Baseline Susceptibility of Red Spider Mite Tetranychus urticae Koch on Tomato to Selected Acaricides Preethi S1,*, Reddy Aswathanarayana2, Jayapa J1, Reddy T B Manjunatha3, Thulsiram K2, Sadanada G K4 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. Abstract 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. Top Keywords Acaricides, Bioassay, LC50, Baseline, Susceptibility, Tetranychus urticae, Mortality, Fiducial limit, Mulberry leaves, Resistance, Fenazaquin, Propargite, Chlorfenapyr. Top |