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Dicamba Air Concentrations in Eastern Arkansas and Impact on Soybean 阿肯色州东部麦草畏空气浓度及其对大豆的影响
IF 2.5 2区 农林科学
Weed Science Pub Date : 2023-04-28 DOI: 10.1017/wsc.2023.22
M. L. Zaccaro-Gruener, J. Norsworthy, Chad B. Brabham, L. Barber, T. Roberts, A. Mauromoustakos, T. Mueller
{"title":"Dicamba Air Concentrations in Eastern Arkansas and Impact on Soybean","authors":"M. L. Zaccaro-Gruener, J. Norsworthy, Chad B. Brabham, L. Barber, T. Roberts, A. Mauromoustakos, T. Mueller","doi":"10.1017/wsc.2023.22","DOIUrl":"https://doi.org/10.1017/wsc.2023.22","url":null,"abstract":"Abstract Damage to non–dicamba resistant (non-DR) soybean [Glycine max (L.) Merr.] has been frequent in geographies where dicamba-resistant (DR) soybean and cotton (Gossypium hirsutum L.) have been grown and sprayed with the herbicide in recent years. Off-target movement field trials were conducted in northwest Arkansas to determine the relationship between dicamba concentration in the air and the extent of symptomology on non-DR soybean. Additionally, the frequency and concentration of dicamba in air samples at two locations in eastern Arkansas and environmental conditions that impacted the detection of the herbicide in air samples were evaluated. Treatment applications included dicamba at 560 g ae ha–1 (1X rate), glyphosate at 860 g ae ha–1, and particle drift retardant at 1% v/v applied to 0.37-ha fields with varying degrees of vegetation. The relationship between dicamba concentration in air samples and non-DR soybean response to the herbicide was more predictive with visible injury (generalized R2 = 0.82) than height reduction (generalized R2 = 0.43). The predicted dicamba air concentration resulting in 10% injury to soybean was 1.60 ng m–3 d–1 for a single exposure. The predicted concentration from a single exposure to dicamba resulting in a 10% height reduction was 3.78 ng m–3 d–1. Dicamba was frequently detected in eastern Arkansas, and daily detections above 1.60 ng m–3 occurred 17 times in the period sampled. The maximum concentration of dicamba recorded was 7.96 ng m–3 d–1, while dicamba concentrations at Marianna and Keiser, AR, were ≥1 ng m–3 d–1 in six samples collected in 2020 and 22 samples in 2021. Dicamba was detected consistently in air samples collected, indicating high usage in the region and the potential for soybean damage over an extended period. More research is needed to quantify the plant absorption rate of volatile dicamba and to evaluate the impact of multiple exposures of gaseous dicamba on non-targeted plant species.","PeriodicalId":23688,"journal":{"name":"Weed Science","volume":"71 1","pages":"265 - 277"},"PeriodicalIF":2.5,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45601469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Molecular Mechanism of Resistance to Mesosulfuron-Methyl in Shortawn Foxtail (Alopecurus aequalis) from China 中国短芒狐尾(Alopecurus aequalis)对甲磺隆抗性的分子机制
IF 2.5 2区 农林科学
Weed Science Pub Date : 2023-04-20 DOI: 10.1017/wsc.2023.23
Zhi Tang, Z. Wang, Maling Wang, F. Yin, Min Liao, Haiqun Cao, Ning Zhao
{"title":"Molecular Mechanism of Resistance to Mesosulfuron-Methyl in Shortawn Foxtail (Alopecurus aequalis) from China","authors":"Zhi Tang, Z. Wang, Maling Wang, F. Yin, Min Liao, Haiqun Cao, Ning Zhao","doi":"10.1017/wsc.2023.23","DOIUrl":"https://doi.org/10.1017/wsc.2023.23","url":null,"abstract":"Abstract Shortawn foxtail (Alopecurus aequalis Sobol.) is an obligate wetland plant that is widely distributed throughout Europe, temperate Asia, and North America. In China, it is widespread in the middle and lower reaches of the Yangtze River as a noxious weed in winter cropping fields with a rice (Oryza sativa L.) rotation. The acetolactate synthase (ALS)-inhibiting herbicide mesosulfuron-methyl has been widely used to control annual grass and broadleaf weeds, including A. aequalis, in wheat (Triticum aestivum L.) fields, leading to the selection of herbicide-resistant weeds. In this study, an A. aequalis population, AHFT-4, that survived mesosulfuron-methyl at the field-recommended rate (9 g ai ha–1) was collected in Anhui Province. Single-dose