Weed Technology最新文献

{"title":"Evaluation of herbicide programs for the control of knotroot foxtail [Setaria parviflora (Poir.) Kerguélen] in bermudagrass pasture","authors":"Logan M. Dyer, Gerald M. Henry, Patrick E. McCullough, Jason Belcher, Nicholas T. Basinger","doi":"10.1017/wet.2023.98","DOIUrl":"https://doi.org/10.1017/wet.2023.98","url":null,"abstract":"Knotroot foxtail has become more prevalent and problematic in pastures and hayfields in the southeastern United States. There are currently gaps in herbicide programs for the management of this species in bermudagrass forage production. This study was conducted to determine the efficacy of programmatic approaches to control knotroot foxtail in bermudagrass with fall postemergence (POST) herbicide applications, with and without spring preemergence (PRE) herbicide applications. The study was a randomized complete block with a factorial arrangement of treatments and included a non-treated control for both fall and spring timings. Glyphosate at two rates (0.35 or 0.7 kg ae ha<jats:sup>-1</jats:sup>), nicosulfuron (0.07 kg ai ha<jats:sup>-1</jats:sup>) + metsulfuron (0.012 kg ai ha<jats:sup>-1</jats:sup>), and hexazinone (1.3 kg ai ha<jats:sup>-1</jats:sup>) were applied alone in the fall or followed by indaziflam (0.067 kg ai ha<jats:sup>-1</jats:sup>) or pendimethalin (4.46 kg ai ha<jats:sup>-1</jats:sup>) in the spring. Three harvests were conducted throughout the growing season to evaluate weed species (knotroot foxtail, large crabgrass, and horsenettle) and bermudagrass biomass as well as overall species composition. The combination of fall and spring treatments did not affect weed species or bermudagrass biomass. Therefore, treatment main effects were analyzed by fall or spring application timing. A spring application of either pendimethalin or indaziflam increased bermudagrass biomass when compared to the non-treated control. However, neither PRE herbicide effectively reduced knotroot foxtail biomass when compared to the non-treated control. Although, pendimethalin did reduce season-long knotroot foxtail composition. Spring PRE herbicides are an effective tool for forage producers, but further research is needed to identify effective herbicides and additional approaches for the control of knotroot foxtail.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of carrier water pH and hardness on imazapic efficacy for sicklepod (Senna obtusifolia L.) control in peanut","authors":"Olumide S. Daramola, Gregory E. MacDonald, Ramdas G. Kanissery, Barry L. Tillman, Hardeep Singh, Pratap Devkota","doi":"10.1017/wet.2023.96","DOIUrl":"https://doi.org/10.1017/wet.2023.96","url":null,"abstract":"Carrier water quality is an important consideration for herbicide efficacy. Field and greenhouse studies were conducted from 2021 to 2023 to evaluate the effect of carrier water pH and hardness on imazapic efficacy for sicklepod control in peanut. Imazapic was applied postemergence at 0.071 kg a.i ha<jats:sup>-1</jats:sup> with carrier water pH levels (5, 6, 7, 8 or 9); and hardness levels: 0 (deionized water), 100, 200, 400 or 500 mg L<jats:sup>−1</jats:sup> of CaCO<jats:sub>3</jats:sub> equivalent in separate field experiments. In greenhouse experiments, imazapic was applied to either 10-cm, 15-cm, or 20-cm-tall sicklepod at similar carrier water pH levels and hardness 0, 100, 200, 400, or 800 mg L<jats:sup>−1</jats:sup> of CaCO<jats:sub>3</jats:sub>. In the field study, sicklepod control, density and biomass reductions were lower with carrier water pH 5 or 9 compared with pH 7. In the greenhouse study, control was not different among carrier water pH levels when imazapic was applied to 10-cm sicklepod; however, when applied to 15-cm or 20-cm sicklepod, control was at least 25% greater with acidic (pH 5) compared with alkaline (pH 9) carrier water. Results from the field study showed that carrier water hardness ≤500 ppm did not reduce imazapic efficacy for sicklepod control. In the greenhouse study, regardless of sicklepod height, carrier water hardness 800 mg L<jats:sup>-1</jats:sup> reduced sicklepod control by 15% and biomass reduction by 17% compared with deionized water (pH 7). The effects of carrier water pH and hardness on imazapic efficacy did not compromise peanut yield in the field study. However, this study indicates both acidic and alkaline carrier water pH and hardness (800 mg L<jats:sup>-1</jats:sup> CaCO<jats:sub>3</jats:sub> L<jats:sup>-1</jats:sup>) has the potential to reduce imazapic efficacy on sicklepod, and appropriate spray solution amendments maybe be needed to maintain optimum efficacy.