Imazethapyr plus Propanil Mixtures in Imidazolinone-Resistant Rice

2017 ◽  
Vol 32 (1) ◽  
pp. 45-51 ◽  
Author(s):  
Eric P. Webster ◽  
Gustavo M. Teló ◽  
David C. Blouin ◽  
Benjamin M. McKnight
Keyword(s):  
Rice Yield ◽  
Red Rice ◽  
Single Application ◽  
Antagonistic Interaction ◽  
Synergistic Response ◽  
Hemp Sesbania

AbstractA study was conducted in three locations in Louisiana to evaluate interactions of imazethapyr at 0 and 70 g ai ha−1mixed with propanil at 0, 1,120, 2,240, 3,360, and 4,480 g ha−1for the control of red rice, barnyardgrass, and hemp sesbania. According to Blouin’s modified Colby’s, a synergistic response occurred for red rice treated with imazethapyr mixed with propanil at 4,480 g ha−1for all evaluations. Observed control was 93% to 95% compared with expected control of 81% to 87%. An antagonistic response occurred for barnyardgrass control with imazethapyr mixed with propanil at 1,120 g ha−1at 35 and 49 d after treatment (DAT), with control of 75% and 64%, respectively, compared with expected control of 89% and 78%. However, a neutral response occurred for barnyardgrass control when treated with all other imazethapyr plus propanil combinations. An antagonistic interaction occurred for hemp sesbania when treated with imazethapyr plus propanil at 3,360 and 4,480 g ha−1at 21 DAT with an observed control of 89% compared with an expected control of 96%; however, a neutral response occurred at all other evaluation dates. An increase in rice yield was observed with an imazethapyr plus propanil at 4,480 g ha−1mixture compared with a single application of imazethapyr or propanil at any rate evaluated.

Potential Use of Imazethapyr Mixtures in Drill-Seeded Imidazolinone-Resistant Rice

2004 ◽  
Vol 18 (4) ◽  
pp. 1037-1042 ◽  
Author(s):  
Kristie J. Pellerin ◽  
Eric P. Webster ◽  
Wei Zhang ◽  
David C. Blouin
Keyword(s):  
Rice Yield ◽  
Red Rice ◽  
Hemp Sesbania ◽  
Potential Use

The efficacy of imazethapyr in drill-seeded imidazolinone-resistant rice was evaluated in Louisiana in 2000 and 2001. Imazethapyr was applied preemergence (PRE), or no PRE, followed by a postemergence (POST) application of imazethapyr alone, or in a mixture with bensulfuron, bentazon plus aciflurofen, carfentrazone, halosulfuron, propanil plus molinate, triclopyr, or V-10029. Imazethapyr applied PRE followed by a POST application of imazethapyr controlled barnyardgrass equivalent to or higher than other treatments evaluated. Red rice control at 35 days after postemergence treatment (DAT) was 66 to 81% with imazethapyr applied PRE followed by any POST application, but a reduction in control was observed with a POST application of imazethapyr. Although alligatorweed control increased with POST applications, these treatments suggested only suppression. Hemp sesbania control never exceeded 10% with imazethapyr-only treatments and at 35 DAT, all POST applications, except bensulfuron, increased control above 84%. Rice yield increased with treatments receiving a PRE application of imazethapyr compared with no imazethapyr applied PRE.

Rice and red rice interference. II. Rice response to population densities of three red rice (Oryza sativa) ecotypes

Weed Science ◽  
2005 ◽  
Vol 53 (5) ◽  
pp. 683-689 ◽  
Author(s):  
Leopoldo E. Estorninos ◽  
David R. Gealy ◽  
Edward E. Gbur ◽  
Ronald E. Talbert ◽  
Marilyn R. McClelland
Keyword(s):  
Aboveground Biomass ◽  
Growth Response ◽  
Field Experiments ◽  
Rice Yield ◽  
Rice Cultivar ◽  
Growth And Yield ◽  
Red Rice ◽  
Population Densities ◽  
Rice Growth ◽  
Tiller Density

