Efficacy of Biocontrol Agents in the Management of Onion Thrips, <I>Thrips tabaci</I> (Lind.) on Onion

S. Sudhir Kumar; C. T. Ashok Kumar; C. Shivaraju; M. Thippaiah

doi:10.18311/jbc/2012/3515

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Authors

S. Sudhir Kumar
Department of Agricultural Entomology, UAS, GKVK, Bengaluru, 560065, Karnataka ,IN
C. T. Ashok Kumar
Department of Agricultural Entomology, UAS, GKVK, Bengaluru, 560065, Karnataka ,IN
C. Shivaraju
Department of Agricultural Entomology, UAS, GKVK, Bengaluru, 560065, Karnataka ,IN
M. Thippaiah
Department of Agricultural Entomology, UAS, GKVK, Bengaluru, 560065, Karnataka ,IN

DOI:

https://doi.org/10.18311/jbc/2012/3515

Keywords:

Chrysoperla zastrowi sillemi, Beauveria bassiana, Onion, Thrips and Verticillium lecanii.

Abstract

Application of Beauveria bassiana (Bals) @ 1x 109 spores/ml twice was found to be best treatment with lowest mean thrips population (9.53/plant) with highest per cent reduction (64.15) followed by Verticillium lecanii (Zimmerman) @ 1x109 spores/ml (20 and 30 DAP) with 49.89 per cent reduction. Chrysoperla zastrowi sillemi 20,000 /ac (20 DAP) + B. bassiana @ 1x109 spores/ml (30 DAP) with 41.50 per cent reduction was found to be next best treatment. The treatment with C. z. sillemi @ 20,000 /ac (20 and 30 DAP) was least effective treatment with lowest per cent reduction (28.59).