testing confirmed that the suspected resistant AHFT-4 had evolved resistance to mesosulfuron-methyl. Target gene sequencing revealed a resistance mutation of Pro-197-Ala in ALS1 of the resistant plants, and a derived cleaved amplified polymorphic sequence marker was developed to specifically detect the mutation. A relative expression assay showed no significant difference in ALS expression between AHFT-4 and a susceptible population without or with mesosulfuron-methyl treatment. Whole-plant dose–response bioassays indicated that AHFT-4 had evolved broad-spectrum cross-resistance to ALS-inhibiting herbicides of all five chemical families tested, with GR50 resistance index (RI) values ranging from 21 to 206. However, it remained susceptible to the photosystem II inhibitor isoproturon. Pretreatment with the cytochrome P450 inhibitor malathion or the glutathione S-transferase inhibitor 4-chloro-7-nitrobenzoxa-diazole had no significant effects on the resistance of AHFT-4 to mesosulfuron-methyl. To our knowledge, this study reports for the first time the ALS gene Pro-197-Ala substitution conferring broad-spectrum cross-resistance to ALS-inhibiting herbicides in A. aequalis.","PeriodicalId":23688,"journal":{"name":"Weed Science","volume":"71 1","pages":"224 - 232"},"PeriodicalIF":2.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43552706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of Temperature and Heat Units on Zoysiagrass Response to Herbicides During Post-Dormancy Transition 温度和热量单位对结缕草休眠后对除草剂反应的影响
IF 2.5 2区 农林科学
Weed Science Pub Date : 2023-04-20 DOI: 10.1017/wsc.2023.20
J. M. Craft, Navdeep Godara, Jonathan R. Brewer, S. Askew
{"title":"Effect of Temperature and Heat Units on Zoysiagrass Response to Herbicides During Post-Dormancy Transition","authors":"J. M. Craft, Navdeep Godara, Jonathan R. Brewer, S. Askew","doi":"10.1017/wsc.2023.20","DOIUrl":"https://doi.org/10.1017/wsc.2023.20","url":null,"abstract":"Abstract In the transition zone, turfgrass managers generally utilize the dormancy period of warm-season turfgrass to apply herbicides for managing winter annual weeds. Although this weed control strategy is common in bermudagrass [Cynodon dactylon (L.) Pers.], it has been less adopted in zoysiagrass (Zoysia spp.) due to variable turfgrass injury during post-dormancy transition. Previous research reported that air temperature could affect weed control and crop safety from herbicides. Growth-chamber studies were conducted to evaluate zoysiagrass response to glyphosate and glufosinate as influenced by three different temperature regimes during and after treatment. A field research study was conducted at four site-years to assess the influence of variable heat-unit accumulation on zoysiagrass response to seven herbicides. In the growth-chamber study, glufosinate injured zoysiagrass more than glyphosate and reduced time to reach 50% green cover reduction, regardless of the rate, when incubated for 7 d under different temperature levels. When green zoysiagrass sprigs were incubated for 7 d at 10 C, the rate of green cover reduction was slowed for both herbicides; however, green cover was rapidly reduced under 27 C. After treated zoysiagrass plugs having 5% green cover were incubated at 10 C for 14 d, glyphosate-treated plugs reached 50% green cover in 22 d, similar to nontreated plugs but less than the 70 d required for glufosinate-treated plugs. Zoysiagrass response to glyphosate was temperature dependent, but glufosinate injured zoysiagrass unacceptably regardless of temperature regime. Diquat, flumioxazin, glufosinate, and metsulfuron + rimsulfuron injured zoysiagrass at 200 or 300 growing-degree days at base 5 C (GDD5C) application timings, but foramsulfuron and oxadiazon did not injure zoysiagrass regardless of GDD5C. The relationship of leaf density to green turf cover is dependent on zoysiagrass mowing height, and both metrics are reduced by injurious herbicides. Research indicates that glufosinate injures zoysiagrass more than glyphosate, and the speed and magnitude of herbicide injury generally increase with temperature.","PeriodicalId":23688,"journal":{"name":"Weed Science","volume":"71 1","pages":"233 - 243"},"PeriodicalIF":2.5,"publicationDate":"2023-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49616996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Do Cover Crops Suppress Weeds in the U.S. Southeast? A Meta-Analysis 覆盖作物能抑制美国东南部的杂草吗?一个荟萃分析
