Efficacy Of Herbicides Research Articles

Herbicidal activity of n-hexane, ethyl acetate and methanol purple nutsedge (Cyperus rotundus L.) extracts on Amaranthus spinosus L.

Environmentally friendly weed control is highly recommended to be implemented in agriculture. The objective of this research was to assess the herbicidal efficacy of n-hexane, ethyl acetate, and methanol extracts derived from the tuber of Cyperus rotundus L. on Amaranthus spinosus L. The tuber was consecutively extricated with n-hexane, ethyl acetate, and methanol. These extracts were given to A. spinosus in pot culture at concentrations of 5%, 10%, 15%, and 20%.The herbicide (2,4-D at 0.686 kg a.i. ha−1) and distilled water were acted as positive and negative controls. The extract had variable effects on weed control percentage, leaf area, root length, shoot and root dry weight of A. spinosus. Major compounds in GC-MS in n-hexane of C. rotundus extract were: 7-Isopropenyl-1, 4a- dimethy l-4,4a,5,6,7,8-hexahydro-3H-naphthalen-2-one (19.60%), phthalic acid (7%), dibutyl phthalate (3.97%); in ethyl acetat extract were propanetriol, 1-acetate (37,40%) and 7 Isopropenyl-1,4a-dimethyl-4,4a,5,6,7,8-hexahyro-3H-naphthalen-2-one (6.42%); in methanol extract were d-glycero-d-ido-heptose (21.31%) and octaethylene glycol monododecyl ether (39.15%). The 20% of those extracts causing 53.33%, 64.33% and 55.33 destruction of A. spinosus respectively at 14 Days After Aplication. Thus, ethyl acetate is the most potent herbicide extract to be developed as an agent against A. spinosus.

Herbicide Bioassay Using a Multi-Well Plate and Plant Spectral Image Analysis.

A spectral image analysis has the potential to replace traditional approaches for assessing plant responses to different types of stresses, including herbicides, through non-destructive and high-throughput screening (HTS). Therefore, this study was conducted to develop a rapid bioassay method using a multi-well plate and spectral image analysis for the diagnosis of herbicide activity and modes of action. Crabgrass (Digitaria ciliaris), as a model weed, was cultivated in multi-well plates and subsequently treated with six herbicides (paraquat, tiafenacil, penoxsulam, isoxaflutole, glufosinate, and glyphosate) with different modes of action when the crabgrass reached the 1-leaf stage, using only a quarter of the recommended dose. To detect the plant's response to herbicides, plant spectral images were acquired after herbicide treatment using RGB, infrared (IR) thermal, and chlorophyll fluorescence (CF) sensors and analyzed for diagnosing herbicide efficacy and modes of action. A principal component analysis (PCA), using all spectral data, successfully distinguished herbicides and clustered depending on their modes of action. The performed experiments showed that the multi-well plate assay combined with a spectral image analysis can be successfully applied for herbicide bioassays. In addition, the use of spectral image sensors, especially CF images, would facilitate HTS by enabling the rapid observation of herbicide responses at as early as 3 h after herbicide treatment.

Droplet Deposition and Efficacy of Real-Time Variable-Rate Application of Herbicides at Reduced Dose in Winter Wheat Fields

Using an intelligent plant protection machine for spraying herbicides at a real-time variable rate plays a key role in improving the utilization efficiency of herbicides and reducing environmental pollution. Spraying volume (SV) and nozzle size (NS) are key factors influencing droplet deposition and herbicide efficacy and safety. A three-way split-split plot design experiment was conducted in the winter wheat field, with SV 180 L·ha−1 and 150 L·ha−1 in the main plot, a turbo air induction nozzle TTI11004 and TTI11003 in the subplot, herbicide flucarbazone-Na 70% WG mixed with florasulam 50 g·L−1 SC as the recommended dose, and a 20% reduced dose in the sub-subplot. Droplet deposition and weed control efficacy treated by these three factors and their combination were evaluated. Results indicated that there was a significant influence of SV on droplet coverage and density, but no significant influence of NS and its interaction with SV. A droplet coverage and density of treatment at 180 L·ha−1 were both significantly higher than at 150 L·ha−1. The influence of SV and its interaction with NS on weed control efficacy were significant. The efficacy of treatment TTI11004 at SV 180 L·ha−1 was the highest but decreased when NS was switched to TTI11003 and the SV was decreased to 150 L·ha−1. There was no significant effect of all the treatments on winter wheat yield and its components, but the yield loss could be reduced by 2.36% when the herbicide input was reduced by 20%. We can conclude that herbicide input can be reduced by at least 20% using the intelligent machine while equipped with the right NS at the right SV, which would increase the safety of winter wheat production.

