Weed Technology最新文献

{"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":"16 8","pages":""},"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":"44 22","pages":""},"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":"28 14","pages":""},"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":"93 1","pages":""},"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":"2 1","pages":""},"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}

{"title":"Peach Tree Response to Low-Dosages of Dicamba as Repeated Applications or with Various Spray Nozzles","authors":"Matthew B. Bertucci, Thomas R. Butts, Koffi Badou-Jeremie Kouame, Jason K. Norsworthy","doi":"10.1017/wet.2023.80","DOIUrl":"https://doi.org/10.1017/wet.2023.80","url":null,"abstract":"Two low-dose dicamba exposure trials were conducted on container-grown peach trees in Fayetteville, AR. Peach trees were ‘July Prince’ scions grafted onto ‘Guardian’ rootstock and were transplanted into 19 L containers and received experimental dicamba treatments in each year. Container trials were initiated in 2020 and repeated on new trees in 2021. In the repeated application trial, dicamba was applied at 5.6 g ae ha<jats:sup>-1</jats:sup> (1/100× field rate) in five sequences: an untreated control receiving no herbicide, one treatment receiving only initial application, and three treatments receiving initial application plus sequential applications at the same rate occurring 14 d, 28 d, 14 d + 28 d after initial treatment (DAT). A separate trial assessed peach tree responses to dicamba applied at 11.2 g ae ha<jats:sup>-1</jats:sup> (1/50× field rate) using a selection of nozzles with differing droplet spectrum characteristics: Turbo TeeJet® Induction (TTI11002), Air Induction Turbo TeeJet® (AITTJ60-11002), AIXR TeeJet® (AIXR11002, air induction extended range), XR TeeJet® (XR11002, extended range flat fan), and XR TeeJet® (XR1100067, extended range flat fan). Peach tree height, tree cross sectional area (TCSA) and leaf chlorophyll content were not reduced in response to any sequence of dicamba application or nozzle selection. Repeated applications of dicamba at 1/100× rate did not increase peach injury after 28 DAT. By 84 DAT, no effect of nozzle type on peach tree injury was discernable, and all treatments caused below 4% injury. No dicamba or dicamba metabolites were observed in leaf samples collected at 14, 69, or 85 DAT from trees treated with XR1100067 nor in untreated controls. While peach tree injury was observed throughout the experiment, dicamba residues were only detected consistently in 2020 from leaf samples of trees treated with dicamba at 1/50× rate using TTI1102, AITTJ60-11002, AIXR11002, and XR11002 nozzles.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":"11 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138538874","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 Soybean, Cotton, and Tobacco to Volatility of 2,4-D and Dicamba Formulations in Humidome","authors":"Estefania G. Polli, Travis W. Gannon, Mathieu LeCompte, Ronald R. Rogers, Daniel D. Beran","doi":"10.1017/wet.2023.86","DOIUrl":"https://doi.org/10.1017/wet.2023.86","url":null,"abstract":"2,4-D and dicamba are postemergence herbicides widely used to control broadleaf weed species in crop and non-crop areas in the United States. Currently, there are multiple formulations of 2,4-D and dicamba available in the market. Even though the active ingredient is the same, the chemical form may vary by formulation, which can influence the volatility potential of these herbicides. Therefore, the objective of this study was to evaluate the response of soybean, cotton, and tobacco plants exposed to vapor of 2,4-D and dicamba formulations alone or mixed in humidomes for 24 h. Humidome studies were conducted in an open pavilion at the Lake Wheeler Turfgrass Field Lab of the North Carolina State University in Raleigh, NC. Dicamba and mixture treatments injured and affected height of soybean. Injury varied from 55% to 70%, and average plant height was 8.8 cm lower when compared to the untreated control. 2,4-D treatments caused the lowest injury in soybean (≤ 21%), and differences among formulations were identified (dimethylamine &gt; choline &gt; dimethylamine-monomethylamine). However, soybean height was not affected by 2,4-D treatments. No differences between herbicide treatments were observed for cotton. The highest injury in tobacco was caused by dicamba dimethylamine (23.3%). Overall, the effect of 2,4-D and dicamba vapor was species-specific and formulation-dependent. Additionally, weather conditions in the humidomes possibly played a major role on the outcome of this study.