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Litoriya NS, Kalasariya RL, Parmar KD, Patel JH, Patel SH, Chaudhary NN, Chauhan NR, Chawla S, Shah PG. Dissipation and dietary risk assessment of fluoxapiprolin (and its metabolites) residues in cucumber and tomato samples under field conditions. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2024:1-13. [PMID: 39038065 DOI: 10.1080/19440049.2024.2380918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2024] [Accepted: 07/09/2024] [Indexed: 07/24/2024]
Abstract
The present study was undertaken to understand the dissipation behaviour/kinetics of fluoxapiprolin and its metabolites in cucumber and tomato under field conditions. A QuEChERS based extraction method followed by liquid chromatography coupled to mass spectrometry (LC-MS/MS) analysis showed that all method validation parameters were within the acceptable range as per international standards with a limit of quantitation (LOQ) of 0.01 mg kg-1 for all analytes. As significant matrix effects were observed with a few metabolites, matrix matched standards were used for the whole study. Residues of fluoxapiprolin in cucumber at standard dose were steady from 0 to 3 day after application and were below LOQ on the 5th day after application. In cucumber fruit at double dose and in tomato at both the doses the residues followed second-order kinetics and were respectively ≤ LOQ from days 7 and 14 onwards. Pre-harvest intervals (PHI) of 5 days and 14 days are proposed for cucumber and tomato fruits respectively. All the metabolites were ≤ LOQ from day 0 in all the matrices. The consumer risk, assessed as Hazard Quotient (HQ), showed that HQ was ≤1 in all the cases. The results of the present study and earlier studies on other similar fungicides suggest that the use of fluoxapiprolin in cucumber and tomato fruits may not pose health or environmental hazards provided that good agricultural practices are followed and the proposed waiting period is observed. The data from the present study can be used by regulatory bodies in establishing maximum residue limits.
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Affiliation(s)
- Nitesh S Litoriya
- Pesticide Residue Laboratory, AINP on Pesticide Residues, Anand Agricultural University, Anand, India
| | - Ravi L Kalasariya
- Pesticide Residue Laboratory, AINP on Pesticide Residues, Anand Agricultural University, Anand, India
| | - Kaushik D Parmar
- Pesticide Residue Laboratory, AINP on Pesticide Residues, Anand Agricultural University, Anand, India
| | - Jignesh H Patel
- Pesticide Residue Laboratory, AINP on Pesticide Residues, Anand Agricultural University, Anand, India
| | - Sunny H Patel
- Pesticide Residue Laboratory, AINP on Pesticide Residues, Anand Agricultural University, Anand, India
| | - Nidhi N Chaudhary
- Pesticide Residue Laboratory, AINP on Pesticide Residues, Anand Agricultural University, Anand, India
| | - Nirmal R Chauhan
- Pesticide Residue Laboratory, AINP on Pesticide Residues, Anand Agricultural University, Anand, India
| | - Suchi Chawla
- Pesticide Residue Laboratory, AINP on Pesticide Residues, Anand Agricultural University, Anand, India
| | - Paresh G Shah
- Pesticide Residue Laboratory, AINP on Pesticide Residues, Anand Agricultural University, Anand, India
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Wang B, Xue Z, Lan J, Sun M, Sun Q, Huang Z, Zhang C, Liu X. Activity of the new OSBP inhibitor Y18501 against Pseudoperonospora cubensis and its application for the control of cucumber downy mildew. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2023; 194:105415. [PMID: 37532305 DOI: 10.1016/j.pestbp.2023.105415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 03/27/2023] [Accepted: 03/29/2023] [Indexed: 08/04/2023]
Abstract
Y18501 is a new oxysterol-binding protein inhibitor (OSBPI) with a similar structure to oxathiapiprolin. Y18501 showed strong inhibitory activities against Phytophthora spp. and Pseudoperonospora cubensis, with EC50 ranging from 0.0005 to 0.0046 μg/mL. It also had good control efficacy on cucumber downy mildew (CDM) in the green house and in the field, and could effectively inhibit different development stages of P. cubensis, especially for sporangiophore production, sporangial production, mycelium extension, and elongation of germ tube. In addition, Y18501 showed excellent protective and curative activities against P. cubensis. It also had acropetal systemic mobility in the cucumber leaves, and could be taken up and translocated to the upper leaves more effectively from the lower leaves than from the roots. Y18501 had poorer permeability in cucumber leaves compared to oxathiapiprolin. The simultaneous application of Y18501 and chlorothalonil could significantly promote the inhibition of P. cubensis.