Impact of soil-residual herbicides on industrial hemp (Cannabis sativa) phytotoxicity and biomass yield in west Texas

Abstract Industrial hemp is a multipurpose crop cultivated for fiber, seed, human food, and animal feed. Hemp legalization in Texas creates a considerable potential to increase its acreage in semi-arid conditions; however, knowledge is limited on growing hemp optimally in Texas. Best management practices, including weed control, require evaluation for profitable hemp production. As little is known about the herbicide tolerance of hemp, field studies were conducted to test several soil-residual herbicides with different modes of action for phytotoxicity to two hemp cultivars, ‘Yuma’ and ‘Jinma’. The experimental units were randomized three times in a blocked split-plot design with hemp cultivars in the main plots and soil-residual herbicides in the subplots. Ethalfluralin, the mixture of sulfentrazone and S-metolachlor, prometryn, and S-metolachlor, resulted in 60% to 90% and 73% to 100% weed control as compared to the nontreated control in 2021 and 2022, respectively. The highest hemp germination, stand count, and plant height were observed with ethalfluralin and S-metolachlor herbicides; however, no significant differences were observed for hemp germination and plant height compared to the nontreated control. S-metolachlor, ethalfluralin, fomesafen, and prometryn resulted in similar hemp biomass compared to the nontreated control. Overall, the results indicate that hemp is tolerant to ethalfluralin, prometryn, and S-metolachlor, and these soil-residual herbicides were effective for weed control in hemp. The mixture of bicyclopyrone plus S-metolachlor, metribuzin plus S-metolachlor, and mesotrione should be avoided, as they caused significant injury to hemp plants. Future research is needed to test the efficacy of different preemergence and postemergence herbicides that can be used in industrial hemp grown under different environments, making sure the delta-9-tetrahydrocannabinol content of the hemp is below the legal content restrictions.

Studying the efficacy of herbicides against annual cereal and dicotyledonous weeds

The harmfulness of annual cereal weeds increases annually. In the Akmola Region, the species composition of weed vegetation, numbering many species and infesting crops, is very diverse and is represented by the following and the most common: Avena fatua (common wild oat), Echinochloa grusgalli (chicken millet), and Setaria viridis (gray mouse). High severity is also observed in lamb’s quarters (Chenopodium album), common beetle (Amaranthus retroflexus), and European stickseed (Lappula squarrosa). The evaluated herbicides include “Dezormon”, “Dezormon Efir”, “Topik”, “Ovsyugen Extra”, combined formulations like “Ovsyugen Extra + Arbalet + Liberti”, “Ester + Ovsyugen Extra”, “Megastar + Efir”, and several others, each demonstrating varying degrees of biological effectiveness, ranging from 76% to 99%. The outcomes indicate that the use of these herbicides significantly mitigates the weediness of the cereal crops, thereby enhancing the grain yield. This study provides valuable insights into the strategic application of herbicide mixtures as a sustainable solution for weed management in cereal cultivation, emphasizing the need for integrated weed control strategies to ensure agricultural sustainability and food security.

Influence of carrier water pH and hardness on imazapic efficacy for sicklepod (Senna obtusifolia L.) control in peanut

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 crops. In separate field experiments imazapic was applied postemergence at 0.071 kg ai ha−1 with carrier water pH levels of 5, 6, 7, 8, or 9; and hardness levels of 0 (deionized water), 100, 200, 400, or 500 mg L−1 of CaCO3 equivalent. In greenhouse experiments, imazapic was applied to sicklepod that was either 10 cm, 15 cm, or 20 cm tall at similar carrier water pH levels and hardness levels of 0, 100, 200, 400, or 800 mg L−1 of CaCO3. 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-tall sicklepod; however, when applied to 15- or 20-cm-tall sicklepod, control was at least 25% greater with acidic (pH 5) compared to alkaline (pH 9) carrier water. Results from the field study showed that carrier water hardness ≤500 ppm did not reduce the efficacy of imazapic to control sicklepod. In the greenhouse study, regardless of sicklepod height, carrier water hardness of 800 mg L−1 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 that both acidic and alkaline carrier water pH and hardness (800 mg L−1 CaCO3 L−1) have the potential to reduce imazapic efficacy on sicklepod, and appropriate spray solution amendments maybe be needed to maintain optimum efficacy.