Red rice, which grows taller and produces more tillers than domestic rice and shatters most of its seeds early, is a major weed in many rice-growing areas of the world. Field experiments were conducted at Stuttgart, AR in 1997 and 1998 to evaluate the growth response of the Kaybonnet (KBNT) rice cultivar to various population densities of three red rice ecotypes. The ecotypes tested were Louisiana3 (LA3), Stuttgart strawhull (Stgstraw), and Katy red rice (KatyRR). Compared with KBNT alone, LA3, the tallest of the three red rice ecotypes, reduced tiller density of KBNT 51%, aboveground biomass at 91 d after emergence (DAE) 35%, and yield 80%. Stgstraw, a medium-height red rice, reduced KBNT tiller density 49%, aboveground biomass 26%, and yield 61%. KatyRR, the shortest red rice, reduced KBNT tiller density 30%, aboveground biomass 16%, and yield 21%. Tiller density of rice was reduced by 20 to 48% when red rice density increased from 25 to 51 plants m−2. Rice biomass at 91 DAE was reduced by 9 and 44% when red rice densities were 16 and 51 plants m−2. Rice yield was reduced by 60 and 70% at red rice densities of 25 and 51 plants m−2, respectively. These results demonstrate that low populations of red rice can greatly reduce rice growth and yield and that short-statured red rice types may affect rice growth less than taller ecotypes.

Glufosinate-Resistant, BAR-Transformed Rice (Oryza sativa) and Red Rice (Oryza sativa) Response to Glufosinate Alone and in Mixtures

1997 ◽  
Vol 11 (4) ◽  
pp. 662-666 ◽  
Author(s):  
Sujatha Sankula ◽  
Michael P. Braverman ◽  
Steven D. Linscombe
Keyword(s):  
Oryza Sativa ◽  
Seed Weight ◽  
Rice Plant ◽  
Rice Yield ◽  
Field Studies ◽  
The Other ◽  
First Year ◽  
Red Rice ◽  
Second Year ◽  
100 Seed Weight

Glufosinate applied postemergence alone and in mixture with pendimethalin, thiobencarb, quinclorac, propanil, bensulfuron, bentazon, acifluorfen, or triclopyr was evaluated on bialaphosresistant (BAR) rice and red rice in field studies. Glufosinate at 2.2 kg ai/ha alone was less phytotoxic (6%) to BAR-transformed rice than when it was applied in combination with 0.4 kg ai/ha triclopyr (59%) or 0.6 kg ai/ha acifluorfen (22%). Rice yield with glufosinate alone was similar to the weed-free check the first year, but 13% less than the weed-free check the second year. For the glufosinate plus triclopyr mixture, rice yield was reduced by 39 and 76% compared with glufosinate alone in 1994 and 1995, respectively. Red rice control was 92% with either 3.4 kg ai/ha propanil or 0.6 kg/ha acifluorfen mixed with 0.6 kg/ha glufosinate, which was greater than for glufosinate alone and the other combinations. Propanil or acifluorfen mixed with glufosinate reduced red rice plant height, panicle maturity, and 100-seed weight 16, 31, and 24%, respectively, compared to glufosinate alone and 30, 48, and 43%, respectively, compared to the nontreated weedy check.

Barnyardgrass (Echinochloa crus-galli) Control with Postemergence Applications of Propanil and Clomazone in Dry-Seeded Rice (Oryza sativa)

1998 ◽  
Vol 12 (3) ◽  
pp. 537-541 ◽  
Author(s):  
David L. Jordan ◽  
J. Andrew Kendig
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Field Experiments ◽  
Rice Yield ◽  
Rice Grain ◽  
Single Application ◽  
Consistent Increase ◽  
Better Than

Field experiments were conducted to compare barnyardgrass control and rice grain yield following a single postemergence (POST) application of propanil plus clomazone with single or repeat POST applications of propanil alone or single POST applications of propanil plus pendimethalin, molinate, quinclorac, or thiobencarb. In four of 10 experiments, propanil plus clomazone controlled barnyardgrass better than single or repeat applications of propanil alone or single applications of propanil plus pendimethalin, molinate, quinclorac, or thiobencarb. The most consistent increase in rice yield over a single application of propanil occurred where clomazone was applied in mixture with propanil.