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Affiliation(s)
- Bin Wang
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, 2 Yuanmingyuan Road, Beijing 100193, China; State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Co. Ltd, 8 Shenliao East Road, Shenyang 110021, Liaoning, China
| | - Zhaolin Xue
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, 2 Yuanmingyuan Road, Beijing 100193, China
| | - Jie Lan
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Co. Ltd, 8 Shenliao East Road, Shenyang 110021, Liaoning, China
| | - Mingyou Sun
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Co. Ltd, 8 Shenliao East Road, Shenyang 110021, Liaoning, China
| | - Qin Sun
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Co. Ltd, 8 Shenliao East Road, Shenyang 110021, Liaoning, China
| | - Zhongqiao Huang
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, 2 Yuanmingyuan Road, Beijing 100193, China
| | - Can Zhang
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, 2 Yuanmingyuan Road, Beijing 100193, China.
| | - Xili Liu
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, 2 Yuanmingyuan Road, Beijing 100193, China; State Key Laboratory of Crop Stress Biology for Arid Arears, College of Plant Protection, Northwest A&F University, 3 Taicheng Road, Yangling 712100, Shaanxi, China.
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Chen Y, Zhang S, Tian Y, Huang X, Zhou L, Liu S, Chen G, Che Z. Synthesis, Anti-Oomycete and Anti-fungal Activities of Novel Cinchona Alkaloid Derivatives Containing Sulfonate Moiety. Chem Biodivers 2023; 20:e202300607. [PMID: 37334925 DOI: 10.1002/cbdv.202300607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 06/06/2023] [Accepted: 06/06/2023] [Indexed: 06/21/2023]
Abstract
Using cinchona alkaloid as the lead compound, twenty-four cinchona alkaloid sulfonate derivatives (1 a-l, 2 a-c, 3 a-c, 4 a-c, and 5 a-c) were designed and prepared by modifying their C9 position, and structurally confirmed by 1 H-NMR, 13 C-NMR, HR-MS and melting points. Moreover, the stereochemical configurations of compounds 1 f and 1 l were unambiguously confirmed by single-crystal X-ray diffraction. Furthermore, we determined the anti-oomycete and anti-fungal activities of these target compounds against Phytophthora capsici and Fusarium graminearum in vitro. The results showed that two compounds 4 b and 4 c exhibited prominent anti-oomycete activity, and the median effective concentration (EC50 ) values of 4 b and 4 c against P. capsici were 22.55 and 16.32 mg/L, respectively. This study suggested that when the C9 position of cinchona alkaloid sulfonate derivatives is in the S configuration and the 6'-position methoxy group is not present, the anti-oomycete activity is superior. In addition, five compounds 1 e, 1 f, 1 k, 3 c and 4 c displayed significant anti-fungal activity, with EC50 values of 43.64, 45.07, 80.18, 48.58 and 41.88 mg/L against F. graminearum, respectively. This result indicates that only when a specific substituent is introduced into the structural framework of the target compound, the corresponding compound exhibits significant inhibitory activity against fungi.
