Abstract
Tetranychus urticae Koch (Acari: Tetranychidae), twospotted spider mite, is a major secondary pest of strawberry and can cause significant yield loss. Tetranychus urticae is typically controlled using miticides, which has led to rapid resistance development. In South Carolina (USA), extension agents and growers have reported field failures of miticides (inadequate pest suppression), but resistance has not been quantitatively determined. In 2018, we determined the level of miticide resistance of six T. urticae populations found on strawberry across South Carolina. We examined efficacy of all miticides registered for use on US strawberry by conducting an initial diagnostic bioassay at 20% of the maximum labeled field rate. Any population × active ingredient combination resulting in < 55% mortality was identified as ‘potentially resistant’ and concentration–response bioassays were then conducted to calculate LC50 values for an individual population. These values were compared with those of a known-susceptible laboratory population to calculate resistance ratios (RR). Our results indicate that examined South Carolina populations of T. urticae from strawberry were highly resistant to bifenthrin (RR = 100–60,000) and there was reduced susceptibility to fenbutatin-oxide (RR = 25–123). The 'Sardinia' population had decreased abamectin susceptibility (RR = 25). No resistance to hexythiazox, etoxazole, acequinocyl, bifenazate, fenpyroximate, spiromesifen, or cyflumetofen was found. Based on available data, it appears that miticide resistance is not a likely cause of field failures and issues related to application error and coverage should be investigated. Overall, this work supports the need to reduce the use of broad-spectrum pesticides and older products, in favor of newer miticide chemistries due to resistance issues.
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Data and materials associated with this experiment are available upon request.
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Code associated with this experiment is available upon request.
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Acknowledgements
The authors thank M. Farfan, D. Lewis, J. Coffey, K. Dennis, S. Ellis, D. Madden, and G. Sinclair for technical assistance. They also thank Drs. Sriyanka Lahiri and Wee Yee for comments on an earlier draft of this manuscript. The use of trade, firm, or corporation names in this publication is for the information and convenience of the reader. Such use does not constitute an official endorsement or approval by the United States Department of Agriculture or the Agricultural Research Service of any product or service to the exclusion of others that may be suitable.
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This project was supported by the Southern Region Small Fruit Consortium and through industry gifts of pesticide.
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PEB conducted the experiments, wrote the manuscript, and led manuscript editing. RSJ designed the experiments, assisted with manuscript writing, and contributed to manuscript editing.
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Bergeron, P.E., Schmidt-Jeffris, R.A. Spider mite resistance to miticides in South Carolina strawberry and implications for improved integrated pest management. Exp Appl Acarol 84, 407–418 (2021). https://doi.org/10.1007/s10493-021-00621-7
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DOI: https://doi.org/10.1007/s10493-021-00621-7