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Susceptibility to Acaricides and the Frequencies of Point Mutations in Etoxazole- and Pyridaben-Resistant Strains and Field Populations of the Two-Spotted Spider Mite, Tetranychus urticae (Acari: Tetranychidae)

1
Department of Plant Medicine, College of Agriculture, Life and Environment Sciences, Chungbuk National University, Cheongju 28644, Korea
2
Crop Protection Division, National Institute of Agricultural Science, Wanju 55365, Korea
*
Author to whom correspondence should be addressed.
First coauthor.
Insects 2021, 12(7), 660; https://doi.org/10.3390/insects12070660
Received: 7 June 2021 / Revised: 15 July 2021 / Accepted: 16 July 2021 / Published: 20 July 2021
Tetranychus urticae Koch is a difficult-to-control pest due to its short life cycle and rapid resistance development. Strains exhibiting resistance to etoxazole or pyridaben exposure have been identified over the past 16 years We collected 8 T. urticae field populations from Korea. The resistance ratios of the etoxazole- and pyridaben-resistant (ER and PR) strains were significantly higher than the susceptible strain. The ER and PR strains showed cross-resistance to several acaricides. In addition, the point mutations of the target site were detected in resistant populations.
The two-spotted spider mite Tetranychus urticae Koch is a major agricultural pest worldwide and is known to rapidly develop resistance to pesticides. In the present study, we explored a field strain that was collected in 2000 and 2003 and has been exhibiting resistance to etoxazole and pyridaben over the last 16 years. The resistance ratios of the etoxazole- and pyridaben-resistant strains (ER and PR) to etoxazole or pyridaben were more than 5,000,000- and 4109.6-fold higher than that of the susceptible strain, respectively. All field-collected populations showed resistance to etoxazole and pyridaben. The ER and PR strains showed cross-resistance to several acaricides. Both I1017F and H92R point mutations were detected in 7 out of 8 field groups. Spirodiclofen and spiromesifen resulted in more than 77.5% mortality in the 8 field groups. In addition, the genotype frequency of the I1017F point mutation was 100.0% in the ER strain, and that of the H92R point mutation was 97.0% in the PR strain. All of the field populations were found to have a high frequency of I1017F. These results suggest that the observation of resistance patterns will help in designing a sustainable IPM program for T. urticae. View Full-Text
Keywords: Tetranychus urticae; etoxazole; pyridaben; point mutation; resistance Tetranychus urticae; etoxazole; pyridaben; point mutation; resistance
MDPI and ACS Style

Koo, H.-N.; Choi, J.; Shin, E.; Kang, W.; Cho, S.-R.; Kim, H.; Park, B.; Kim, G.-H. Susceptibility to Acaricides and the Frequencies of Point Mutations in Etoxazole- and Pyridaben-Resistant Strains and Field Populations of the Two-Spotted Spider Mite, Tetranychus urticae (Acari: Tetranychidae). Insects 2021, 12, 660. https://doi.org/10.3390/insects12070660

AMA Style

Koo H-N, Choi J, Shin E, Kang W, Cho S-R, Kim H, Park B, Kim G-H. Susceptibility to Acaricides and the Frequencies of Point Mutations in Etoxazole- and Pyridaben-Resistant Strains and Field Populations of the Two-Spotted Spider Mite, Tetranychus urticae (Acari: Tetranychidae). Insects. 2021; 12(7):660. https://doi.org/10.3390/insects12070660

Chicago/Turabian Style

Koo, Hyun-Na, Jihye Choi, Eungyeong Shin, Wonjin Kang, Sun-Ran Cho, Hyunkyung Kim, Bueyong Park, and Gil-Hah Kim. 2021. "Susceptibility to Acaricides and the Frequencies of Point Mutations in Etoxazole- and Pyridaben-Resistant Strains and Field Populations of the Two-Spotted Spider Mite, Tetranychus urticae (Acari: Tetranychidae)" Insects 12, no. 7: 660. https://doi.org/10.3390/insects12070660

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