Nutsedge (<i>Cyperus</i>spp.) Control in Peanut (<i>Arachis hypogaea</i>) with AC 263,222 and Imazethapyr

Grichar, W. James; Nester, Paul R.

doi:10.1017/s0890037x00043311

Cited by 38 publications

(60 citation statements)

References 14 publications

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“…However, imazethapyr does not consistently control yel low nutsedge (Wilcut et al, 1991a;Grichar et al, 1992). Imazapic controlled purple and yellow nutsedge as well as or better than imazethapyr at all application timings (Dotray and Keeling, 1997;Grichar and Nester, 1997) and provided better control of purple and yellow nut sedge in field experiments than other currently regis tered herbicides in peanut (Gooden and Wixson, 1992;Colvin and Brecke, 1993;Grichar and Nester, 1993;Wilcut et al, 1994a). Imazapic also has a longer period of residual weed control when applied postemergence (POST) than imazethapyr.…”

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confidence: 99%

Diclosulam for Weed Control in Texas Peanut1

Grichar¹,

Dotray²,

Sestak

1999

Peanut Science

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Field experiments were conducted in 1995 through 1997 in south and west Texas to evaluate diclosulam [N-(2,6-dichlorophenyl)-5-ethoxy-7-fluoro(l,2,4)-triazolo(l,5c)-pyrimidine-2-sulfonamide] for weed con trol in peanut. Diclosulam applied preplant incorpo rated at 0.01 kg ai/ha in combination with ethalfluralin at 0.84 kg ai/ha controlled Texas panicum, Palmer ama ranth, morningglory species, and golden crownbeard at least 95% and devil's-claw 91%. When diclosulam rates were increased to 0.02 kg/ha, yellow and purple nutsedge were controlled at least 89 and 72%, respectively. Diclosulam applied postemergence (POST) provided erratic yellow nutsedge control.

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confidence: 99%

Diclosulam for Weed Control in Texas Peanut1

Grichar¹,

Dotray²,

Sestak

1999

Peanut Science

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“…Bentazon failed to control Palmer amaranth (<50%). In earlier work, imazapic at 0.04 to 0.07 kg/ha controlled Palmer amaranth at least 95% when applied EPOST while imazethapyr provided at least 90% control in 2 of the 3 yr [47]. Mayo et al [48] concluded that Palmer amaranth control generally decreased as application timing was delayed for acifluorfen, imazethapyr, or lactofen.…”

Section: Discussionmentioning

confidence: 96%

“…In commercial fields, imazapic has provided excellent devil's-claw control (author's personal observations). Grichar and Nester [47] reported that imazapic controlled Palmer amaranth at least 80% regardless of application timing while acifluorfen, bentazon, or 2,4-DB failed to control Palmer amaranth (<70%) regardless of application timing. In 2005, acifluorfen, imazapic, imazethapyr, 2,4-DB, and lactofen controlled Palmer amaranth at least 96% regardless of application timing.…”

Section: Discussionmentioning

confidence: 99%

Weed Control and Peanut Tolerance with Ethalfluralin-Based Herbicide Systems

Grichar¹,

Dotray

2012

International Journal of Agronomy

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Field studies were conducted from 2007 through 2009 to determine weed efficacy and peanut (Arachis hypogaea L.) response to herbicide systems that included ethalfluralin applied preplant incorporated. Control of devil's claw (Proboscidea louisianica (Mill.) Thellung), yellow nutsedge (Cyperus esculentus L.), Palmer amaranth (Amaranthus palmeri S. Wats.), and puncturevine (Tribulus terrestris L.) was most consistent with ethalfluralin followed by either imazapic or imazethapyr applied postemergence. Peanut stunting was 19% when paraquat alone was applied early-postemergence. Stunting increased to greater than 30% when ethalfluralin applied preplant incorporated was followed by S-metolachlor applied preemergence and paraquat applied earlypostemergence. Stunting (7%) was also observed when ethalfluralin was followed by flumioxazin plus S-metolachlor applied preemergence with lactofen applied mid-postemergence. Ethalfluralin followed by paraquat applied early-postemergence reduced peanut yield when compared to the nontreated check. Ethalfluralin applied preplant incorporated followed by imazapic applied mid-postemergence provided the greatest yield (6220 kg/ha). None of the herbicide treatments reduced peanut grade (sound mature kernels plus sound splits) when compared with the nontreated check.