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139462461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Phosphorus influence on the critical period of weed control in sweet corn","authors":"Alex G. Rodriguez, Hardev S. Sandhu, Alan L. Wright, D. Calvin Odero","doi":"10.1017/wet.2023.95","DOIUrl":"https://doi.org/10.1017/wet.2023.95","url":null,"abstract":"Understanding the effect of phosphorus (P) fertilization on weed interference with sweet corn is important for deciding appropriate fertilization levels and weed control programs. Field experiments were conducted in 2020 and 2021 in Belle Glade, FL to determine the influence of P fertilization levels (0 or residual P, 62.5, and 120 kg P<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub> ha<jats:sup>-1</jats:sup>) on the critical period of weed control (CPWC) in sweet corn on organic soils. Experimental plots were subjected to increased duration of weed interference and weed-free period treatments for each P fertilization level. The beginning and end of the CPWC based on 5% and 10% acceptable yield loss levels were determined by fitting log-logistic and Gompertz models to represent the increasing duration of weed interference and duration of the weed-free period, respectively. The log-logistic curves did not estimate the beginning of the CPWC at 5% AYL for 0 and 125 kg P<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub> ha<jats:sup>-1</jats:sup> because the estimated upper limits of the curves were lower than the 95% relative yield used for estimation of 5% AYL. Based on 10% AYL level, the length of the CPWC in sweet corn under optimum P fertilization level was estimated to be 27 days, from the six- to seven-leaf stage until the silking stage of growth. Reducing P fertilization by 50% increased the CPWC to 36 days, from the five-leaf stage until the silking to blister stage of growth. Lack of P fertilization increased the CPWC to 64 days, from sweet corn emergence until the blister to milk stage of growth. These results show that the beginning of CPWC in sweet corn is delayed and the end shortened as P fertilization level increases. Therefore, reduction in P fertilization will require a more intensive weed management program for sweet corn because of the prolonged duration of the CPWC.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139052088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Postemergence-directed applications of pendimethalin for control of early-season weeds in chile pepper","authors":"Akash Bajagain, E. Lehnhoff, Robert Steiner, Rebecca Creamer, Brian J. Schutte","doi":"10.1017/wet.2023.91","DOIUrl":"https://doi.org/10.1017/wet.2023.91","url":null,"abstract":"\u0000 In New Mexico chile pepper production, pendimethalin is traditionally applied shortly after crop thinning, which is 9 to 10 wk after crop seeding. Pendimethalin applications before crop thinning may be a method for controlling early-season weeds in chile pepper; however, chile pepper tolerance to early-season applications of pendimethalin is poorly understood. We conducted a greenhouse study to evaluate young chile pepper responses to pendimethalin. We also conducted a field study to determine weed and chile pepper responses to early-season, postemergence-directed (POST-directed) pendimethalin in combination with herbicides registered for preemergence (PRE) applications. The greenhouse study included three treatments administered when chile pepper was at the 4-leaf stage: 1) pendimethalin applied to foliage and soil, 2) pendimethalin applied soil only, and 3) a non-treated control. The field study included four treatments: 1) PRE applications of napropamide followed by POST-directed pendimethalin at 5 wk after crop seeding, 2) PRE applications of clomazone followed by POST-directed pendimethalin at 5 wk after crop seeding, 3) POST-directed pendimethalin without PRE herbicides, and 4) non-treated, weed-free control. We conducted the field study at two sites that differed in soil texture. Pendimethalin application rates were maximum labelled rates for the specific soil. Results from the greenhouse study indicated that pendimethalin applied to foliage and soil stunted two of five cultivars, whereas pendimethalin applied to soil did not affect chile pepper height, fresh weight, dry weight, and root area. Results from the field study indicated POST-directed pendimethalin did not affect chile pepper height or fruit yield, or cause visual symptoms of herbicide injury. POST-directed pendimethalin reduced the densities of weeds, including junglerice. The results of this study indicate that POST-directed applications of pendimethalin at 5 wk after crop seeding do not cause crop injury or yield loss, while providing some weed control benefits, in chile pepper.