Zalo Tank Mixtures for Early Postemergence Herbicide Efficacy in Corn

Zalo Tank Mixtures for Early Postemergence Herbicide Efficacy in Corn

Single and Split Applications for Herbicide Efficacy in Corn

Single and Split Applications for Herbicide Efficacy in Corn

Evaluation of herbicide efficacy on weed dynamics and yield of maize in maize-sunflower cropping system

Evaluation of herbicide efficacy on weed dynamics and yield of maize in maize-sunflower cropping system

Quick In Situ Evaluation of Herbicide Efficacy in Maize (Zea mays L.) Crop

Sustainable crop and weed management is among the crucial challenges in the era of the EU Green Deal. The main objective of the present study was to apply an innovative approach for the rapid assessment of herbicide efficacy in maize (Zea mays) crop in four different trials during two years. Weed NDVI values were recorded at two weeks after treatment, while weed biomass and crop yield were also measured. The results revealed significant differences between the several treatments. In many cases, significant effects of herbicide application on the normalized difference vegetation index (NDVI) values and weed biomass were noticed at two weeks after treatment. Moreover, the mixture nicosulfuron + rimsulfuron + mesotrione resulted in high efficacy on the crop yield of all fields. Consequently, our approach can allow for an early prediction of the real field efficacy of several herbicides and thus act as an alert for the farmers in order to choose the most efficient herbicide, avoid applications of low efficacy and reduce the herbicide inputs.

Influence of Application Timings, Rates, and Adjuvants on Tiencarbazone-Methyl Plus Isoxaflutole and Mesotrione with Nicosulfuron and Rimsulfuron on Weed Control and Yield of Maize

Weed control in maize is usually limited to a single herbicide treatment, but the application of two or more herbicides is associated with many benefits, e.g., increasing the spectrum of control weeds, reducing the risk of damage to crops by using reduced rates of herbicides, limiting their residues in the soil or crop, etc. This field experiment was conducted in the years 2016–2018 to determine whether the split application of soil-applied thiencarbazone-methyl + isoxaflutole and foliar-applied mesotrione + nicosulfuron + rimsulfuron, in reduced rates with adjuvants, can contribute to enhancing herbicide effectiveness and increasing maize yield. Weed control in maize in a split-dose system with a mixture of thiencarbazone-methyl + isoxaflutole at strongly reduced rates with the addition of UAN and the adjuvant Atpolan SoilMaxx or Grounded, and then mesotrione + nicosulfuron + rimsulfuron at strongly reduced rates with UAN and Atpolan SoilMaxx or Actirob 842 EC allowed for great control of weeds. The total amount of substances was slightly higher than in single treatments with adjuvants, but lower than for individual active substances, leading to a reduction in the amount of active substances reaching the environment, while maintaining very high herbicide efficacy.

Non–target site mechanisms of cross-resistance evolution to florpyrauxifen-benzyl in 2,4-D–resistant Palmer amaranth (Amaranthus palmeri)

AbstractThe evolution of herbicide resistance in weeds can reduce the herbicide’s efficacy, depleting crop yield and quality. Our group previously confirmed 2,4-D resistance in three Palmer amaranth (Amaranthus palmeri S. Watson) populations (R1 to R3). In the current study, the first filial (F1) seeds of 2,4-D–resistant populations were subjected to screening tests for resistance to other auxin-mimicking herbicides, florpyrauxifen-benzyl (FPB; 30 g ai ha−1) and dicamba (560 g ae ha−1). Dicamba killed all resistant populations. FPB provided 100% control of only the R3 population. Sensitivities to FPB were reduced by 2 and 35 percentage points in R1 and R2 populations, respectively. Pretreatment with malathion increased FPB sensitivity by 15 percentage points in the R2 population. FPB resistance characterization and mechanism were evaluated using a purified line of the R2 population (F2). The FPB sensitivity was 29-fold lower in the F2 line than in the susceptible (S) standard. Absorption, translocation, and total metabolism of FPB were similar for S and R2 populations. However, less florpyrauxifen-acid (FPA) was detected in the R2 population (17.0% to 25.4%) than in the S population (22.8% to 33.2%), due to its rapid metabolism and/or reduced production with resistance evolution. Because the results of the non–target site resistance mechanism evaluation observed in this study were insufficient to account for the 29-fold reduced sensitivity of the R2 population to FPB, further genetic studies are needed to investigate the presence of target-site resistance in that population.

