Evaluation of <I>Beauveria bassiana</I> (Balsamo) Vuillemin against Coriander Aphid, <I>Hyadaphis coriandri</I> (Das) (Aphididae: Homoptera)

K. Selvaraj; H. D. Kaushik; Rachna Gulati

doi:10.18311/jbc/2012/3526

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Authors

K. Selvaraj
Department of Entomology, CCS Haryana Agricultural University, Hisar 125004, Haryana ,IN
H. D. Kaushik
Department of Entomology, CCS Haryana Agricultural University, Hisar 125004, Haryana ,IN
Rachna Gulati
Department of Entomology, CCS Haryana Agricultural University, Hisar 125004, Haryana ,IN

DOI:

https://doi.org/10.18311/jbc/2012/3526

Keywords:

Hyadaphis coriandri, Beauveria bassiana, Bioassay, LC⁵⁰, Pathogenicity and LT⁵⁰.

Abstract

Laboratory bioassays were carried with seven different concentrations of Beauveria bassiana against Hyadaphis coriandri by using detached leaf bioassay technique with slight modifications. The mortality in treated aphids increased in conidial spore concentration. The highest concentration (1x10¹⁰ conidia ml^-1) caused maximum cumulative mortality (96.85%) at 7 days after treatment compared to the lowest concentration (1í—10⁴ conidia ml^-1) with 67.61 per cent mortality. The median lethal concentration (LC₅₀) value recorded with B. bassiana was 1.5x10⁴ conidia ml^-1 in mixed H. coriandri population. Median lethal time (LT₅₀) values were found to be inversely proportional to the spore concentration of B. bassiana and were observed as 45.70, 67.60, 71.30, 87.04, 97.72, 120.26 and 141.57 h for 10¹⁰, 10⁹, 10⁸, 10⁷, 10⁶, 10⁵, 10⁴ conidia ml^-1, respectively.