IF 2.5 2区 农林科学
Weed Science Pub Date : 2023-04-18 DOI: 10.1017/wsc.2023.21
David A. Weisberger, L. Bastos, V. Sykes, Nicholas T. Basinger
{"title":"Do Cover Crops Suppress Weeds in the U.S. Southeast? A Meta-Analysis","authors":"David A. Weisberger, L. Bastos, V. Sykes, Nicholas T. Basinger","doi":"10.1017/wsc.2023.21","DOIUrl":"https://doi.org/10.1017/wsc.2023.21","url":null,"abstract":"Abstract Cover crops (CCs) have shown great potential for suppressing annual weeds within agronomic cropping systems across the United States. However, the weed suppressive potential of CCs may be moderated by environmental and management factors that are specific to certain geographic areas and their associated characteristics. This may be particularly true within the U.S. Southeast, where higher mean annual temperature and precipitation generate favorable conditions for both CC and weed growth. To understand the effects of this regional context on CCs and weeds, a meta-analysis examining paired comparisons of weed biomass and/or weed density under CC and bare ground conditions from studies conducted within the Southeast was conducted. Data were identified and extracted from 28 journal articles in which weed biomass and/or weed density were measured along with cash crop yield data, if they were provided. Fourteen studies provided 142 comparisons for weed biomass; 23 studies provided 139 comparisons for weed density; and 22 studies, pooled over both weed response variables, provided 144 comparisons for cash crop yield. CCs had a negative effect on weed density (P = 0.0016) but no effect on either weed biomass (P = 0.16) or cash crop yield (P = 0.88). The mean relative reduction in weed density under CCs was 44%. Subsequent analyses indicated that CC biomass was the key factor associated with this reduction. Weed density suppression was linearly related to CC biomass; a 50% decrease in weed density was associated with 6,600 kg ha–1 of CC biomass. Edaphic, geographic, and other management factors had no bearing on this suppressive effect. This highlights the importance of generating adequate CC biomass if weed suppression is the primary objective of CC use and the potential for CCs to reduce weed density over diverse soil, climate, and farm management conditions.","PeriodicalId":23688,"journal":{"name":"Weed Science","volume":"71 1","pages":"244 - 254"},"PeriodicalIF":2.5,"publicationDate":"2023-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47086515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Goosegrass (Eleusine indica) Resistant to Multiple Herbicide Modes of Action in Brazil 巴西鹅草(Eleusine indica)对多种除草剂的抗性
IF 2.5 2区 农林科学
Weed Science Pub Date : 2023-04-13 DOI: 10.1017/wsc.2023.18
Lucas da Silva Araújo, N. M. Correia, V. L. Tornisielo, Mônica Teresa Veneziano Labate, S. Tsai, C. A. Carbonari, R. V. Filho
{"title":"Goosegrass (Eleusine indica) Resistant to Multiple Herbicide Modes of Action in Brazil","authors":"Lucas da Silva Araújo, N. M. Correia, V. L. Tornisielo, Mônica Teresa Veneziano Labate, S. Tsai, C. A. Carbonari, R. V. Filho","doi":"10.1017/wsc.2023.18","DOIUrl":"https://doi.org/10.1017/wsc.2023.18","url":null,"abstract":"Abstract This study was developed based on a goosegrass [Eleusine indica (L.) Gaertn.] population from Primavera do Leste, MT, Brazil, with resistance to multiple herbicide modes of action (5-enol-pyruvylshikimate-3-phosphate synthase [EPSPS] inhibition: glyphosate; acetyl-coenzyme A carboxylase [ACCase] inhibition: aryloxyphenoxypropionate chemical group). The objective was to identify possible mechanisms of resistance associated or not with herbicide sites of action. Several experiments and analyses were carried out with the contribution of different laboratories and institutions. The results obtained allowed us to conclude that: (1) the Asp-2078-Gly mutation conferred resistance to ACCase inhibitors, without