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Araldi de Castro R, de Castro SGQ, Quassi de Castro SA, Piassa A, Soares GODN, Tropaldi L, Christofoletti PJ. Optimizing herbicide selection for pre-emergence control of itchgrass and cypressvine morningglory in sugarcane. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2024; 59:350-360. [PMID: 38736380 DOI: 10.1080/03601234.2024.2352321] [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: 02/09/2024] [Accepted: 04/30/2024] [Indexed: 05/14/2024]
Abstract
The aim of this study was to assess the efficacy of herbicides in association to control Rottboellia exaltata and Ipomoea quamoclit during pre-emergence while also to evaluate the potential impact on the sugarcane. The experimental design employed a randomized block with seven treatments and four replications. The treatments were: 1 - no herbicide application; 2 - indaziflam + sulfentrazone; 3 - indaziflam + diclosulam; 4 - indaziflam + tebuthiuron; 5 - flumioxazin + diclosulam, 6 - flumioxazin + pyroxasulfone and 7 - clomazone + sulfentrazone. The evaluated parameters were: percentage of weeds control, green coverage percentage (Canopeo® system), weed biomass (g m-2), itchgrass height, and sugarcane tiller. Several herbicide associations have been proven effective alternatives for managing itchgrass and cypressvine morningglory. The most successful treatments for itchgrass control were indaziflam + tebuthiuron (100%) and indaziflam + diclosulam (97%), whereas for cypressvine morningglory, the betters were indaziflam + sulfentrazone (97%), indaziflam + diclosulam (98%), indaziflam + tebuthiuron (97%), flumioxazin + diclosulam (94%), and clomazone + sulfentrazone (96%). All treatments reduced the weed biomass, with indaziflam + tebuthiuron being the safest option for protecting sugarcane.
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Affiliation(s)
| | | | | | | | | | - Leandro Tropaldi
- Department of Plant Production, College of Agrarian Sciences and Technology, São Paulo State University (UNESP), Dracena, SP, Brazil
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Antiamoebic Properties of Laboratory and Clinically Used Drugs against Naegleria fowleri and Balamuthia mandrillaris. Antibiotics (Basel) 2022; 11:antibiotics11060749. [PMID: 35740156 PMCID: PMC9220410 DOI: 10.3390/antibiotics11060749] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Revised: 05/26/2022] [Accepted: 05/26/2022] [Indexed: 01/11/2023] Open
Abstract
Naegleria fowleri and Balamuthia mandrillaris are pathogenic free-living amoebae that infect the central nervous system with over 95% mortality rates. Although several compounds have shown promise in vitro but associated side effects and/or prolonged approval processes for clinical applications have led to limited success. To overcome this, drug repurposing of marketed compounds with known mechanism of action is considered a viable approach that has potential to expedite discovery and application of anti-amoebic compounds. In fact, many of the drugs currently employed in the treatment of N. fowleri and B. mandrillaris, such as amphotericin B, fluconazole, rifampin and miltefosine, are repurposed drugs. Here, we evaluated a range of clinical and laboratory compounds including metformin, quinclorac, indaziflam, inositol, nateglinide, 2,6-DNBT, trans-cinnamic acid, terbuthylazine, acarbose, glimepiride, vildagliptin, cellulase, thaxtomin A, repaglinide and dimethyl peptidase (IV) inhibitor against N. fowleri and B. mandrillaris. Anti-amoebic assays revealed that indaziflam, nateglinide, 2,6-DNBT, terbuthylazine, acarbose and glimepiride exhibited potent amoebicidal properties against both N. fowleri and B. mandrillaris. Notably, all compounds tested showed minimal human (HaCaT) cell cytotoxicity as determined by lactate dehydrogenase release. Prospective research using animal models is warranted to determine the potential of these repurposed compounds, as well as the need for investigating the intranasal route of delivery to treat these devastating infections.
