1Department of Entomology, College of Horticulture, Bengaluru560065, Karnataka, India, University of Horticultural Sciences, Bagalkote 587104, Karnataka, India
2Department of Entomology, College of Horticulture, Kolar, 560065, Karnataka, India, University of Horticultural Sciences, Bagalkote 587104, Karnataka, India
3Department of Plant Pathalogy, College of Horticulture, Kolar560065, Karnataka, India, University of Horticultural Sciences, Bagalkote 587104, Karnataka, India
4Department of Post Harvest Management, College of Horticulture, Bengaluru560065, Karnataka, India, University of Horticultural Sciences, Bagalkote 587104, Karnataka, India
*Email: preethishankar96@gmail.com (corresponding author): ORCID ID 0009-0002-6329-4440
Online Published on 18 October, 2023.
This study was conducted to establish the baseline susceptibility data for Tetranychus urticae Koch, successfully maintained under laboratory conditions without exposure to acaricides. The leaf dip method of bioassay was used to establish the baseline susceptibility. Toxicity (LC50 value) varied across the major acaricides i.e., chlorfenapyr 10SC, propargite 57EC, fenazaquin 10EC, abamectin 3EC, spiromesifen 22.9SC and dicofol 18.5EC. Maximum toxicity was recorded for fenazaquin 10EC (0.08 ppm), followed by propargite 57EC, and the lowest was recorded with chlorfenapyr 10 SC (0.16 ppm). The LC50 values for all acaricides tested were lower than concentrations used as recommended field doses. This baseline data might be useful in monitoring and in the management of acaricide resistance in T. urticae.
Acaricides, Bioassay, LC50, Baseline, Susceptibility, Tetranychus urticae, Mortality, Fiducial limit, Mulberry leaves, Resistance, Fenazaquin, Propargite, Chlorfenapyr
