Evaluation of selected acaropathogenic fungi, botanicals and new acaricide molecules against Tetranychus urticae Koch (Prostigmata: Tetranychidae) on okra

Evaluation of selected acaropathogenic fungi, botanicals and new acaricide molecules against Tetranychus urticae Koch (Prostigmata: Tetranychidae) on okra

Authors

  • R. Aswathi Krishna Kerala Agricultural University
  • Haseena Bhaskar Kerala Agricultural University

Keywords:

Acaropathogenic fungi, Botanicals, Diafenthiuron, Fenazaquin, Spiromesifen, Tetranychus urticae

Abstract

Field study was conducted to evaluate two acaropathogenic fungi (Hirsutella thompsonii and Beauveria bassiana), two botanicals [neem oil 2 per cent and neem seed kernel extract (NSKE )5 per cent] and three new acaricide molecules (Fenazaquin 10 EC, Diafenthiuron 50 WP and Spiromesifen 240 SC) along with a standard check (Dicofol 18.5 EC) and an untreated control against Tetranychus urticae on okra during two seasons viz., February–May, 2012 and November, 2012–February, 2013. The new acaricide molecules fenazaquin 10 EC, diafenthiuron 50 WP and spiromesifen 240 SC exhibited high efficacy against T. urticae and significant reduction in mite population was observed ten days after treatment application. Among the botanicals evaluated, neem oil 2 per cent was found to be superior to NSKE 5 per cent during the second season, though on par with each other during the first season of study. Among the acaropathogenic fungi, B. bassiana was found to perform better than H. thompsonii during first season and was on par with each other during the second season. The study identified three novel acaricide molecules for the effective management of T. urticae though the bio-agents and botanicals did not give consistent results during the two seasons of study.

Author Biographies

R. Aswathi Krishna, Kerala Agricultural University

Department of Agricultural Entomology, College of Horticulture, Kerala Agricultural University

Haseena Bhaskar, Kerala Agricultural University

Department of Agricultural Entomology, College of Horticulture, Kerala Agricultural University

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Published

07-11-2016

How to Cite

Krishna, R. A., & Bhaskar, H. (2016). Evaluation of selected acaropathogenic fungi, botanicals and new acaricide molecules against Tetranychus urticae Koch (Prostigmata: Tetranychidae) on okra. Journal of Tropical Agriculture, 54(1), 21. Retrieved from https://jtropag.kau.in/index.php/ojs2/article/view/365

Issue

Section

Regular papers

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