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Affiliation(s)
- Peter Jeschke
- Bayer AG Research & Development, Crop Science Pest Control Chemistry Alfred-Nobel-Str. 50 40789 Monheim Germany
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Mendes KF, Furtado IF, Sousa RND, Lima ADC, Mielke KC, Brochado MGDS. Cow bonechar decreases indaziflam pre-emergence herbicidal activity in tropical soil. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2021; 56:532-539. [PMID: 33950786 DOI: 10.1080/03601234.2021.1916302] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The addition of carbonaceous material such as cow bonechar to the soil can affect the availability of applied pre-emergent herbicides such as indaziflam. However, how cow bonechar affects the bioavailability of indaziflam is not yet known. The aim of this study was to evaluate the effect of cow bonechar on herbicidal activity of indaziflam on weeds in a tropical soil. Cow bonechar was added homogeneously to top soil, at 1, 2, 5, 10, and 20 t ha-1, in addition to treatment with unamended soil. At 21 days after indaziflam (75 g ha-1) application, injury weed levels, weed species that emerged spontaneously were identified and the weeds present in each sampling unit were collected. Only 1.4 t ha-1 cow bonechar added to soil was enough to reduce the weed injury level by 50%. From the addition of 2 t ha-1 cow bonechar the application of indaziflam was not efficient to weed control, being equivalent to treatments without herbicide application. Eight weed species (3 monocots and 5 dicots) were identified in all treatments. Eleusine indica and Digitaria horizontalis accounted for about 99.7% of the entire infestation of the weed community. Cow bonechar decreases indaziflam pre-emergence herbicidal activity in tropical soil for weed control, most likely due to the high sorption and unavailability of the product in the soil solution.
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Terry TJ, Madsen MD, Gill RA, Anderson VJ, St. Clair SB. Selective herbicide control: using furrows and carbon seed coatings to establish a native bunchgrass while reducing cheatgrass cover. Restor Ecol 2021. [DOI: 10.1111/rec.13351] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Tyson J. Terry
- Department of Plant and Wildlife Sciences Brigham Young University Provo UT United States
| | - Matthew D. Madsen
- Department of Plant and Wildlife Sciences Brigham Young University Provo UT United States
| | - Richard A. Gill
- Department of Biology Brigham Young University Provo UT United States
| | - Val Jo Anderson
- Department of Plant and Wildlife Sciences Brigham Young University Provo UT United States
| | - Samuel B. St. Clair
- Department of Plant and Wildlife Sciences Brigham Young University Provo UT United States
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Eckelmann D, Augustin T, Leake C. Isomeric stability of indaziflam and major degradation products in the environment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 737:140223. [PMID: 32569903 DOI: 10.1016/j.scitotenv.2020.140223] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Revised: 06/12/2020] [Accepted: 06/12/2020] [Indexed: 06/11/2023]
Abstract
Understanding the isomeric behavior of active ingredients in the soil and water environment is the first and a major part of deriving an exposure assessment. Whilst a variety of approaches have been taken previously, with the new regulatory framework for the risk assessment of isomeric plant protection compounds recently published by EFSA, (European Food Safety Authority) there will in future be a more consistent approach which has been taken here. For indaziflam (IAF), the alkylazine, cross spectrum residual herbicide which has a cellulose biosynthesis inhibition mode of action, there was no published data on the isomeric degradation behavior in soil and water. The results of measuring the isomeric stability of [14C]-radiolabeled 437-IAF, the major stereoisomer of indaziflam (AE 1170437, [1R,2S,6R] configuration) during its degradation in an aerobic soil metabolism study with four EU soils, an aerobic aquatic metabolism study with two natural water/sediment test systems, as well as an aqueous photolysis study are reported. To sum up, it was shown that in the different environmental conditions under abiotic as well as biotic degradation processes, indaziflam was not subject to isomeric interconversion to diastereoisomers 435-IAF (RRR), 438-IAF (RSS), or 439-IAF (SSR). Thus, all three chiral centers of indaziflam can be considered isomerically stable. In addition, no isomeric interconversion was observed at the 1-fluoroethyl position for the major degradation products IAF-indanone and IAF-carboxylic acid to the RSS-configuration as well as IAF-diaminotriazine from the R- to the S-configuration.
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Affiliation(s)
- Dennis Eckelmann
- Bayer AG, Crop Science Division, R&D, Environmental Exposure, 40789 Monheim, Germany.
