
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Among biological control agents, fungi are usable as supplement or alternative to insecticides. Beauveria bassiana is well
known entomopathogenic fungai with high host range. Due to healthy and environmental risks of chemical pesticides, it is
important to change the methods in organic agriculture by using biopesticides and essential oils. In this study, the effects of
essential oils from seed of Petroselinum sativum Hoffmann, Satureja sahendica Bornm and Heracleum persicum Desf were
evaluated on the growth and sporulation of B. bassiana to access their compatibility. The study was conducted with
maximum concentration of each essential oil that were mortal for Callosobruchus maculatus (F.) (for P. sativum, S.
sahendica and H. persicum, 25, 1 and 12 µl respectively) and replicate thrice with a control treatment on PDA medium in
25±1°C. The growth of fungi was evaluated after 15 days, after application. In the Petri dishes containing P. sativum
essential oil, the fungus showed no growth. It seems, P. sativum essential oil is incompatible with the fungus, but, S.
sahendica and H. persicum essential oils allowed 24% and 25% of growth to the fungus in the media, respectively.
Evaluation of compatibility of the essential oils with B. bassiana were calculated by T value as 0, 19.9 and 25 percent for P.
sativum, S. sahendica and H. persicum, respectively, which confirm the above mentioned results.
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