Improved control of Taraxacum officinale with 2,4‐D in the field from ammonium sulphate additions

AbstractTaraxacum officinale G.H. Weber ex Wiggers (dandelion) is a common weed of cool‐season turfgrass with 2,4‐D as the most commonly used herbicide for its control. Hard water is known to antagonise 2,4‐D dimethylamine herbicide efficacy in greenhouse studies, and this antagonism is mitigated by adding the water conditioning agent ammonium sulphate (AMS) to spray mixtures. As greenhouse herbicide efficacy trials do not always provide similar control to field studies, this experiment was undertaken to determine how hard water and AMS influences 2,4‐D dimethylamine control of T. officinale in established lawns. Hard water was prepared to achieve 0, 275, 450 and 675 mg CaCO3 L−1. The 2,4‐D was applied at each hardness level with and without AMS at 20 g L−1 in eight separate field trials across three sites and two seasons. Regardless of water hardness level, 2,4‐D treatments with AMS added reduced T. officinale cover at 52 weeks after application (WAA) compared to those without AMS. Similarly, fewer T. officinale plants were recorded when adding AMS to 2,4‐D. Taraxacum officinale cover at 52 WAA was higher when applied in water with a hardness of 450 mg CaCO3 L−1 or more compared to applications in distilled water (0 mg CaCO3 L−1). When hard water antagonism occurred, the addition of AMS to the spray mixture reduced the antagonism. Based on this field experiment and consistent with greenhouse experiments, applicators should mix AMS at 20 g L−1 when applying 2,4‐D dimethylamine, especially in hard water.

Valorizing Tree-Nutshell Particles as Delivery Vehicles for a Natural Herbicide.

The United States is a principal producer of tree nuts (almonds, pistachios, and walnuts), resulting in the generation of excess of tree-nutshell by-products each year, with few market outlets. A nutshell is an essential, lignocellulosic layer that protects a kernel (seed) from the environment during cultivation. The objective of this study was to develop nutshell by-products as herbicide delivery systems, which would not only enable sustainable weed control in fields but also increases nutshell value and reduce the cost of waste disposal. We recently identified a natural salicylaldehyde (SA) that emits volatiles with both herbicidal and antifungal properties. In this study, walnut shell particles saturated with 0.8 to 1.6 M SA were developed as delivery vehicles for SA to soil, which allowed for the controlled release of an SA fumigant for weed control. The pre- and post-emergent herbicidal efficacy of SA was investigated using model monocot (Lolium arundinaceum (Schreb.) Darbysh; turfgrass) and dicot (Brassica rapa var. pekinensis; Chinese cabbage) plants. We compared (1) the effects of different types of solvents for dissolving SA (dimethyl sulfoxide (DMSO) and ethanol (60%, v/v)), and (2) the effect of covering soil with plastic layers (i.e., soil pasteurization) or not covering soil during SA fumigation using nutshells. Results: In the pre-emergent herbicidal testing with the soil covered, the dicot plants exhibited levels of higher susceptibility to SA in DMSO emitted from nutshells when compared to the monocot plants. The seed germination frequencies in the dicots were 15% and 1% with 0.8 and 1.6 M SA, respectively, while those in the monocots were 32% and 18%, respectively, under the same test conditions. In the post-emergent herbicidal testing with the soil covered, the growth of both the monocot and dicot plants was completely prevented after 5 to 7 days of SA fumigation, resulting in the deaths of entire plants. It was noteworthy that in the post-emergent herbicidal testing, SA dissolved in ethanol (60%, v/v) completely disrupted the growth of the monocot and dicot plants as early as 3 days after SA emission from the nutshells, even without the soil being covered. Tree-nutshell particles could serve as effective SA delivery vehicles with controlled release capabilities for SA. The SA exhibited pre- and post-emergent herbicidal activities against the monocot and dicot plants at most growth stages. SA (0.8 and 1.6 M) dissolved in ethanol (60%, v/v) might exert a synergism for higher herbicidal activity after emission from nutshells. Since tree nuts capture/store a substantial amount of carbon over their life-cycles, the new and sustainable utility of using nutshells not only reduces carbon emissions but also valorizes tree-nut by-products, thus benefitting the tree-nut industry.

