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Mermans C, Dermauw W, Geibel S, Van Leeuwen T. Activity, selection response and molecular mode of action of the isoxazoline afoxolaner in Tetranychus urticae. PEST MANAGEMENT SCIENCE 2023; 79:183-193. [PMID: 36116012 DOI: 10.1002/ps.7187] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 09/13/2022] [Accepted: 09/18/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND Afoxolaner is a novel representative of the isoxazolines, a class of ectoparasiticides which has been commercialized for the control of tick and flea infestations in dogs. In this study, the biological efficacy of afoxolaner against the two-spotted spider mite Tetranychus urticae was evaluated. Furthermore, as isoxazolines are known inhibitors of γ-aminobutyric acid-gated chloride channels (GABACls), the molecular mode of action of afoxolaner on T. urticae GABACls (TuRdls) was studied using functional expression in Xenopus oocytes followed by two-electrode voltage-clamp (TEVC) electrophysiology, and results were compared with inhibition by fluralaner, fipronil and endosulfan. To examine the influence of known GABACl resistance mutations, H301A, I305T and A350T substitutions in TuRdl1 and a S301A substitution in TuRdl2 were introduced. RESULTS Bioasassays revealed excellent efficacy of afoxolaner against all developmental stages and no cross-resistance was found in a panel of strains resistant to most currently used acaricides. Laboratory selection over a period of 3 years did not result in resistance. TEVC revealed clear antagonistic activity of afoxolaner and fluralaner for all homomeric TuRdl1/2/3 channels. The introduction of single, double or triple mutations to TuRdl1 and TuRdl2 did not lower channel sensitivity. By contrast, both endosulfan and fipronil had minimal antagonistic activities against TuRdl1/2/3, and channels carrying single mutations, whereas the sensitivity of double and triple TuRdl1 mutants was significantly increased. CONCLUSIONS Our results demonstrate that afoxolaner is a potent antagonist of GABACls of T. urticae and has a powerful mode of action to control spider mites. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Catherine Mermans
- Department of Plants and Crops | Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Wannes Dermauw
- Department of Plants and Crops | Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
- Plant Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food (ILVO), Merelbeke, Belgium
| | - Sven Geibel
- CropScience Division, Bayer AG, Monheim, Germany
| | - Thomas Van Leeuwen
- Department of Plants and Crops | Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
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Suga T, Asami Y, Hashimoto S, Nonaka K, Iwatsuki M, Nakashima T, Sugahara R, Shiotsuki T, Yamamoto T, Shinohara Y, Ichimaru N, Murai M, Miyoshi H, Ōmura S, Shiomi K. Ascosteroside C, a new mitochondrial respiration inhibitor discovered by pesticidal screening using recombinant Saccharomyces cerevisiae. J Antibiot (Tokyo) 2015; 68:649-52. [PMID: 25944534 DOI: 10.1038/ja.2015.43] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Revised: 03/27/2015] [Accepted: 03/31/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Takuya Suga
- Department of Drug Discovery Sciences, Graduate School of Infection Control Sciences, Kitasato University, Tokyo, Japan
| | - Yukihiro Asami
- Department of Drug Discovery Sciences, Graduate School of Infection Control Sciences, Kitasato University, Tokyo, Japan.,Kitasato Institute for Life Sciences, Kitasato University, Tokyo, Japan
| | - Shohei Hashimoto
- Department of Chemistry, School of Science, Kitasato University, Kanagawa, Japan
| | - Kenichi Nonaka
- Department of Drug Discovery Sciences, Graduate School of Infection Control Sciences, Kitasato University, Tokyo, Japan.,Kitasato Institute for Life Sciences, Kitasato University, Tokyo, Japan
| | - Masato Iwatsuki
- Department of Drug Discovery Sciences, Graduate School of Infection Control Sciences, Kitasato University, Tokyo, Japan.,Kitasato Institute for Life Sciences, Kitasato University, Tokyo, Japan
| | - Takuji Nakashima
- Research Organization for Infection Control Sciences, Kitasato University, Tokyo, Japan
| | - Ryohei Sugahara
