Weed Control and Peanut (Arachis hypogaea L.) Cultivar Response to Encapsulated Acetochlor

Grichar, W. James; Dotray, Peter A.; Etheredge, Luke M.

doi:10.3146/ps14-12.1

Cited by 3 publications

(7 citation statements)

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“…Visible injury from metolachlor does not always result in lower peanut yield compared with yield of non-treated peanut under weed-free conditions when applied at rates recommended in by the manufacturer (Cardina and Swann, 1988;Clewis et al, 2007;Grichar and Dotray, 2012). In a study similar to the one reported in this article, Grichar et al (2015) observed in Texas that peanut yield and market grade characteristics were not affected by acetochlor rate or application timing (PPI, PRE, EPOST, POST). The indeterminate growth habit of peanut often enables peanut to recover from early season stress including herbicide injury and yield is Means within columns for main effects (herbicide or application timing) followed by the same letter are not significantly different according to Fisher's Protected LSD Test at P 0.05.…”

Section: Peanut Tolerancesupporting

confidence: 68%

“…in peanut was improved when a POST application of imazapic plus 2,4-DB followed PRE S-metolachlor alone or in combination with diclosulam, flumioxazin, or sulfentrazone, compared with PRE-or POST-only treatments (Clewis et al 2007). Grichar et al (2015) reported that the addition of pendimethalin and lactofen to acetochlor, flumioxazin, or S-metolachlor programs improved weed control in peanut.…”

Section: Peanut Is a Valuable Commodity In The Unitedmentioning

confidence: 99%

“…In addition to improving crop safety, this formulation of acetochlor extends herbicide persistence in the soil compared with the emulsifiable concentrate formulation (Parker et al, 2005;Scher et al, 1998). Grichar et al (2015) reported no negative effect of acetochlor ME application timing and rate on peanut grade and yield in runner and Spanish market type cultivars. Cahoon et al (2015) documented that acetochlor ME applied PRE caused less than 8% early season injury to cotton and at least 90% control of Palmer amaranth.…”

Section: Peanut Is a Valuable Commodity In The Unitedmentioning

confidence: 99%

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Weed Control and Peanut (Arachis hypogaea L.) Response to Acetochlor Alone and in Combination with Various Herbicides

et al. 2018

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Acetochlor, a chloroacetamide herbicide, is now registered for preplant (PPI), preemergence (PRE), and postemergence (POST) application in peanut. Field research was conducted during 2011 and 2012 in Georgia and North Carolina to determine peanut response and weed control by acetochlor compared with S-metolachlor alone and in programs with other herbicides. In weedfree experiments, peanut tolerance to acetochlor (1.26 and 2.52 kg ai/ha) and S-metolachlor (1.42 kg ai/ha) were evaluated when applied PPI, PRE, early postemergence (EPOST), or POST. Peanut tolerance to acetochlor was similar to S-metolachlor with no negative impact of either herbicide on peanut yield compared with non-treated peanut in absence of weed interference. When applied PRE, acetochlor controlled Palmer amaranth, pitted morningglory, sicklepod, and Texas millet similarly to S-metolachlor while control of broadleaf signalgrass was greater with S-metolachlor. Weed control programs containing EPOST and/or POST applications of herbicides following PRE herbicides provided the best overall weed control but did not affect yellow nutsedge control regardless of whether acetochlor or S-metolachlor were applied. Herbicide programs including PRE, EPOST, and POST herbicides most often resulted in the greatest yields. There was no difference in peanut yield regardless of the presence of acetochlor or S-metolachlor in a comprehensive herbicide program.