overexpression of ACCase or changes in herbicide absorption and translocation; (2) overexpression of EPSPS, Thr-102 and Pro-106 mutations, and changes in absorption and translocation are not involved in E. indica resistance to glyphosate; (3) the metabolism of glyphosate in resistant E. indica plants requires further studies to elucidate the final destination of this herbicide in these plants. The mechanism of resistance of E. indica biotypes to ACCase-inhibiting herbicides was elucidated: it involves a change in the action site. However, the mechanism of resistance to EPSPS inhibitors was not conclusive, indicating that some hypotheses, mainly those regarding the metabolism of glyphosate in resistant plants, require further testing.","PeriodicalId":23688,"journal":{"name":"Weed Science","volume":"71 1","pages":"189 - 197"},"PeriodicalIF":2.5,"publicationDate":"2023-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45132584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Discovery, Mode of Action, Resistance Mechanisms, and Plan of Action for Sustainable Use of Group 14 Herbicides 第14类除草剂的发现、行动方式、抗性机制和可持续利用行动计划
IF 2.5 2区 农林科学
Weed Science Pub Date : 2023-03-29 DOI: 10.1017/wsc.2023.15
Abigail L. Barker, J. Pawlak, S. Duke, R. Beffa, P. Tranel, Joe Wuerffel, B. Young, Aimone Porri, R. Liebl, R. Aponte, D. Findley, Michael Betz, J. Lerchl, S. Culpepper, K. Bradley, F. Dayan
{"title":"Discovery, Mode of Action, Resistance Mechanisms, and Plan of Action for Sustainable Use of Group 14 Herbicides","authors":"Abigail L. Barker, J. Pawlak, S. Duke, R. Beffa, P. Tranel, Joe Wuerffel, B. Young, Aimone Porri, R. Liebl, R. Aponte, D. Findley, Michael Betz, J. Lerchl, S. Culpepper, K. Bradley, F. Dayan","doi":"10.1017/wsc.2023.15","DOIUrl":"https://doi.org/10.1017/wsc.2023.15","url":null,"abstract":"Abstract Protoporphyrinogen oxidase (PPO)-inhibiting herbicides remain an important and useful chemistry 60 yr after their first introduction. In this review, based on topics introduced at the Weed Science Society of America 2021 symposium titled “A History, Overview, and Plan of Action on PPO Inhibiting Herbicides,” we discuss the current state of PPO-inhibiting herbicides. Renewed interest in the PPO-inhibiting herbicides in recent years, due to increased use and increased cases of resistance, has led to refinements in knowledge regarding the mechanism of action of PPO inhibitors. Herein we discuss the importance of the two isoforms of PPO in plants, compile a current knowledge of target-site resistance mechanisms, examine non–target site resistance cases, and review crop selectivity mechanisms. Consistent and reproducible greenhouse screening and target-site mutation assays are necessary to effectively study and compare PPO-inhibitor resistance cases. To this end, we cover best practices in screening to accurately identify resistance ratios and properly interpret common screens for point mutations. The future of effective and sustainable PPO-inhibitor use relies on development of new chemistries that maintain activity on resistant biotypes and the promotion of responsible stewardship of PPO inhibitors both new and old. We present the biorational design of the new PPO inhibitor trifludimoxazin to highlight the future of PPO-inhibitor development and discuss the elements of sustainable weed control programs using PPO inhibitors, as well as how responsible stewardship can be incentivized. The sustained use of PPO inhibitors in future agriculture relies on the effective and timely communication from mode of action and resistance research to agronomists, Extension workers, and farmers.","PeriodicalId":23688,"journal":{"name":"Weed Science","volume":"71 1","pages":"173 - 188"},"PeriodicalIF":2.5,"publicationDate":"2023-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47393541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
WSC volume 71 issue 2 Cover and Front matter WSC第71卷第2期封面和封面问题
IF 2.5 2区 农林科学
Weed Science Pub Date : 2023-03-01 DOI: 10.1017/wsc.2023.16
