Journal of Biological Control

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The efficacy of two entomopathogenic fungi, Metarhizium anisopliae and Beauveria bassiana, against white grub, Holotrichia consanguinea infesting potato crop was studied under laboratory and field conditions. The estimated LC50 of M. anisopliae and B. bassiana towards third instar larvae of H. consanguinea were 5.76 x 105 and 7.50 x 105 conidia ml-1, respectively. The LT50 of M. anisopliae and B. bassiana at the concentration of 8 x 105 conidia ml-1 against third instar larvae of H. consanguinea were 4.88 and 6.73 days, respectively. In field experiments, M. anisopliae @ 2 x 1012 conidia ha-1 was found to be effective with an average efficacy of 46.74%, while it was 41.32% in phorate 10G @ 25kg ha-1. The maximum mycosis was recorded with the use of M. anisopliae (44.44%). The tuber infestation was statistically lowest (6.91%) and yield of marketable tubers highest (27.6t ha-1) with the use of M. anisopliae as against 27.85% and 17.8t ha-1 in untreated plot, respectively.

Keywords

Beauveria bassiana, Holotrichia consanguinea, Metarhizium anisopliae and Potato.
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