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Insects 2016, 7(3), 42;

Improving Efficacy of Beauveria bassiana against Stored Grain Beetles with a Synergistic Co-Formulant

Exosect Ltd., Leylands Business Park, Colden Common, Winchester SO21 1TH, UK
Agrauxine, 18 Route De Mauvieres, Loches 37600, France
Author to whom correspondence should be addressed.
Academic Editors: Nickolas Kavallieratos, Christos Athanassiou, Vincenzo Palmeri and Orlando Campolo
Received: 19 July 2016 / Revised: 16 August 2016 / Accepted: 19 August 2016 / Published: 26 August 2016
(This article belongs to the Special Issue Alternatives to Chemical Control of Stored-Product Insects)
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The potential of a dry powder co-formulant, kaolin, to improve the control of storage beetles by the entomopathogenic fungus Beauveria bassiana, isolate IMI389521, was investigated. The response of Oryzaephilus surinamensis adults to the fungus when applied to wheat at 1 × 1010 conidia per kg with and without kaolin at 1.74 g per kg wheat was assessed. Addition of kaolin increased control from 46% to 88% at day 7 and from 81% to 99% at day 14 post-treatment. Following this the dose response of O. surinamensis and Tribolium confusum to both kaolin and the fungus was investigated. Synergistic effects were evident against O. surinamensis at ≥0.96 g of kaolin per kg of wheat when combined with the fungus at all concentrations tested. For T. confusum, adult mortality did not exceed 55%, however, the larvae were extremely susceptible with almost complete suppression of adult emergence at the lowest fungal rate tested even without the addition of kaolin. Finally, the dose response of Sitophilus granarius to the fungus at 15 and 25 °C, with and without kaolin at 1 g per kg of wheat, was examined. Improvements in efficacy were achieved by including kaolin at every fungal rate tested and by increasing the temperature. Kaolin by itself was not effective, only when combined with the fungus was an effect observed, indicating that kaolin was having a synergistic effect on the fungus. View Full-Text
Keywords: co-formulant; biopesticide; synergy; Beauveria bassiana; kaolin; entomopathogenic fungi co-formulant; biopesticide; synergy; Beauveria bassiana; kaolin; entomopathogenic fungi

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Storm, C.; Scoates, F.; Nunn, A.; Potin, O.; Dillon, A. Improving Efficacy of Beauveria bassiana against Stored Grain Beetles with a Synergistic Co-Formulant. Insects 2016, 7, 42.

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