{"title":"WSC volume 71 issue 2 Cover and Front matter","authors":"","doi":"10.1017/wsc.2023.16","DOIUrl":"https://doi.org/10.1017/wsc.2023.16","url":null,"abstract":"","PeriodicalId":23688,"journal":{"name":"Weed Science","volume":" ","pages":"f1 - f3"},"PeriodicalIF":2.5,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43882718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multi-Tactic Strategies to Manage Herbicide-Resistant Waterhemp (Amaranthus tuberculatus) in Corn–Soybean Rotations of the U.S. Midwest 美国中西部玉米-大豆轮作中抗除草剂水麻(Amaranthus tuberculatus)管理的多策略策略
IF 2.5 2区 农林科学
Weed Science Pub Date : 2023-03-01 DOI: 10.1017/wsc.2023.10
R. Yadav, P. Jha, R. Hartzler, M. Liebman
{"title":"Multi-Tactic Strategies to Manage Herbicide-Resistant Waterhemp (Amaranthus tuberculatus) in Corn–Soybean Rotations of the U.S. Midwest","authors":"R. Yadav, P. Jha, R. Hartzler, M. Liebman","doi":"10.1017/wsc.2023.10","DOIUrl":"https://doi.org/10.1017/wsc.2023.10","url":null,"abstract":"Abstract Field experiments were conducted over 2 yr (2019 to 2020) at two locations in Iowa to evaluate multi-tactic strategies for managing multiple herbicide–resistant (MHR) waterhemp [Amaranthus tuberculatus (Moq.) Sauer] in a corn (Zea mays L.)–soybean [Glycine max (L.) Merr.] rotation. The effect of three herbicide programs on A. tuberculatus control was tested in corn (2019). The effects of the prior year's corn weed control, a cereal rye (Secale cereale L.) cover crop, and soybean row spacing (38-cm vs. 76-cm wide) on A. tuberculatus density, biomass, and seed production were tested in soybean (2020). A herbicide program used in corn with two sites of action provided only 35% control of MHR A. tuberculatus compared with ≥97% control by a herbicide program with three sites of action. In soybean, adequate control of A. tuberculatus (≥90%) in the prior year's corn crop and use of a cover crop or narrow rows reduced A. tuberculatus density by more than 60% at 3 and 9 wk after planting (WAP) compared with inadequate control (30%) in the prior year's corn and no cover crop. Cover crop and narrow-row soybean reduced A. tuberculatus density by 44% at 3 WAP compared with no cover crop and wide-row soybean. Inclusion of a single control tactic, adequate control (≥90%) with multiple herbicides in the prior year's corn, use of a cover crop, or narrow-row soybean reduced A. tuberculatus biomass and seed production at soybean harvest by at least 24% compared with inadequate control (30%) in the prior year's corn, no cover crop, and wide-row soybean. The combination of all three control tactics reduced A. tuberculatus biomass and seed production at soybean harvest by at least 80%. In conclusion, diverse control tactics targeting A. tuberculatus at multiple life-cycle stages can make substantial contributions to the management of MHR populations.","PeriodicalId":23688,"journal":{"name":"Weed Science","volume":"71 1","pages":"141 - 149"},"PeriodicalIF":2.5,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47845476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Effect of Osmotic Potential and Temperature on Germination of Kochia (Bassia scoparia) Populations from the U.S. Great Plains 渗透势和温度对美国大平原地瓜(Bassia scoparia)种群发芽的影响
IF 2.5 2区 农林科学
Weed Science Pub Date : 2023-03-01 DOI: 10.1017/wsc.2023.12
R. Yadav, P. Jha, A. Kniss, Nevin C. Lawrence, Gustavo M. Sbatella
{"title":"Effect of Osmotic Potential and Temperature on Germination of Kochia (Bassia scoparia) Populations from the U.S. Great Plains","authors":"R. Yadav, P. Jha, A. Kniss, Nevin C. Lawrence, Gustavo M. Sbatella","doi":"10.1017/wsc.2023.12","DOIUrl":"https://doi.org/10.1017/wsc.2023.12","url":null,"abstract":"Abstract Development of integrated weed management strategies requires knowledge of weed emergence timing and patterns, which are regulated primarily by water and thermal requirements for seed germination. Laboratory experiments were conducted in fall 2017 to fall 2018 to quantify the effect of osmotic potential and temperature on germination of 44 kochia [Bassia scoparia (L.) A.J. Scott] populations under controlled conditions. Bassia scoparia populations were collected in fall 2016 from northern (near Huntley, MT, and Powell, WY) and southern (near Lingle, WY, and Scottsbluff, NE) regions of the U.S. Great Plains. Ten osmotic