Study on the Effect of Storage Conditions of Beauveria bassiana WP Formulations on its Survival Rate and Infectivity to Rice hispa, Dicladispa armigera (Olivier), Chrysomelidae Coleoptera | Chapter 8 | Contemporary Research and Perspectives in Biological Science Vol. 5

The wettable powder formulation was developed by using the aerial conidia of the entomopathogenic fungus Beauveria bassiana. The insecticidal efficacy of the prepared formulation against two-day-old adult Rice hispa, Dicladispa armigera, was evaluated based on different storage temperatures. The shelf life of a talc-based wettable powder formulation of Beauveria bassiana (Bals.) Vuill. was tested at room temperature (24±1°C), refrigerated conditions (4°C), and in deep freeze conditions (–4°C to –6°C). At room temperature, the conidia remained viable for up to 180 days, maintaining a density of 20.22 × 107 conidia/gm and exhibiting 48% pathogenicity. In refrigerated conditions, viability extended to 210 days with the same conidial density, but pathogenicity increased to 69.45%. However, under deep freeze conditions, viability lasted for 300 days with the same conidial load, though pathogenicity dropped significantly to 20%.

 

Author (s) Details

Purnima Das
Department of Entomology, Assam Agricultural University, Jorhat-13, India.

 

L.K. Hazarika
Department of Entomology, Assam Agricultural University, Jorhat-13, India.

 

K.C. Puzari
Department of Plant Pathology, Assam Agricultural University, Jorhat-13, India.

 

D. Bora
Department of Life Sciences, Dibrugarh University, Dibrugarh, India.

 

S. Ray
Department of Entomology, Assam Agricultural University, Jorhat-13, India.

 

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