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138947214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Palmer amaranth (Amaranthus palmeri) control affected by weed size and herbicide spray solution with nozzle type pairings","authors":"K. B. Kouamé, Thomas R. Butts, J. Norsworthy, Jason Davis, L. B. Piveta","doi":"10.1017/wet.2023.92","DOIUrl":"https://doi.org/10.1017/wet.2023.92","url":null,"abstract":"\u0000 Palmer amaranth can grow 4.2 mm in height per degree day; hence, delays of a few days in weed control deployment can result in applications to larger than labeled weeds. Therefore, it is critical to understand the impact of plant size at the time of application in conjunction with herbicide spray solution and nozzle type pairings on the effectiveness of weed management programs in the Enlist E3 and XtendFlex production systems. Field experiments were conducted in 2020, in no-crop conditions, at the Milo J. Shult Agricultural Research & Extension Center in Fayetteville, AR, and the Jackson County Extension Center near Newport, AR, to evaluate the influence of Palmer amaranth size on its control with glufosinate, dicamba, and 2,4-D applied alone and in mixture with specific nozzle pairings as mandated by label requirements. Also, a laboratory experiment was conducted at the Lonoke Extension Center (Lonoke, AR) to evaluate the droplet size and velocity of the spray solutions and nozzles used for the field experiment. A 5- and 10-percentage point reduction in control was observed when applying dicamba (66%) and 2,4-D (63%) alone, respectively compared to each mixed with glufosinate (71% and 73%, respectively). Palmer amaranth density increased to 55, 73, 100, 115, and 140 plants m-2 when 15-, 25-, 41-, 61-, and 76-cm tall plants were sprayed, respectively, compared to when 5-cm tall plants were sprayed (9 plants m-2). Nozzle types did not impact weed control and density. The addition of glufosinate to 2,4-D increased the percentage of driftable fines compared to 2,4-D alone. Effective short- and long-term chemical control of Palmer amaranth will require growers to be timely with their weed management programs, overlay residuals, and expect the need for sequential applications.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138946242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Feral rye (Secale cereale L.) control in quizalofop-resistant winter wheat in Oregon","authors":"Victor H. V. Ribeiro, C. Mallory-Smith, Jennifer A. Gourlie, Chad W. Shelton, Judit Barroso","doi":"10.1017/wet.2023.89","DOIUrl":"https://doi.org/10.1017/wet.2023.89","url":null,"abstract":"\u0000 Managing winter annual grass weeds has long been a challenge in the dryland soft white winter wheat-producing regions of the Pacific Northwest (PNW). The recent development of quizalofop-resistant (CoAXium) wheat varieties allows growers to use the acetyl-CoA carboxylase (ACCase)-inhibiting herbicide quizalofop (QP) for postemergence grass control. Field experiments were conducted over two winter wheat growing seasons in 2021-2022 and 2022-2023 near Adams, OR, to evaluate QP efficacy on feral rye and for crop safety. Downy brome and jointed goatgrass control with QP were assessed in 2021-2022 and 2022-2023, respectively. Quizalofop treatments provided effective feral rye (≥ 95%), downy brome (≥ 87%), and jointed goatgrass (99%) control regardless of rates, adjuvants, and spray volumes tested. Spring-applied QP caused no winter wheat injury. Results indicate that the quizalofop-resistant wheat technology can help PNW wheat growers selectively control winter annual grasses.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138949109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Very long chain fatty acid-inhibiting herbicides: Current uses, site of action, herbicide-resistant weeds, and future","authors":"Amit J. Jhala, Mandeep Singh, Lovreet S. Shergill, Rishabh Singh, M. Jugulam, D. Riechers, Z. A. Ganie, Thomas P. Selby, Rodrigo Werle, J. Norsworthy","doi":"10.1017/wet.2023.90","DOIUrl":"https://doi.org/10.1017/wet.2023.90","url":null,"abstract":"\u0000 The herbicides that inhibit very long chain fatty acid (VLCFA) elongases are primarily used for residual weed control in corn, barley, oat, sorghum, soybean, sugarcane, certain vegetable crops, and wheat production fields in