potentials from 0 to –2.1 MPa and eight constant temperatures from 4 to 26 C were evaluated. Response of B. scoparia populations to osmotic potential did not differ between the northern and southern regions. At an osmotic potential of 0 MPa, all B. scoparia populations had greater than 98% germination, and the time to achieve 50% germination (t50) was less than 1 d. At –1.6 MPa, 25% of seeds of all B. scoparia populations germinated. Osmotic potentials of –0.85 and –1.9 MPa reduced B. scoparia germination by 10% and 90%, respectively. Regardless of temperature regime, all populations exhibited greater than 88% germination. The germination rate was highest at temperatures between 15 to 26 C and did not differ between populations from northern versus southern regions. At this temperature range, all populations had a t50 of less than 1 d. However, at 4 C, B. scoparia populations from the northern region had a higher germination rate (5 h) and cumulative germination (7%) than populations from the southern region. Overall, these results indicate a wide range of optimum temperatures and osmotic potential requirements for B. scoparia germination.","PeriodicalId":23688,"journal":{"name":"Weed Science","volume":"71 1","pages":"133 - 140"},"PeriodicalIF":2.5,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42151005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Metabolic Cross-Resistance to Florpyrauxifen-Benzyl in Barnyardgrass (Echinochloa crus-galli) Evolved before the Commercialization of Rinskor™ 在Rinskor™商业化之前,稗草(Echinochloa cross -galli)对Florpyrauxifen-Benzyl的代谢性交叉抗性进化
IF 2.5 2区 农林科学
Weed Science Pub Date : 2023-02-27 DOI: 10.1017/wsc.2023.11
H. Takano, Scott A. Greenwalt, D. Ouse, Moriah Zielinski, P. Schmitzer
{"title":"Metabolic Cross-Resistance to Florpyrauxifen-Benzyl in Barnyardgrass (Echinochloa crus-galli) Evolved before the Commercialization of Rinskor™","authors":"H. Takano, Scott A. Greenwalt, D. Ouse, Moriah Zielinski, P. Schmitzer","doi":"10.1017/wsc.2023.11","DOIUrl":"https://doi.org/10.1017/wsc.2023.11","url":null,"abstract":"Abstract Herbicide options for selective control of monocot weeds in rice (Oryza sativa L.) have historically been limited to a few modes of action such as inhibitors of acetolactate synthase (e.g., penoxsulam, imazamox), photosystem II (e.g., propanil), and acetyl-CoA carboxylase (e.g., cyhalofop). Florpyrauxifen-benzyl (Rinskor™) is a synthetic auxin molecule introduced to the U.S. rice herbicide market in 2018, providing broad-spectrum weed control (monocots and dicots), including hard-to-control species such as barnyardgrass [Echinochloa crus-galli (L.) P. Beauv.], along with postemergence rice selectivity at very low use rates. Within the year of commercialization, field agronomists and academics identified E. crus-galli escapes in some areas where florpyrauxifen-benzyl had been sprayed. Further evaluation under controlled environments confirmed that those plants were able to survive florpyrauxifen-benzyl application at the label rate. Here, we identify the mechanism of resistance to florpyrauxifen-benzyl and penoxsulam in two E. crus-galli populations from Arkansas (AR-27) and Missouri (MO-18). Using high-resolution mass spectrometry, we compared the two resistant biotypes with known susceptible plants regarding their ability to metabolize florpyrauxifen-benzyl, florpyrauxifen-acid, and penoxsulam in planta. We discovered that the resistant plants share a common resistance mechanism to florpyrauxifen-benzyl and penoxsulam, involving hydrolysis of a methoxy group (likely mediated by a cytochrome P450 monooxygenase) followed by glucose conjugation. Given that penoxsulam has been widely used in rice fields for the past decade, these data suggest that some populations of E. crus-galli may have evolved resistance before the commercialization of florpyrauxifen-benzyl.","PeriodicalId":23688,"journal":{"name":"Weed Science","volume":"71 1","pages":"77 - 83"},"PeriodicalIF":2.5,"publicationDate":"2023-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48473102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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