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":"2 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138538836","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":"Plasticulture Banana Pepper Response to Clomazone Applied Pretransplanting (PRE)","authors":"Jeanine Arana, Stephen L. Meyers, Emmanuel Cooper, Luis F. Medina, Josué Cerritos, Carlos A. López","doi":"10.1017/wet.2023.78","DOIUrl":"https://doi.org/10.1017/wet.2023.78","url":null,"abstract":"Few published studies exist documenting banana pepper tolerance to clomazone. Therefore, field trials were conducted in 2022 at two Indiana locations [Meigs Horticulture Research Farm and the Pinney Purdue Agricultural Center (PPAC)] to evaluate crop safety in plasticulture-grown banana pepper. The experimental design was a split-plot in which the main plot factor was the clomazone rate (0, 840 and 1,680 g ai ha<jats:sup>-1</jats:sup>), and the subplot factor was cultivar (‘Pageant’ and ‘Sweet Sunset’). Clomazone was applied over-the-top of black polyethylene mulch-covered raised beds and their respective bare ground row middles one day prior to transplanting 12 pepper plants per subplot. Data collected included crop injury on a scale from 0% (no injury) to 100% (crop death) at 2, 4, and 6 wk after treatment (WAT), and plant stand. Two harvests were performed in which mature fruits were counted and weighed. Injury presented as interveinal bleaching only at PPAC 2 and 4 WAT. At this location 1,680 g ha<jats:sup>-1</jats:sup> clomazone resulted in greater injury to ‘Sweet Sunset’ at 2 and 4 WAT (53 and 15%, respectively) than to ‘Pageant’ (19 and 3%, respectively), however, plant stand and yield were not affected by either clomazone rate. These results suggest that the clomazone rate range currently used for bell pepper (280 to 1,120 g ai ha<jats:sup>-1</jats:sup>) can be applied prior to transplanting plasticulture-grown banana pepper with minimal crop injury and without reducing yield.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":"63 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138538864","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":"Interaction of quizalofop-p-ethyl with 2,4-D choline and/or glufosinate for control of volunteer corn in corn resistant to aryloxyphenoxypropionates","authors":"Mandeep Singh, Vipan Kumar, Stevan Z. Knezevic, Suat Irmak, John L. Lindquist, Santosh Pitla, Amit J. Jhala","doi":"10.1017/wet.2023.79","DOIUrl":"https://doi.org/10.1017/wet.2023.79","url":null,"abstract":"Corn resistant to aryloxyphenoxypropionates (FOPs) (Enlist™ corn) enables the use of quizalofop-p-ethyl (QPE) as a selective postemergence (POST) herbicide for control of glufosinate/glyphosate-resistant corn volunteers. Growers usually mix QPE with 2,4-D choline and/or glufosinate to achieve broad-spectrum weed control in Enlist™ corn. The objectives of this study were to (1) evaluate the efficacy of QPE applied alone or mixed with 2,4-D choline and/or glufosinate for control of glufosinate/glyphosate-resistant corn volunteers in Enlist™ corn and (2) determine the impact of application time (V3 or V6 growth stage of volunteer corn) of QPE-based treatments on volunteer corn control as well as Enlist™ corn injury and yield. Field experiments were conducted at South Central Agricultural Lab, Clay Center, NE in 2021 and 2022. Quizalofop-p-ethyl (46 or 93 g ai ha‒1) applied at V3 or V6 growth stage controlled volunteer corn ≥ 88% and ≥ 95% at 14 and 28 d after treatment (DAT), respectively. The QPE (46 g ai ha‒1) mixed with 2,4-D choline (800 g ae ha‒1) had 33% less expected control of V3 volunteer corn in 2021, and 8% less than expected control of V6 volunteer corn in 2022 at 14 DAT. Volunteer corn control was improved by 7%-9% using the higher rate of QPE (93 g ai ha‒1) in a mixture with 2,4-D choline (1,060 g ae ha‒1). The QPE mixed with glufosinate had an additive effect and interactions in any combinations were additive beyond 28 DAT. Mixing 2,4-D choline can reduce QPE efficacy on glufosinate/glyphosate-resistant corn volunteers up to 14 DAT when applied at the V3 or V6 growth stage; however, the antagonistic interaction did not translate into corn yield loss. Increasing the rate of QPE (93 g ai ha‒1) while mixing with 2,4-D choline can reduce antagonism.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135634004","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 cover cropping and conservation tillage on weeds during the critical period for weed control in soybean","authors":"Veronica Yurchak, Alan Leslie, Cerruti R.R. Hooks","doi":"10.1017/wet.2023.82","DOIUrl":"https://doi.org/10.1017/wet.2023.82","url":null,"abstract":"Abstract Limited research has been directed at evaluating the ability of single cover crop plantings to suppress weeds in crops beyond the initial field season. Thus, this experiment was conducted to investigate the ability of a second-year self-regenerated annual and second-year perennial cover crop planting to suppress weeds during the critical period for weed control (CPWC) in soybean. Whole plot treatments included: (1) conventional till, (2) no-till with cover crop residue, (3) living mulch + cover crop residue, and (4) living mulch + winter killed residue. Sub-plot treatments involved weed management intensity: a) no weed management (weedy), b) weeds manually removed through the CPWC (third node soybean stage; V3), and c) weeds manually removed until soybean canopy closure (weed-free). Overall, total annual cover crop biomass during the second field season was comparable to biomass obtained from direct seeded stands during the initial field season. All cover crop treatments reduced total weed biomass through the CPWC compared to conventional till. Soybean yield was low across all treatments in this experiment. Still, yield was similar between cover crop and conventional till treatments at one site-year, however, yields were lower in all cover crop treatments at the other site-year.","PeriodicalId":23710,"journal":{"name":"Weed Technology","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135635362","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}