| | - Thomas Augustin
- Bayer AG, Crop Science Division, R&D, Environmental Exposure, 40789 Monheim, Germany
| | - Christopher Leake
- Bayer AG, Crop Science Division, R&D, Environmental Exposure, 40789 Monheim, Germany
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Brosnan JT, Vargas JJ, Spesard B, Netzband D, Zobel JM, Chen J, Patterson EL. Annual bluegrass (Poa annua) resistance to indaziflam applied early-postemergence. PEST MANAGEMENT SCIENCE 2020; 76:2049-2057. [PMID: 31943704 DOI: 10.1002/ps.5740] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 01/02/2020] [Accepted: 01/11/2020] [Indexed: 06/10/2023]
Abstract
BACKGROUND Indaziflam is an alkylazine herbicide used to control annual bluegrass (Poa annua L.). Several locations in the southeastern USA reported poor annual bluegrass control following treatment with indaziflam during autumn 2015. A series of controlled environment experiments were conducted to confirm putative resistance to indaziflam in annual bluegrass collected from these field locations. RESULTS Indaziflam (25 g ha-1 ) effectively controlled all putative-resistant annual bluegrass collections when applied preemergence (PRE), but was ineffective when applied early-postemergence (< 2.5 cm plant height; BBCH scale = 1; EPOST). In agarose-based plate assays, EPOST I50 values for putative-resistant collections ranged from 2424 to 4305 pm compared with 633 pm for the herbicide-susceptible control; therefore, resistance indexes (R/S) ranged from 3.8 to 6.8. Resistant collections were not controlled by foramsulfuron, flumioxazin, glyphosate, glufosinate, metribuzin, pronamide, or simazine applied EPOST. Indaziflam content in herbicide-susceptible annual bluegrass was greater than a resistant collection from 0 to 10 days after treatment (DAT). Susceptibility was not restored when resistant collections were treated with indaziflam plus 1-aminobenzotriazole (10 mg L-1 ), tebuconazole (1510 g ha-1 ), or malathion (400 g ha-1 ). CONCLUSIONS This is a first report of resistance to indaziflam in any plant. Additionally, we confirm that these annual bluegrass collections are resistant to several other herbicidal modes-of-action. It is unclear if this multi-herbicide resistance is due to a single resistance gene, multiple resistance genes, non-target site mechanisms, or a combination thereof. Additional research to better understand resistance mechanisms in these annual bluegrass collections is warranted. © 2020 Society of Chemical Industry.
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Affiliation(s)
- James T Brosnan
- Department of Plant Sciences, University of Tennessee, Knoxville, TN, USA
| | - José J Vargas
- Department of Plant Sciences, University of Tennessee, Knoxville, TN, USA
| | | | | | - John M Zobel
- Department of Forest Resources, University of Minnesota, St. Paul, MN, USA
| | - Jinyi Chen
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, MI, USA
| | - Eric L Patterson
- Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, MI, USA
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Clenet DR, Davies KW, Johnson DD, Kerby JD. Native seeds incorporated into activated carbon pods applied concurrently with indaziflam: a new strategy for restoring annual-invaded communities? Restor Ecol 2019. [DOI: 10.1111/rec.12927] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
| | - Kirk W. Davies
- USDA-Agricultural Research Service, Eastern Oregon Agricultural Research Center; Oregon State University; Burns Oregon U.S.A
| | | | - Jay D. Kerby
- Southeast Oregon Sagebrush Steppe; Nature Conservancy
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Jeschke P. Current status of chirality in agrochemicals. PEST MANAGEMENT SCIENCE 2018; 74:2389-2404. [PMID: 29704299 DOI: 10.1002/ps.5052] [Citation(s) in RCA: 98] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 04/12/2018] [Accepted: 04/23/2018] [Indexed: 06/08/2023]
Abstract
The agrochemical industry is searching continuously for new pesticides to develop products that have optimal efficacy, lower application rates in the field, increased selectivity, favourable toxicological and environmental safety, enhanced user friendliness and better economic viability. One strategy by which to achieve these ambitious goals makes use of the unique properties of molecules containing asymmetric centres. In the past, many natural products and their congeners have been a source of inspiration in the design of new active ingredients, and the molecular structures of the resulting compounds have become increasingly complex; some 30% contain fragments with asymmetric centres. However, despite enormous progress in catalytic asymmetric processes over the past decade, few agrochemicals are produced in an enantiomerically pure or enriched form on an industrial scale. Since 2007, ∼ 43% of the 44 products launched (insecticides, acaricides, fungicides, nematicides and herbicides) contain one or more asymmetric centres in the molecule (∼ 47%) and most have been launched as racemic mixtures of enantiomers or diastereomers. This review provides an overview of the current status of chiral agrochemicals launched over the past 10 years and describes the inherently connected challenges of modern agricultural chemistry by managing important aspects resulting from the stereochemistry of these innovative products. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Peter Jeschke
- Bayer AG, Crop Science Division, Small Molecules Research, Pest Control Chemistry, Monheim am Rhein, Germany
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