Use of Imazosulfuron in Herbicide Programs for Drill-Seeded Rice (Oryza sativa) in the Mid-South United States

2011 ◽  
Vol 25 (4) ◽  
pp. 548-555 ◽  
Author(s):  
Dilpreet S. Riar ◽  
Jason K. Norsworthy
Keyword(s):  
United States ◽  
Oryza Sativa ◽  
Weed Control ◽  
Rice Yield ◽  
Rice Production ◽  
Weed Species ◽  
Application Timing ◽  
Yellow Nutsedge ◽  
Hemp Sesbania ◽  
Herbicide Programs

Research was conducted in 2009 and 2010 to evaluate influence of imazosulfuron rate and application timing on weed control in drill-seeded rice at Stuttgart, AR, and to evaluate imazosulfuron-containing herbicide programs in drill-seeded rice at Keiser and Stuttgart, AR. Weed species evaluated included barnyardgrass, broadleaf signalgrass, hemp sesbania, and yellow nutsedge. Imazosulfuron applied at 224 and 336 g ai ha−1during PRE, early POST (EPOST), or preflood (PREFLD) growth periods provided similar control of all weeds. Imazosulfuron applied EPOST or PREFLD controlled hemp sesbania and yellow nutsedge ≥ 93% both years at 5 and 7 wk after planting (WAP), except in 2009 when hemp sesbania control was ≤ 79% at 7 WAP. In 2010, because of inadequate rainfall, hemp sesbania and yellow nutsedge control with PRE-applied imazosulfuron was ≤29% at 5 and 7 WAP. Imazosulfuron plus clomazone PRE followed by (fb) quinclorac plus propanil EPOST and imazosulfuron plus quinclorac EPOST fb thiobencarb plus propanil PREFLD programs controlled hemp sesbania and barnyardgrass (in at least two site-years), and yellow nutsedge and broadleaf signalgrass (in at least one site-year) greater than or equal to clomazone plus quinclorac PRE fb propanil plus halosulfuron PRELD (standard program). No rice injury was observed with any herbicide program. Rice yield with all imazosulfuron-containing herbicide programs (6,630 to 8,130 kg ha−1) was similar to the standard herbicide program (7,240 kg ha−1). Imazosulfuron in mixture with clomazone, propanil, or quinclorac can be incorporated into herbicide programs of mid-South rice production for the control of broadleaf weeds and sedges.

Weed Control Programs in Drill-Seeded Imidazolinone-Resistant Rice (Oryza sativa)

2006 ◽  
Vol 20 (4) ◽  
pp. 956-960 ◽  
Author(s):  
Wei Zhang ◽  
Eric P. Webster ◽  
Kristie J. Pellerin ◽  
David C. Blouin
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Weed Control ◽  
The Other ◽  
Rice Grain ◽  
Red Rice ◽  
Control Programs ◽  
Hemp Sesbania

A study was conducted to evaluate weed control with imazethapyr applied at different timings or a combination of timings with or without an early POST application of bensulfuron, bentazon plus aciflurofen, bispyribac, carfentrazone, halosulfuron, propanil plus molinate, or triclopyr in drill-seeded imidazolinone-resistant rice. Control of barnyardgrass, red rice, and alligatorweed was insufficient with imazethapyr at 87 g/ha PRE or at 53 g/ha late POST alone. Imazethapyr at 87 g/ha PRE followed by imazethapyr at 53 g/ha late POST controlled red rice 86% or greater but did not control hemp sesbania. The imazethapyr PRE followed by late POST combination was also weak on barnyardgrass and alligatorweed early in the season. The addition of an early POST application of the other herbicides to the imazethapyr combination improved overall weed control, especially hemp sesbania control. Among the early POST herbicides, bispyribac, carfentrazone, or propanil plus molinate were more effective in helping improve the overall weed control, resulting in better rice grain yield.

