Compatibility of the entomopathogenic fungus Beauveria bassiana with the insecticides fipronil, pyriproxyfen and hexaflumuron

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Abstract

The compatibility of Beauveria bassiana isolate DEBI 002 (Atashgah) with fipronil, pyriproxyfen
and hexaflumuron insecticides was assayed. To determine the impact of the insecticides on the
germination of the fungal spore, different concentrations of the compounds were added to the culture
medium (malt agar). In order to calculate the mycelial growth in different treatments, each colony
diameter was measured and the spores were counted in the surface area to assess its sporulation. The
results showed that pyriproxyfen at 1500 ppm and hexaflumuron at 80 ppm completely inhibited mycelial
growth, while the inhibitory effect of fipronil at 1600 ppm remained at 76.6%. The inhibitory effect of
lower concentrations of all three insecticides was between 10 and 20%. All tested insecticides inhibited
the spore production between 80 to 100% at the highest concentrations without any significant
differences. Pyriproxyfen at 400 ppm and hexaflumuron at all concentrations completely inhibited spore
germination, with significant difference, comparing with the rest of treatments. The results indicate that
hexaflumuron has the highest inhibitory effect on the spore germination and is not recommended to be
used simultaneously with B. bassiana against the insect pests.

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Journal of Entomological Society of Iran
Volume 31, Issue 2
March 2012
Pages 29-37

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