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Popoola AO*
Osipitan AA
Afolabi CG
Oke OA
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Popoola AO*
Osipitan AA
Afolabi CG
Oke OA
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International Journal of Entomology and Nematology

Biological control of larger grain borer, Prostephanus truncatus (Horn) (Coleoptera: Bostrichidae) with entomopathogenic fungi - Beauveria bassiana (Balsamo) vaillemin (Hypocreales: Cordycipitaceae)

Popoola AO, Osipitan AA, Afolabi CG, Oke OA

Accepted 20 January, 2015

Citation: Popoola AO, Osipitan AA, Afolabi CG, AA, Oke OA (2015). Biological control of larger grain borer, Prostephanus truncatus (Horn)(Coleoptera: Bostrichidae) with entomopathogenic fungi - Beauveria bassiana (Balsamo) vaillemin (Hypocreales: Cordycipitaceae). International Journal of Entomology and Nematology, 2(1): 002-008.

Copyright: © 2015 Popoola et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Abstract

The use of synthetic insecticide has been faced with challenges of resistance among other drawbacks. This has necessitated the search for bio-pesticide that are environmentally friendly, non-toxic to humans and have a residual effect. This study evaluated the entomopathogenic fungi, Beauveria bassiana for biological control of larger grain borer (LGB) Prostephanus truncatus in maize grains. Pathogenicity examination of dead adult LGB in maize grains treated with conidia of B. bassiana was done to confirm the source of LGB mortality in B. bassiana treated maize grains. Adult dead LGB were subjected to high humidity and observed for the growth of white mould (Muscadine disease), which was cultured on Potato Dextrose Agar and identified.  Eighty six percent of the dead insects from treated maize grains showed fungal growth B. bassiana. Mortality of LGB generally increased with the concentration and the exposure time of the treatments. The “weight of grain dust”, “percentage of grain damaged” and “percentage of grain weight loss” were significantly (p<0.05) higher in the untreated maize kernels. Beauvaria bassiana formulation was effective in controlling LGB and is recommended for maize storage. Further studies should be conducted to test the formulation under farmer situations in order to deal with practical challenges.

Key words: Beauveria bassiana, fungal growth, pathogenicity, potato dextrose agar, mortality