Imazamox Plus Propanil Mixtures for Grass Weed Management in Imidazolinone-Resistant Rice

2016 ◽  
Vol 30 (1) ◽  
pp. 29-35 ◽  
Author(s):  
J. Caleb Fish ◽  
Eric P. Webster ◽  
David C. Blouin ◽  
Jason A. Bond
Keyword(s):  
Weed Management ◽  
Management Strategy ◽  
Resistance Management ◽  
Red Rice ◽  
Modes Of Action ◽  
Synergistic Response ◽  
Overall Resistance ◽  
Grass Weed

A study was established to evaluate interactions between imazamox at 0 and 44 g ai ha−1mixed with propanil at 0, 1,120, 2,240, 3,360, and 4,480 g ai ha−1for the control of red rice and barnyardgrass. Blouin's Modified Colby's procedure was used to test for interactions. At 7 d after treatment (DAT), a synergistic response occurred for red rice treated with imazamox at 44 g ha−1mixed with propanil at 3,360 and 4,480 g ha−1by increasing expected control of 62% to an observed control of 67 and 75%, respectively, and the synergistic response continued across all evaluations through 49 DAT. No antagonism occurred for any imazamox plus propanil mixture for red rice control. An antagonistic response was shown for barnyardgrass control with imazamox at 44 g ha−1mixed with any rate of propanil, at 7 DAT. However, imazamox plus propanil at 4,480 g ha−1resulted in a neutral response at 14 through 49 DAT. Rice treated with imazamox plus propanil at 4,480 g ha−1plus imazamox resulted in a yield of 6,640 kg ha−1. The synergistic response observed for red rice control with a mixture of imazamox plus propanil can benefit producers by increasing control of red rice, and this mixture contains two different modes of action that can be part of an overall resistance management strategy.

Imazethapyr Co-Application Interactions in Imidazolinone-Resistant Rice

2015 ◽  
Vol 29 (4) ◽  
pp. 689-696 ◽  
Author(s):  
John Caleb Fish ◽  
Eric P. Webster ◽  
David C. Blouin ◽  
Jason A. Bond
Keyword(s):  
Management Strategy ◽  
Resistance Management ◽  
Red Rice ◽  
Modes Of Action ◽  
Synergistic Response ◽  
Overall Resistance

A study was conducted to evaluate interactions of imazethapyr co-application with propanil, thiobencarb, or a prepackaged mixture of propanil plus thiobencarb. At 7, 14, 21, and 49 d after treatment (DAT), synergism occurred for red rice treated with imazethapyr at 70 g ai ha−1mixed with propanil plus thiobencarb at 1,680 and 3,360 g ai ha−1. A synergistic response was also observed with imazethapyr at 70 g ha−1mixed with propanil at 1,680 g ha−1; however, all other co-applications evaluated resulted in a neutral response with no antagonism observed. At 7 DAT, antagonism was observed for barnyardgrass when treated with imazethapyr at 70 g ha−1mixed with propanil plus thiobencarb at 1,680 g ha−1, propanil at 840 g ha−1, or thiobencarb at 840 and 1,680 g ha−1; however, a synergistic response occurred for barnyardgrass control at 14, 21, and 49 DAT with imazethapyr at 70 g ha−1mixed with propanil plus thiobencarb at 3,360 g ha−1. The synergistic response observed for red rice and barnyardgrass control with a mixture of imazethapyr plus propanil plus thiobencarb can benefit producers by increasing control of red rice and barnyardgrass, and this mixture contains three herbicides with three different modes of action, which can be part of an overall resistance-management strategy in imidazolinone-resistant (IR) rice.

