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H. Khader Khan ¹, M. Gopalan ², R. J. Rabindra ²

Affiliations
1 Directorate of Extension, UAS, Hebbal, Bangalore - S60 024, IN
2 Department of Entomology, TamilNadu Agricultural University, Coimbatore - 641003, IN

Abstract

Beauveria bassiana (Bals.) Vuill and Metarhizium anisopliae var. anisopliae (Metsch.) Sorkin when grown at temperatures of 25 and 30°C recorded maximum biomass, mycelial growth, conidial count and conidia. At these temperature they were highly Infective against Odontotermes brunneus Hagen. At temperatures below 25°C and above 30°C there was marked and significant reduction in the biometric characteristics and infectivity.

Keywords

Beauveria bassiana, Metarhizium anisopliae, Odontotermes brunneus Infectivity, Temperature Effects.

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H. Khader Khan ¹, S. Jayaraj ¹, R. J. Rabindra ¹

Affiliations
1 Department of Entomology, TNGDNAU, Coimbatore-641 003, IN

Abstract

The entomopathogenic fungi viz., Beauveria bassiana (Bals.) Vuill., Metarhizium anisopliae (Metsch.) Sorokin var. anisopliae, M. flavoviride Gams & Rozsypal var. minus Rombach, Humber and Roberts., Verticillium lecanii Zimm., Paecilomyces lilacinus (Thom.) Samson., and P. fumosoroseus (Wlze) Brown & Smith were pathogenic to the sweet potato weevil eylas jormicarius (F.), Among these, the first three mycopathogens, listed above, were highly virulent and V. lecanii, P. lilacinus and P. fumosoroseus proved to be weak pathogens against this pest. B. bassiana was the most effective recording the lowest LC₅₀ and LT₅₀ values followed by M. anisopliae and M. flavoviride.

Keywords

Cylas formicarius Mycopathogens, Laboratory Evaluation.

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H. Khader Khan ¹, M. Gopalan ², S. Jayaraj ²

Affiliations
1 Directorate of Extension, EEU, Hebbal, Bangalore - 560 024, IN
2 Department of Entomology, Tamil Nadu Agricultural University, Coimbatore - 641 003, IN

Abstract

Although five entomogenous fungi were pathogenic to the three mound building termites i.e. Odontotermes wallonensis (Wasmann), O. obesus (Rambur) and O. brunneus (Hagen), only Beauveria bassiana (Bals.) Vuill, and Metarhizium anisopliae (Metsch.) Sorokin var. anisopliae were highly virulent when compared to M. flavoviride Gams Rozypal var. minus, Paecilomyces lilacinus (Thom.) Samson and P. fumosoroseus (Wize) Brown and Smith. Among the three mound building termite species, O. brunneus was the most susceptible followed by O. wallonensis and O. obesus. This was confirmed through bioassay studies with the different isolates of B. bassiana and M. anisoplieae. Bapatla isolate of B. bassiana with the lowest LC₅₀ and LT₅₀ values was the most effective against all the three termite species tested.

Keywords

Odontotermes wattonensis, O. obesus, O. brunneus, Susceptibility, Beauveria bassiana, Metarhizium antsopliae, M. flavoviride, Paecilomyces lilacinus, P. fumosoroseus.

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