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Affiliation(s)
- Yingwu Chen
- Laboratory of Pesticidal Design & Synthesis, Department of Plant Protection, College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang, 471023, P. R. China
| | - Song Zhang
- Laboratory of Pesticidal Design & Synthesis, Department of Plant Protection, College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang, 471023, P. R. China
| | - Yuee Tian
- Laboratory of Pesticidal Design & Synthesis, Department of Plant Protection, College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang, 471023, P. R. China
| | - Xiaobo Huang
- Laboratory of Pesticidal Design & Synthesis, Department of Plant Protection, College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang, 471023, P. R. China
| | - Lin Zhou
- College of Plant Protection, Henan Agricultural University, Zhengzhou, 450002, China
| | - Shengming Liu
- Laboratory of Pesticidal Design & Synthesis, Department of Plant Protection, College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang, 471023, P. R. China
| | - Genqiang Chen
- Laboratory of Pesticidal Design & Synthesis, Department of Plant Protection, College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang, 471023, P. R. China
| | - Zhiping Che
- Laboratory of Pesticidal Design & Synthesis, Department of Plant Protection, College of Horticulture and Plant Protection, Henan University of Science and Technology, Luoyang, 471023, P. R. China
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Li JL, Yang JF, Zhou LM, Cai M, Huang ZQ, Liu XL, Zhu XL, Yang GF. Design and Synthesis of Novel Oxathiapiprolin Derivatives as Oxysterol Binding Protein Inhibitors and Their Application in Phytopathogenic Oomycetes. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023. [PMID: 37286337 DOI: 10.1021/acs.jafc.3c00990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Oomycetes, particularly those from the genus Phytophthora, are significant threats to global food security and natural ecosystems. Oxathiapiprolin (OXA) is an effective oomycete fungicide that targets an oxysterol binding protein (OSBP), while the binding mechanism of OXA is still unclear, which limits the pesticide design, induced by the low sequence identity of Phytophthora and template models. Herein, we generated the OSBP model of the well-reported Phytophthora capsici using AlphaFold 2 and studied the binding mechanism of OXA. Based on it, a series of OXA analogues were designed. Then, compound 2l, the most potent candidate, was successfully designed and synthesized, showing a control efficiency comparable to that of OXA. Moreover, field trial experiments showed that 2l exhibited nearly the same activity (72.4%) as OXA against cucumber downy mildew at 25 g/ha. The present work indicated that 2l could be used as a leading compound for the discovery of new OSBP fungicides.
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Affiliation(s)
- Jian-Long Li
- National Key Laboratory of Green Pesticide, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Jing-Fang Yang
- National Key Laboratory of Green Pesticide, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Li-Ming Zhou
- National Key Laboratory of Green Pesticide, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Meng Cai
- National Key Laboratory of Green Pesticide, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Zhong-Qiao Huang
- Department of Plant Pathology, China Agricultural University, Beijing 100193, People's Republic of China
| | - Xi-Li Liu
- Department of Plant Pathology, China Agricultural University, Beijing 100193, People's Republic of China
| | - Xiao-Lei Zhu
- National Key Laboratory of Green Pesticide, Central China Normal University, Wuhan 430079, People's Republic of China
| | - Guang-Fu Yang
- National Key Laboratory of Green Pesticide, Central China Normal University, Wuhan 430079, People's Republic of China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, People's Republic of China
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Xue Z, Wang B, Li C, Yang H, Gao X, Sun M, Huang Z, Miao J, Liu X. Resistance Risk Assessment for the New OSBP Inhibitor Y18501 in Pseudoperonospora cubensis and Point Mutations (G705V, L798W, and I812F) in PscORP1 that Confer Resistance. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:4510-4520. [PMID: 36898018 DOI: 10.1021/acs.jafc.3c00188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Y18501 is a new oxysterol-binding protein inhibitor (OSBPI) that shows strong inhibitory activity against Pseudoperonospora cubensis. In this study, the sensitivities of 159 Ps. cubensis isolates to Y18501 were determined, with EC50 values ranging from 0.001 to 11.785 μg/mL, indicating that a Y18501-resistant subpopulation has appeared in the field. Ten Y18501-resistant mutants were obtained by fungicide adaptation and displayed fitness equal to or stronger than their parental isolates, which suggests that the resistance risk of Ps. cubensis to Y18501 is high. The consecutive applications of Y18501 in the field resulted in the rapid resistance of Ps. cubensis and decreased control efficacy of cucumber downy mildew (CDM), which could be alleviated by compounding with mancozeb. A positive cross-resistance was detected between Y18501 and oxathiapiprolin. The amino acid substitutions G705V, L798W, and I812F in PscORP1 conferred resistance to Y18501 in Ps. cubensis, which was validated by molecular docking and molecular dynamics simulations.