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Section: Peanut Tolerancesupporting

confidence: 68%

Section: Peanut Is a Valuable Commodity In The Unitedmentioning

confidence: 99%

Section: Peanut Is a Valuable Commodity In The Unitedmentioning

confidence: 99%

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Weed Control and Peanut (Arachis hypogaea L.) Response to Acetochlor Alone and in Combination with Various Herbicides

et al. 2018

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“…Incorporating these herbicides into the soil ensures activity in situations where preemergence applications may fail from the absence of irrigation or inadequate rainfall; however, compared with activated preemergence applications, control or suppression of some weeds is lower (Grichar et al 2000). The microencapsulated formulation of acetochlor registered for use in peanut provides longer residual activity and higher crop safety than emulsifiable concentrate formulations (Anonymous 2010; Grichar et al 2015). In general, most preemergence herbicide applications, such as S -metolachlor and acetochlor applied preemergence, in peanut require adequate rainfall or irrigation for activation and optimum efficacy.…”

Section: Chemical Weed Control In Peanut In the United Statesmentioning

confidence: 99%

“…Variable peanut injury ranging from <5% to 33% was reported from preemergence application of S -metolachlor up to 1.40 kg ai ha −1 (Basinger et al 2021; Chaudhari et al 2018; Clewis et al 2007; Grichar et al 2008). Although various levels of peanut injury have been observed from chloroacetamide herbicides, yields were not negatively impacted, except at rates higher than label recommended (Chaudhari et al 2018; Clewis et al 2007; Grichar et al 2015). In studies evaluating peanut tolerance to preemergence applications of S -metolachlor at 1.1, 1.4, and 2.8 kg ha −1 , Basinger et al (2021) observed yield reduction (8.9%) only at the 2.6X (2.8 kg ha −1 ) recommended rate.…”

Section: Chemical Weed Control In Peanut In the United Statesmentioning

confidence: 99%

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

Daramola,

Iboyi,

MacDonald

et al. 2023

Weed Sci

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Herbicides are the primary tool for controlling weeds in peanut and are crucial to sustainable peanut (Arachis hypogaea L.) production in the United States (US). The literature on chemical weed management in peanut in the past 53 years (1970 to 2022) in the US was systematically reviewed to highlight the strength 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, flumioxazin, pendimethalin, and S-metolachlor. More recently, the use of the PPO-inhibitor, and ALS-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 pre-plant 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, temperature rise and increasing CO2 concentration.

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Control of multiple-herbicide-resistant waterhemp with acetochlor-based herbicide mixtures in soybean

Symington,

Soltani,

Kaastra

et al. 2024

Weed Technol

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Waterhemp has evolved resistance to Group 2, 5, 9, 14, and 27 herbicides in Ontario, Canada, making control of this challenging weed even more difficult. Acetochlor is a Group 15, chloroacetanilide herbicide that has activity on many small-seeded annual grasses and some small-seeded annual broadleaf weeds, including waterhemp. The objective of this study was to ascertain if acetochlor mixtures with broadleaf herbicides (dicamba, metribuzin, diflufenican, sulfentrazone, or flumioxazin), applied preemergence (PRE), increase multiple-herbicide-resistant (MHR) waterhemp control in soybean. Five trials were conducted over 2 yr (2021 to 2022). The acetochlor mixtures caused ≤7% soybean injury, except acetochlor + flumioxazin, which caused 19% soybean injury. Acetochlor applied PRE controlled MHR waterhemp 89% at 4 wk after application (WAA). Dicamba, metribuzin, diflufenican, sulfentrazone, or flumioxazin controlled MHR waterhemp 59%, 67%, 58%, 64%, and 86%, respectively, at 4 WAA. Acetochlor applied in a mixture with dicamba, metribuzin, diflufenican, sulfentrazone, or flumioxazin provided good to excellent control of MHR waterhemp; control ranged from 91% to 98% but was similar to acetochlor applied alone. Acetochlor alone reduced MHR waterhemp density and biomass 98% and 93%; acetochlor + flumioxazin reduced waterhemp density and biomass by an additional 2% and 7%, respectively. This research concludes that acetochlor applied in a mixture with flumioxazin was the most efficacious mixture evaluated for MHR waterhemp control.

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Weed Control and Peanut (Arachis hypogaea L.) Cultivar Response to Encapsulated Acetochlor

Cited by 3 publications

References 0 publications

Weed Control and Peanut (Arachis hypogaea L.) Response to Acetochlor Alone and in Combination with Various Herbicides

Weed Control and Peanut (Arachis hypogaea L.) Response to Acetochlor Alone and in Combination with Various Herbicides

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

Control of multiple-herbicide-resistant waterhemp with acetochlor-based herbicide mixtures in soybean

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