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“…Visual ratings of purple nutsedge foliar chlorosis at 7 WAT were regressed on imazapic rate and fit (R 2 nonlinear ≥0.77, P < 0.0001) to a log-logistic regression model (Figure 1). The rate of imazapic needed to cause a 50% response (parameter I 50 ) was estimated at 35 g ha −1 (Table 1), while the registered use rate in peanut (70 g ha Table 1. presence of a competitive peanut crop (Grichar and Nester 1997). Purple nutsedge is intolerant of plant competition that limits light interception by the weed and will typically not maintain foliar growth under these conditions (Stoller and Sweet 1987).…”

Section: Methodsmentioning

confidence: 99%

“…), imazapic controlled purple nutsedge ≥95% and yellow nutsedge ≥92% (Grichar and Nester 1997;Grichar et al 2012;Webster et al 1997). But variability in yellow and purple nutsedge control for this rate has also been reported, ranging from 39 to 93% in peanut (Dotray and Keeling 1997;Wehtje and Brecke 2004).…”

mentioning

confidence: 98%

Purple Nutsedge (Cyperus rotundus) Tuber Production and Viability Are Reduced by Imazapic

2016

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Weeds exploit underutilized space, causing economic losses in cropping systems. Weed management tactics alter that underutilized space until the crop can mature and efficiently use that space. One tactic is to reduce the weed propagules (e.g., seeds and tubers) that persist quiescently in the soil, which includes minimizing production and addition of new propagules to the soil. Purple nutsedge is a problematic weed around the globe, persisting between growing seasons as tubers in the soil. Imazapic is a peanut herbicide often used in Georgia for control of purple nutsedge. The objective of the experiment was to evaluate the effect of various rates of imazapic on purple nutsedge tuber production. Single presprouted purple nutsedge tubers were transplanted into outdoor microplots and treated after 6 wk of growth with six rates of imazapic (5 to 140 g ai ha −1 ) POST. A nontreated control was included. All emerged shoots at the time of application were marked with plastic rings; this allowed for classification of tubers at exhumation as (1) tubers attached to shoots that were emerged at time of application, (2) tubers attached to shoots that emerged after application, and (3) tubers without an aerial shoot during the study. At 7 wk after application, the tubers in the microplots were exhumed, classified, and quantified, and their ability to sprout was evaluated. In the nontreated control, there were 544 total tubers, with a log-logistic regression model describing the declining tuber population with increasing imazapic rate. The rate of imazapic that reduced total tuber population 50% (I 50 ) was 36 g ha −1. In the nontreated control, there were 161 tubers attached to shoots that emerged, as when compared with plots that received an imazapic application that had an I 50 = 60 g ha −1. Viability of purple nutsedge tubers was 44% at 70 g ha −1 imazapic, suggesting the action of the herbicide may have rendered the tubers nonviable after new shoots were produced. The final classification of tubers included those that did not have an aerial shoot during the study. These were tubers in which apical dominance suppressed shoot development or were likely the most recent tubers to develop. Of the three classes, the tubers without shoots were the most prevalent in the nontreated control, with 358 tubers and an I 50 = 18 g ha −1. Imazapic controls purple nutsedge foliage but also reduces the number of new tubers produced, and overall tuber viability and is a valuable tool in management of the long-term population density of this weed. Nomenclature: Imazapic, purple nutsedge, Cyperus rotundus L., CYPRO.

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Nutsedge (Cyperusspp.) Control in Peanut (Arachis hypogaea) with AC 263,222 and Imazethapyr

Cited by 38 publications

References 14 publications

Diclosulam for Weed Control in Texas Peanut1

Diclosulam for Weed Control in Texas Peanut1

Weed Control and Peanut Tolerance with Ethalfluralin-Based Herbicide Systems

Purple Nutsedge (Cyperus rotundus) Tuber Production and Viability Are Reduced by Imazapic

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