Performance of spray nozzles and droplet size on glufosinate deposition and weed biological efficacy

Nozzle type and droplet size are one of the most important factors that affect spray deposition and the efficacy of herbicides. This study focused on evaluating the performance of spray nozzles and droplet sizes on the deposition of glufosinate and its biological efficacy of two weed species. Treatments consisted of spraying glufosinate on Euphorbia heterophylla and Digitaria insularis by five spray nozzles (XR 11002 – fine droplet; TT 11002 – coarse; AIXR 11002 – very coarse; AIXR 110025 – extremely coarse; and TTI 11002 – ultra coarse) assessing the spray deposits and its influence on plant biomass reduction. The spray deposits on E. heterophylla were found to be similar between most of the spray nozzles, except for the TTI 11002 nozzle, which had lower spray deposits. In contrast, for D. insularis, the spray deposits tended to decrease as the droplet size increased. The spray uniformity was lower for the AIXR 11002 nozzle for E. heterophylla and the XR 11002 nozzle for D. insularis. Regarding the efficacy of glufosinate on both weeds, the lower C50 (concentration required for 50% dry weight reduction) were obtained using the XR 11002 nozzle with fine droplets. The TT 11002 nozzle and the AIXR 11002 nozzle showed intermediate C50, making them viable options to reduce spray drift and achieve acceptable weed control. However, the nozzles using extremely coarse (AIXR 110025) and ultra-coarse (TTI 11002) droplet class resulted in higher C50, indicating reduced herbicide efficacy. Our study provided clues on how different spray nozzles and droplet sizes can significantly impact spray deposits and herbicide efficacy on the control of E. heterophylla and D. insularis. Nozzles with fine droplet class generally provided better control, while extremely coarse and ultra-coarse showed reduced efficacy at weed control.

Impact of dose and adjuvant on herbicidal efficacy of birch‐based pyrolysis liquid

AbstractReduction of pesticide use to benefit the environment is a topical issue in the EU. There is a call for development and more widespread use of sustainable alternative weed control measures. Pyrolysis liquid (PL), a by‐product of charcoal and biochar production, contains numerous compounds, including organic acids, alcohols, phenols and furans. PL has shown promising results when used against several broad‐leaved weeds but its effect on grassy weeds is largely untested. To provide an alternative to synthetic herbicides, PL should be effective and applicable at field scale. In this research, we initially evaluated the potential of birch (Betula sp.) based PL to control mono‐ and dicotyledonous plants under greenhouse conditions and determined if efficacy is improved by addition of an adjuvant. Second, the efficacy of PL for controlling Elymus repens (L.) Gould was compared with glyphosate and two other synthetic herbicides in a no‐tillage system under field conditions. As expected, dicotyledonous plants were more sensitive to acid‐based herbicides than monocotyledonous plants. In contrast to our expectations, the herbicidal efficacy of PL was lower than an acetic acid‐based herbicide and addition of an adjuvant did not improve efficacy. In conclusion, when used at commercially and practically realistic doses, the efficacy of PL control on monocotyledonous weeds such as E. repens is weak. More product development is needed to improve PL quality and efficacy and to establish practical and cost‐effective application levels for weed control on the field scale.

Evaluating Herbicides Efficacy Against Coffee Weeds in Southwest Ethiopia

Evaluating Herbicides Efficacy Against Coffee Weeds in Southwest Ethiopia

Efficacy of different herbicides for controlling grass predominant weed flora and achieving higher production in dual purpose linseed under mid hills of Himachal Pradesh