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Affiliation(s)
- Zhaolin Xue
- China Agricultural University, Beijing 100193, China
| | - Bin Wang
- China Agricultural University, Beijing 100193, China
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Co. Ltd, Shenyang 110021, China
| | - Chengcheng Li
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling 712110, China
| | - Huixin Yang
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Co. Ltd, Shenyang 110021, China
| | - Xuheng Gao
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling 712110, China
| | - Mingyou Sun
- State Key Laboratory of the Discovery and Development of Novel Pesticide, Shenyang Sinochem Agrochemicals R&D Co. Ltd, Shenyang 110021, China
| | | | - Jianqiang Miao
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling 712110, China
| | - Xili Liu
- China Agricultural University, Beijing 100193, China
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling 712110, China
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Massi F, Torriani SF, Waldner-Zulauf M, Bianco PA, Coatti M, Borsa P, Borghi L, Toffolatti SL. Characterization of Italian Plasmopara viticola populations for resistance to oxathiapiprolin. PEST MANAGEMENT SCIENCE 2023; 79:1243-1250. [PMID: 36433674 DOI: 10.1002/ps.7302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 10/27/2022] [Accepted: 11/26/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND Oxathiapiprolin is a novel fungicide and the first of the piperidinyl-thiazole-isoxazoline class to be discovered. This fungicide has been reported to have high activity against Plasmopara viticola, the grapevine downy mildew agent, and other plant-pathogenic oomycetes. In this study, the baseline sensitivity of Italian P. viticola populations towards oxathiapiprolin was established on 29 samples collected in 10 different viticultural areas. Two insensitive strains were characterized for their mechanism of resistance. RESULTS Oxathiapiprolin exhibited substantial inhibitory activity against 27 of the 29 populations tested, with EC50 values ranging from a minimum of under 4 × 10-5 mg L-1 to over 4 × 10-1 mg L-1 , with an average value of 3.2 × 10-2 mg L-1 . Two stable suspected oxathiapiprolin-resistant mutants were isolated from population exhibiting reduced sensitivity, and sequenced for the oxathiapiprolin target gene PvORP1. The comparison with wild-type isolates revealed that the resistant isolates possessed a heterozygous mutation causing the amino acid substitution N837I, recently reported in the literature. CONCLUSION The results obtained indicate a risk for Italian P. viticola populations to develop resistance to oxathiapiprolin in association with the N837I mutation at PvORP1. Anti-resistance strategies should be carefully implemented and the sensitivity levels to this molecule should be monitored accurately in future to preserve its effectiveness. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Federico Massi
- Dipartimento di Scienze Agrarie e Ambientali, Università degli Studi di Milano, Milan, Italy
| | | | | | - Piero A Bianco
- Dipartimento di Scienze Agrarie e Ambientali, Università degli Studi di Milano, Milan, Italy
| | - Mauro Coatti
- Syngenta Italia Spa, Viale Fulvio Testi, Milan, Italy
| | - Paolo Borsa
- Syngenta Italia Spa, Viale Fulvio Testi, Milan, Italy
| | - Lorenzo Borghi
- Syngenta Crop Protection Münchwilen AG, Basel, Switzerland
| | - Silvia L Toffolatti
- Dipartimento di Scienze Agrarie e Ambientali, Università degli Studi di Milano, Milan, Italy
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Li C, Liu X, Liu Z, Hu S, Xue Z, Fu Y, Miao J, Liu X. Resistance Risk and Novel Resistance-Related Point Mutations in Target Protein PiORP1 of Fluoxapiprolin in Phytophthora infestans. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:4881-4888. [PMID: 35416662 DOI: 10.1021/acs.jafc.1c08199] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Fluoxapiprolin is a new oxysterol binding protein inhibitor (OSBPI), which showed excellent inhibitory activity to plant pathogenic oomycetes. Its resistance risk and mechanism in Phytophthora infestans are unclear. In the current study, the sensitivities of 103 P. infestans isolates to fluoxapiprolin were investigated, and a unimodal distribution with a mean EC50 value of 0.00035 μg/mL was observed. Four types of resistant mutants, with a resistance factor from 14 to more than 1000, and point mutations S768I+N837I, S768I+L860I, S768I, and I877F in PiORP1, were acquired using fungicide adaption. The fitness of the mutants was similar to or lower than that of the corresponding parental isolate. Positive cross-resistance was detected between fluoxapiprolin and oxathiapiprolin. The point mutations were verified in P. sojae homologue positions using the CRISPR/Cas9 genome editing system. Transformants containing S768I+N837I or S768I+L860I, showed high fluoxapiprolin resistance (RF > 1000). In conclusion, the risk of P. infestans resistance to fluoxapiprolin is moderate, and novel point mutation types S768I+N837I or S768I+L860I could cause high fluoxapiprolin resistance in P. infestans.
