Abstract
Bioefficacy of Beauveria bassiana (Balsamo) Vuillemin and Lecanicillium lecanii Zimmerman in comparison with their commercial formulations along with standard check insecticide, Fenvalerate 20 EC were evaluated against onion thrips, Thrips tabaci Lindeman under greenhouse as well as field conditions. The results revealed that the standard check fenvalerate 20 EC @ 0.0075 % showed significantly the highest cumulative corrected mortality of 97.84 % followed by commercial formulation of B. bassiana, Myco-Jaal @ 1 × 108 spores/mL which showed 80.90 % mortality. The laboratory cultured B. bassiana showed percent mortalities of 74.11, 71.69 and 78.48 % for the concentrations of 1.23 × 107, 1.23 × 106 and 1.23 × 108 spores/mL, respectively. However, these concentrations were statistically at par on all the days of observation. Thrips mortality gradually increased with the increase in concentrations of fungal preparations and days of observations. Similar trend was also observed in L. lecanii experiment. Under field conditions, Fenvalerate 20 EC @ 0.0075 % recorded highest mortality of T. tabaci (90.10 %) followed by commercial formulation of V. lecanii (Phule Bugicide @ 2 × 108 cfu/g) with 74.90 % mortality. All the concentrations of fungal concentrations gave low mortality ranging from 9.40 to 10.10 % and 7.10 to 7.40 % at 2 days after treatment (DAT) of B. bassiana and L. lecanii, respectively. The standard check of Fenvalerate 20 EC @ 0.0075 % was highly toxic and showed significantly maximum percent reduction (90.50 %) of T. tabaci population in both the experiments. The present study clearly shows that these entomopathogens may be integrated with existing integrated pest management (IPM) practices for management of T. tabaci.
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Authors highly thankful to Indian Council of Agricultural Research (ICAR), New Delhi and Head, Department of Entomology, CCSHAU, Hisar for providing financial assistance and providing facilities to conduct this experiment, respectively. The authors declare that there is no conflict of interest among them and financial interest with respect to this manuscript.
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Annamalai, M., Kaushik, H.D. & Selvaraj, K. Bioefficacy of Beauveria bassiana (Balsamo) Vuillemin and Lecanicillium lecanii Zimmerman against Thrips tabaci Lindeman. Proc. Natl. Acad. Sci., India, Sect. B Biol. Sci. 86, 505–511 (2016). https://doi.org/10.1007/s40011-014-0475-8
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DOI: https://doi.org/10.1007/s40011-014-0475-8