A field experiment was conducted to study the effect of herbicide treatments on the weed flora and the production of the dual-purpose Linseed. The results revealed that grassy weeds viz., Phalaris minor, Lolium temulentum and Avena ludoviciana constituted 43.2, 23.2 and 17.2% of the total weed flora at 90 DAS. Among the broadleaf weeds, Vicia sativa and Spergulla arvensis constituted about 8.4% of total weed flora. As the crop was mainly infested with grassy weeds, effective control of total weeds with the application of clodinafop 60 g/ha (Post.), pendimethalin 1.0 kg/ha (Pre.) and isoproturon 1.25 kg/ha (Post.) as equivalent to hand weeding twice resulted in significantly higher seed, straw, biological, oil and fibre yield of Linseed. As far as the economics is concerned, significantly higher net returns of ₹ 54401 and 3051/ha and net returns per rupee invested (2.01 and 1.90) were obtained by statistically similar treatments of clodinafop 60 g/ha (Post.) and pendimethalin 1.0 kg/ha (Pre.), respectively. Thus, depending upon the situation in dual-purpose Linseed, selecting either of these appropriate chemicals is the better option for controlling grass-predominant weed flora and obtaining higher yields (seed and fiber) with better returns.

Palmer Amaranth (Amaranthus palmeri) Control in Dicamba-Tolerant Cotton (Gossypium hirsutum) when Applied with Various Dicamba + Insecticide Tank-Mixtures

Postemergence herbicide application timings for Palmer amaranth (Amaranthus palmeri) often coincide with foliar insecticide applications in cotton (Gossypium hirsutum). Combining multiple pesticides into a single application increases efficiency while reducing overall application cost. Multiple foliar insecticides are now labeled for dicamba tank-mixes. However, there is limited literature with respect to efficacy of dicamba on Palmer amaranth control when applied with insecticides. Field experiments were conducted from 2018 to 2020 to evaluate the effect of carrier volume and insecticide on the efficacy of dicamba (XtendiMaxTM with VaporGripTM) to control Palmer amaranth in XtendFlex™ cotton production systems. Dicamba was tank-mixed with acephate and dimethoate to four-leaf cotton and with thiamethoxam and sulfoxaflor just prior to bloom. Applications were made at carrier volumes of 140 and 280 L ha-1 and with a single spray droplet size of 800 µm. Palmer amaranth control 7 d after treatment was negatively impacted when applications included dimethoate; however, no corresponding response in seedcotton yield was observed relative to dicamba applied alone. However, when pooled over carrier volume, applications containing dicamba + acephate resulted in higher seedcotton yield than applications of dicamba + dimethoate. Additionally, pre-bloom applications of dicamba + thiamethoxam or sulfoxaflor increased Palmer amaranth efficacy relative to dicamba applied alone. Although certain insecticides are known to increase herbicidal crop response, the impact of insecticides on herbicide efficacy to control specific weed species is largely unknown. Therefore, we conclude that multiple dicamba + acephate, thiamethoxam, or sulfoxaflor tank-mixtures provide similar control of Palmer amaranth compared to dicamba alone.

A systematic review of chemical weed management in peanut (Arachis hypogaea) in the United States: challenges and opportunities

AbstractHerbicides are the primary tool for controlling weeds in peanut (Arachis hypogaea L.) and are crucial to sustainable peanut production in the United States. The literature on chemical weed management in peanut in the past 53 yr (1970 to 2022) in the United States was systematically reviewed to highlight the strengths and weaknesses of different herbicides and identify current research gaps in chemical weed management. Residual weed control in peanut is achieved mainly with dimethenamid-P, ethalfluralin, pendimethalin, and S-metolachlor. More recently, the use of the protoporphyrinogen oxidase inhibitor flumioxazin and acetolactate synthase inhibitors, such as diclosulam, for residual weed control in peanut has increased considerably. Postemergence broadleaf weed control in peanut is achieved mainly with acifluorfen, bentazon, diclosulam, imazapic, lactofen, paraquat, and 2,4-DB, while the graminicides clethodim and sethoxydim are the major postemergence grass weed control herbicides in peanut. Although several herbicides are available for weed control in peanut, no single herbicide can provide season-long weed control due to limited application timing, lack of extended residual activity, variability in weed control spectrum, and rotational restrictions. Therefore, effective weed management in peanut often requires herbicide mixtures and/or sequential application of preplant-incorporated, preemergence, and/or postemergence herbicides. However, the available literature showed a substantive range in herbicide efficacy due to variations in environmental conditions and flushes of weed germination across years and locations. Despite the relatively high efficacy of herbicides, the selection of herbicide-resistant weeds is another area of increasing concern. Future research should focus on developing new strategies for preventing or delaying the development of resistance and improving herbicide efficacy within the context of climate change and emerging constraints such as water shortages, rising temperatures, and increasing CO2 concentration.