the United States. They act primarily by inhibiting shoot development of susceptible species, preventing weed emergence and growth. The objectives of this review were to summarize (1) the chemical family of VLCFA-inhibiting herbicides and their use in the United States, (2) the VLCFA biosynthesis in plants and their site of action, (3) VLCFA-inhibitor resistant weeds and their mechanism of resistance, and (4) the future of VLCFA-inhibiting herbicides. After their re-classification as group 15 herbicides to include shoot growth-inhibiting herbicides (group 8), the VLCFA-inhibiting herbicides are currently represented by eight chemical families (benzofurans, thiocarbamates, α-chloroacetamides, α-oxyacetamides, azolyl-carboxamides, isoxazolines, α-thioacetamides, and oxiranes). On average, VLCFA-inhibiting herbicides are applied once a year in both corn and soybean in the United States with acetochlor and S-metolachlor being the most-used VLCFA-inhibiting herbicides in corn and soybean, respectively. The site of action of group 15 herbicides results from inhibition of the VLCFA synthase, encoded by several fatty acid elongase (FAE1)-like genes in VLCFA elongase complex in an endoplasmic reticulum. The VLCFA synthase is a condensing enzyme, and relies on a conserved, reactive cysteinyl sulfur in active site that performs a nucleophilic attack on either the natural substrate (fatty acyl-CoA) or the herbicide. As of August 2023, 13 weed species have been documented resistant to VLCFA-inhibitor, including 11 monocot weeds and two dicot weeds (Palmer amaranth and waterhemp). The isoxazolines (pyroxasulfone and fenoxasulfone) are the most recently (2014) discovered VLCFA-inhibiting herbicides. Although the intensity of VLCFA-inhibitor-directed discovery efforts has decreased over the past decade, this biochemical pathway remains a viable mechanistic target for the discovery and valuable component of herbicide premixes.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138949854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Response of Cotton at Different Growth Stages to Imazapyr","authors":"Michael W. Marshall, Mitchell B. Williams, Michael A. Jones","doi":"10.1017/wet.2023.93","DOIUrl":"https://doi.org/10.1017/wet.2023.93","url":null,"abstract":"\u0000 A significant proportion of the forested production area in South Carolina is managed using aerial applications of imazapyr. Cotton injury from off-target movement of imazapyr has been observed in South Carolina. Field experiments were conducted at the Edisto Research and Education Center (EREC) in 2021 and 2022 and at the Pee Dee Research and Education Center (PDREC) in 2022 to evaluate the response of cotton at two growth stages to imazapyr at 0.1, 0.05, 0.025, 0.0125, and 0.00625X of the normal use rate of 0.84 kg ae ha-1. Vegetative cotton injury was 86 and 74% at 0.1 and 0.05X imazapyr rates 28 days after application (DAA). Cotton heights ranged from 23 to 93 cm across all three locations (EREC 2021, EREC 2022, and PDREC 2022). Yields at EREC 2021 were reduced by 79, 48 and 31% at the 0.1, 0.05, and 0.025X rates, respectively. Similar reductions from imazapyr were observed at EREC 2022 and PDREC 2022. Reproductive cotton visual injury 28 DAA ranged from 95 to 64% for the 0.1 to 0.0125X rates, respectively. Reproductive cotton height reductions were 59% of the untreated control 28 DAA at 0.1X rate. Seed cotton yields ranged from 0 to 2880 kg ha-1 across three locations in 2021 and 2022. Seed cotton yield was lowest at the 0.1 to 0.025X imazapyr rates. Cotton exposure to imazapyr at the vegetative and reproductive growth stages resulted in plant injury, height, and yield reductions, especially at the higher rates of imazapyr. The highest reduction in cotton growth and yield was observed after exposure at the reproductive growth stage across the imazapyr rates. In summary, the magnitude of cotton response to imazapyr depends on crop growth stage and imazapyr concentration at the time of exposure with the greatest impact occurring at the reproductive growth stage.