Quizalofop-p-ethyl application in water-seeded coenzyme A carboxylase–inhibiting herbicide-resistant rice with different flood systems

2019 ◽  
Vol 34 (2) ◽  
pp. 188-192
Author(s):  
Eric P. Webster ◽  
Gustavo M. Teló ◽  
Samer Y. Rustom ◽  
Benjamin M. McKnight ◽  
David C. Blouin
Keyword(s):  
Coenzyme A ◽  
Rice Yield ◽  
Growth Stages ◽  
Research Station ◽  
Red Rice ◽  
Application Timing ◽  
Herbicide Resistant ◽  
Initial Application ◽  
Tiller Stage ◽  
The One

AbstractA field study was conducted during the 2016 and 2017 crop seasons at the LSU AgCenter H. Rouse Caffey Rice Research Station to evaluate weed control and rice yield after quizalofop-p-ethyl applications in water-seeded coenzyme A carboxylase (ACCase)–resistant ‘PVLO1’ long-grain rice production utilizing different flood systems, application timings, and quizalofop rates. The initial application of quizalofop was applied at five timings beginning when ‘PVLO1’ rice was at the coleoptile stage (PEG) through the one- to two-tiller stage. A total quizalofop rate of 240 g ai ha–1 was split into two applications: 97 followed by 143 g ha–1 or 120 followed by 120 g ai ha–1 in both pinpoint and delayed flood water-seeded management systems. A second quizalofop application was applied 14 d after initial treatment (DAIT). At 14 DAIT, a reduction in control of barnyardgrass and red rice was observed by delaying the initial quizalofop application to the two- to four-tiller stage compared with rice treated at earlier growth stages. At 42 DAIT, control of barnyardgrass was 94% to 96%, and red rice was 98% following the second application of quizalofop, regardless of initial application timing. Rice treated with quizalofop at the PEG and two- and three-leaf stage resulted in a rice height of 104 cm at harvest compared with 96 to 100 cm when the initial application of quizalofop was delayed to later growth stages. Applying the initial application of quizalofop to rice at the PEG timing in the pinpoint or the delayed flood system resulted in a total gross value per hectare of $450 and $590, respectively. Within each flood system, delaying the initial application of quizalofop to the one- to two-tiller stage resulted in a gross per-hectare value reduction of $100 ha-1 in the pinpoint flood and $110 ha-1 in the delayed flood.

Application Rate and Timing of Acifluorfen, Bentazon, Chlorimuron, and Imazaquin

1992 ◽  
Vol 6 (3) ◽  
pp. 526-534 ◽  
Author(s):  
Charles A. King ◽  
Lawrence R. Oliver
Keyword(s):  
Field Studies ◽  
Application Rate ◽  
Palmer Amaranth ◽  
Red Rice ◽  
Pitted Morningglory ◽  
Hemp Sesbania ◽  
Prickly Sida ◽  
Smooth Pigweed ◽  
Large Crabgrass

Data from field studies at Fayetteville, AR, were used to predict the herbicide rate needed to provide 70, 80, or 90% control of a weed based upon weed age. Reduced herbicide rates generally needed to be applied within 6 to 12 d after emergence to control weeds 90%. Reduced rates (280 g ai ha–1or less) of acifluorfen controlled hemp sesbania, smooth pigweed, Palmer amaranth, and pitted and entireleaf morningglory 90%. Bentazon at 350 to 650 g ai ha–1controlled common cocklebur and prickly sida 90%. Common cocklebur, smooth pigweed, and pitted morningglory were controlled 90% with chlorimuron at 2 to 5 g ai ha–1and imazaquin at 20 to 80 g ai ha–1. Prickly sida and hemp sesbania were controlled 90% with imazaquin at 70 g ha–1and chlorimuron at 6 g ha–1, respectively. Barnyardgrass, large crabgrass, red rice, and sicklepod were not controlled with reduced herbicide rates.

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