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Affiliation(s)
- Chengcheng Li
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, 3 Taicheng Road, Yangling 712100, Shaanxi, China
| | - Xiaofei Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, 3 Taicheng Road, Yangling 712100, Shaanxi, China
| | - Zeqi Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, 3 Taicheng Road, Yangling 712100, Shaanxi, China
| | - Shiping Hu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, 3 Taicheng Road, Yangling 712100, Shaanxi, China
| | - Ziwei Xue
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, 3 Taicheng Road, Yangling 712100, Shaanxi, China
| | - Yixin Fu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, 3 Taicheng Road, Yangling 712100, Shaanxi, China
| | - Jianqiang Miao
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, 3 Taicheng Road, Yangling 712100, Shaanxi, China
| | - Xili Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, 3 Taicheng Road, Yangling 712100, Shaanxi, China
- Department of Plant Pathology, College of Plant Protection, China Agricultural University, 2 Yuanmingyuanxi Road, Beijing 100193, China
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Mboup MK, Sweigard JW, Carroll A, Jaworska G, Genet JL. Genetic mechanism, baseline sensitivity and risk of resistance to oxathiapiprolin in oomycetes. PEST MANAGEMENT SCIENCE 2022; 78:905-913. [PMID: 34716648 DOI: 10.1002/ps.6700] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 10/08/2021] [Accepted: 10/29/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Oxathiapiprolin is a piperidinyl thiazole isoxazoline fungicide discovered by DuPont and commercialized by Corteva Agriscience. It acts by inhibiting a novel fungal target, an oxysterol binding protein (OSBP), and is intrinsically highly active against oomycetes including grape downy mildew (Plasmopara viticola) and potato late blight (Phytophthora infestans). Because the fungicide acts at a single site there is a need to determine the risk of resistance development. RESULTS Oxathiapiprolin controlled European Plasmopara viticola and Phytophthora infestans isolates at very low concentrations with half maximal effective concentration (EC50 ) values ranging from 0.001 to 0.0264 mg L-1 and 0.001 to 0.03 mg L-1 , respectively. Laboratory mutagenesis studies performed with Phytophthora capsici using ultraviolet (UV) irradiation generated mutants with reduced sensitivity to oxathiapiprolin. All resistant mutants had a base pair change in the OSBP gene that resulted in an amino acid change. Most common substitutions were S768Y, G770V, G839W and L863W. Isolates of Plasmopara viticola and Phytophthora infestans with reduced sensitivity were also detected in field trial sites where oxathiapiprolin had been applied repeatedly each season over several consecutive years. CONCLUSIONS The risk of oxathiapiprolin resistance development in Plasmopara viticola and Phytophthora infestans is medium to high and strict resistance management measures are required. Over-exposure of target populations to single-site fungicides during product development should be avoided.
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Fluorine-containing agrochemicals in the last decade and approaches for fluorine incorporation. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.07.064] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Cohen Y, Rubin AE, Galperin M. Effective control of two genotypes of Phytophthora infestans in the field by three oxathiapiprolin fungicidal mixtures. PLoS One 2021; 16:e0258280. [PMID: 34624036 PMCID: PMC8500417 DOI: 10.1371/journal.pone.0258280] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 09/22/2021] [Indexed: 12/01/2022] Open
Abstract
In two field experiments, performed in 2020 and 2021, potato Nicola plants were sprayed once with three (Exp. 1) or two (Exp. 2) doses of Zorvec Vinabel (oxathiapiprolin+ zoxamide = ZZ), Zorvec Encantia (oxathiapiprolin+ famoxadone = ZF), Zorvec Endavia (oxathiapiprolin+ benthiavalicarb = ZE), Infinito (= INF) or Mefenoxam (= MFX) and thereafter inoculated with genotype 23A1 or 36A2 of Phytophthora infestans. Disease development was recorded at periodic intervals for a month. In both experiments, Zorvec mixtures were significantly more effective in suppressing the disease than INF or MFX. They delayed the onset of the disease and its progress, regardless the genotype used for inoculation. Among the three Zorvec mixtures, ZZ was least effective and ZE most effective. Sensitivity monitoring assays revealed zero mutants of P. infestans resistant to oxathiapiprolin. The data confirmed good efficacy of Zorvec mixtures, especially ZE, in field-grown potato crops as evident by the very effective control of late blight for one month.
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Affiliation(s)
- Yigal Cohen
- Faculty of Life Sciences, Bar Ilan University, Ramat Gan, Israel
- * E-mail: ,
| | - Avia E. Rubin
- Faculty of Life Sciences, Bar Ilan University, Ramat Gan, Israel
| | - Mariana Galperin
- Faculty of Life Sciences, Bar Ilan University, Ramat Gan, Israel
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