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138948244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Reduced irrigation impact on soil-applied herbicide dissipation and rotational crop response","authors":"Daniel M. Adamson, Gustavo M. Sbatella, Andrew R. Kniss, Franck E. Dayan","doi":"10.1017/wet.2023.85","DOIUrl":"https://doi.org/10.1017/wet.2023.85","url":null,"abstract":"Soil-applied herbicides are important for controlling weeds in many crops but risk damage to susceptible rotational crops if they persist. Field studies were conducted in Powell, Wyoming from 2015 through 2017 to evaluate the effect of reduced water availability on soil-applied herbicide dissipation. Eight soil-applied herbicides, applied to dry bean or corn, were exposed to three season-long irrigation treatments (100, 85, and 70% of estimated crop evapotranspiration [ETc]) by overhead sprinkler. Soil samples were collected to a depth of 10 cm from 0 to 140 d after application, and soil herbicide concentrations were quantified using gas or liquid chromatography and mass spectrometry. Herbicide concentrations were regressed over time to produce a soil half-life estimate for each herbicide and irrigation treatment. Reduced irrigation decreased dry bean yield by up to 77%, and corn yield by up to 50%. After adjusting for precipitation, the lowest irrigation treatment received 78% as much water as the full irrigation treatment in 2015 and 76% in 2016. This significantly increased the soil half-life of imazethapyr, but did not increase the soil half-life of atrazine, pyroxasulfone, saflufenacil, ethalfluralin, trifluralin, or pendimethalin. Reduced irrigation did not increase carryover injury to rotational crops from these herbicides one year after application. Instead, carryover response was determined by the inherent persistence of individual herbicides. Imazethapyr (0.1 kg ai ha<jats:sup>-1</jats:sup>) injured rotational sugar beet, and isoxaflutole (0.1 kg ai ha<jats:sup>-1</jats:sup>) injured rotational dry bean. Pyroxasulfone (0.2 kg ai ha<jats:sup>-1</jats:sup>), atrazine (2.0 kg ai ha<jats:sup>-1</jats:sup>), saflufenacil (0.1 kg ai ha<jats:sup>-1</jats:sup>) + dimethenamid-P (0.6 kg ai ha<jats:sup>-1</jats:sup>), ethalfluralin (0.8 kg ai ha<jats:sup>-1</jats:sup>), trifluralin (0.6 kg ai ha<jats:sup>-1</jats:sup>), and pendimethalin (1.1 kg ai ha<jats:sup>-1</jats:sup>) did not injure rotational crops regardless of irrigation treatment. Drought stress sufficient to cause up to 77% crop yield loss did not increase soil-applied herbicide carryover.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138538833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Echinochloa crus-galli seedlings surviving florpyrauxifen-benzyl applications have a greater potential to produce resistant seeds","authors":"Guoqi Chen, Xiangxin Zhuang, Aatiqa Masoom, Yang Chen, Yunhua Gu, Jiahao Zhang","doi":"10.1017/wet.2023.87","DOIUrl":"https://doi.org/10.1017/wet.2023.87","url":null,"abstract":": Florpyrauxifen-benzyl (FPB) is an important postemergence rice herbicide. This study tested the potential for seed production in an FPB-resistant barnyardgrass population. A barnyardgrass population (NL) collected from a rice field in eastern China was highly resistant to FPB with a GR<jats:sub>50</jats:sub> dose (the FPB dose causing a 50% reduction in fresh weight of aboveground parts) of 50.2 g ai ha<jats:sup>−1</jats:sup>. No significant differences in the percentages of surviving seedlings after treatment with different doses of the herbicide were found between F<jats:sub>1</jats:sub> lines collected from F<jats:sub>0</jats:sub> plants surviving a 36 g ai ha<jats:sup>−1</jats:sup> FPB treatment and those collected from non-treated control F<jats:sub>0</jats:sub> plants. Additionally, no significant differences were found in the rate of surviving seedlings after treatment with varying doses of FPB among the F<jats:sub>2</jats:sub> lines collected from F<jats:sub>1</jats:sub> plants that survived varying doses of FPB. At a constant temperature of 30 C, seeds from different F<jats:sub>1</jats:sub> and F<jats:sub>2</jats:sub> lines showed germination percentages of 85%‒92.0% and 68.3%‒89.0%, respectively. In the absence of competition, plants from the NL population surviving 0–144 g ai ha<jats:sup>−1</jats:sup> FPB showed no significant differences in plant height, dry weight of aboveground parts, effective accumulated temperature (EAT) from sowing to seed maturation, seed production per plant, or 1000-seed weight. In the susceptible population (HJ), plants surviving 18 g ai ha<jats:sup>−1</jats:sup> FPB showed no significant differences compared to the non-treated control plants of the same population for the above variables. This is the first report of FPB-resistant barnyardgrass in China. Barnyardgrass seedlings that survived FPB application showed a higher potential for accumulating in the soil seedbank and negatively affecting rice.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138538799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}