Oil Based Formulation of Beauveria bassiana (BB 112) Against Onion Thrips Thrips tabaci Lindeman


  • Murugasridevi K. Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu
  • S. Jeyarani Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu
  • K. Ramaraju Department of Agricultural Entomology, Centre for Plant Protection Studies, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu
  • S. Mohan Kumar Centre for Plant Molecular Biology and Biotechnology, Tamil Nadu Agricultural University, Coimbatore 641003, Tamil Nadu




Onion, Thrips tabaci, Beauveria bassiana, oil-based formulation, Bb 112, pathogenicity, delivery techniques, infectivity, persistence, CDA sprayer, LC50 , LT50 , bulb yield


Successful usage of entomopathogenic fungi for pest control under field conditions includes delivery techniques, infectivity and persistence of their inoculum in the environment. Pathogenicity tests performed with oil-based formulation of Beauveria bassiana (Bals.) Vuill (Bb 112) against onion thrips Thrips tabaci Lindeman revealed maximum virulence with the least LC50 and LT50 values of 1.25 x 105 spores/ml and 76.11 hr, respectively. Microplot trials showed oil-based formulation of Bb 112 was effective against T. tabaci when sprayed with Controlled Droplet Applicator (CDA) sprayer giving maximum cumulative reduction of 54.04%. Field experiments revealed oil-based formulation of Bb 112 @ 108 spores ml/l applied with CDA sprayer led to maximum cumulative reduction in thrips incidence (44.69 and 41.01%, respectively), at Kumarapalayam village, Coimbatore and Ambilikkai village, Dindigul districts. In addition, maximum onion yield of 14.66 and 16.23 t/ha was observed at Kumarapalayam and Ambilikkai, respectively. Mycoinsecticides applied with the CDA sprayer can be incorporated in management of T. tabaci.


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How to Cite

K., M., Jeyarani, S., Ramaraju, K., & Kumar, S. M. . (2021). Oil Based Formulation of <i>Beauveria bassiana</i> (BB 112) Against Onion Thrips <i>Thrips tabaci</i> Lindeman. Indian Journal of Entomology, 84(2), 268–273. https://doi.org/10.55446/IJE.2021.20



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