- Insect Growth Regulation Research Unit, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki, Japan
| | - Takahiro Shiotsuki
- Insect Growth Regulation Research Unit, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki, Japan
| | - Takenori Yamamoto
- Institute for Genome Research, University of Tokushima, Tokushima, Japan
| | - Yasuo Shinohara
- Institute for Genome Research, University of Tokushima, Tokushima, Japan.,Faculty of Pharmaceutical Sciences, University of Tokushima, Tokushima, Japan
| | - Naoya Ichimaru
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Masatoshi Murai
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Hideto Miyoshi
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Kyoto, Japan
| | - Satoshi Ōmura
- Kitasato Institute for Life Sciences, Kitasato University, Tokyo, Japan
| | - Kazuro Shiomi
- Department of Drug Discovery Sciences, Graduate School of Infection Control Sciences, Kitasato University, Tokyo, Japan.,Kitasato Institute for Life Sciences, Kitasato University, Tokyo, Japan
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Venzon M, Oliveira RM, Perez AL, Rodríguez-Cruz FA, Martins Filho S. Lime sulfur toxicity to broad mite, to its host plants and to natural enemies. PEST MANAGEMENT SCIENCE 2013; 69:738-743. [PMID: 23175352 DOI: 10.1002/ps.3431] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Revised: 08/31/2012] [Accepted: 10/15/2012] [Indexed: 06/01/2023]
Abstract
BACKGROUND An acaricidal effect of lime sulfur has not been demonstrated for Polyphagotarsonemus latus. However, lime sulfur can cause toxicity to natural enemies and to host plants. In this study, the toxicity of different concentrations of lime sulfur to P. latus, to the predatory mite Amblyseius herbicolus and to the predatory insect Chrysoperla externa was evaluated. Additionally, the phytotoxicity of lime sulfur to two P. latus hosts, chili pepper and physic nut plants, was determined. RESULTS Lime sulfur at a concentration of 9.5 mL L(-1) restrained P. latus population growth. However, this concentration was deleterious to natural enemies. The predatory mite A. herbicolus showed a negative value of instantaneous growth rate, and only 50% of the tested larvae of C. externa reached adulthood when exposed to 10 mL L(-1) . Physic nut had severe injury symptoms when sprayed with all tested lime sulfur concentrations. For chili pepper plants, no phytoxicity was observed at any tested concentration. CONCLUSION Lime sulfur might be used for P. latus control on chili pepper but not on physic nut owing to phytotoxicity. Care should be taken when using lime sulfur in view of negative effects on natural enemies. Selective lime sulfur concentration integrated with other management tactics may provide an effective and sustainable P. latus control on chili pepper.
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Affiliation(s)
- Madelaine Venzon
- Agriculture and Livestock Research Enterprise of Minas Gerais EPAMIG, 36570-000 Viçosa, Minas Gerais, Brazil.
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Degli Esposti M. Inhibitors of NADH-ubiquinone reductase: an overview. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1364:222-35. [PMID: 9593904 DOI: 10.1016/s0005-2728(98)00029-2] [Citation(s) in RCA: 378] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
This article provides an updated overview of the plethora of complex I inhibitors. The inhibitors are presented within the broad categories of natural and commercial compounds and their potency is related to that of rotenone, the classical inhibitor of complex I. Among commercial products, particular attention is dedicated to inhibitors of pharmacological or toxicological relevance. The compounds that inhibit the NADH-ubiquinone reductase activity of complex I are classified according to three fundamental types of action on the basis of available evidence and recent insights: type A are antagonists of the ubiquinone substrate, type B displace the ubisemiquinone intermediate, and type C are antagonists of the ubiquinol product.
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Affiliation(s)
- M Degli Esposti
- Department of Biochemistry and Molecular Biology, Monash University, 3168 Clayton, Victoria, Australia.
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