ANTAGONISM IS THE PREDOMINANT EFFECT OF HERBICIDE MIXTURES USED FOR IMIDAZOLINONE-RESISTANT BARNYARDGRASS (Echinochloa crus-galli) CONTROL

ABSTRACTHerbicides mixtures are used in many situations without the adequate knowledge related with the effect on major target weeds. The objective of this study was to evaluate the effects of different herbicides mixtures used in irrigated rice in order to establish the adequate combinations for the prevention and management of herbicide resistance in barnyardgrass (Echinochloa crus-galli). Three experiments were performed at field conditions with all major post-emergent herbicides used in irrigated rice in Brazil. The first experiment was performed with barnyardgrass resistant to imidazolinone herbicides and herbicides applied at label rates. The second and third experiments were performed with barnyardgrass resistant and susceptible to imidazolinone herbicides applied at doses of 50 or 75% of the label rates. The occurrence of additive, synergistic and antagonistic effects was identified at 18, 18 and 64%, respectively, among the total of 50 different associations of herbicide and rates evaluated. In general, the mixture of ACCase inhibitors with ALS inhibitors, quinclorac, clomazone + propanil or thiobencarb resulted in antagonism. Sinergic mixtures were found in clomazone with propanil + thiobencarb, profoxydim with cyhalofop-butyl or clomazone, and quinclorac with imazapyr + imazapic, bispyribac-sodium or cyhalofop-butyl. The mixtures of quinclorac with profoxydim were antagonic. Rice grain yield varied according to the efficiency of weed control. Seveveral mixtures were effective for imidazolinone resistant barnyardgrass control.

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Comparison of Weed Management Programs for Furrow-Irrigated and Flooded Hybrid Rice Production in Arkansas

Weed Technology ◽

10.1614/wt-d-11-00065.1 ◽

2011 ◽

Vol 25 (4) ◽

pp. 556-562 ◽

Cited By ~ 5

Author(s):

Muthukumar V. Bagavathiannan ◽

Jason K. Norsworthy ◽

Robert C. Scott

Keyword(s):

Weed Control ◽

Weed Management ◽

Field Experiments ◽

Rice Production ◽

Production Costs ◽

Yield Reduction ◽

Rice Grain ◽

Irrigated Rice ◽

Grain Yields ◽

Herbicide Programs

Whether season-long weed control can be achieved in a furrow-irrigated rice system with similar herbicide inputs to that of a flooded system is not known. Field experiments were conducted in 2007 and 2008 at Pine Tree, AR to evaluate different herbicide programs on the weed control efficacy and rice grain yield in furrow-irrigated and flooded rice production systems. Six herbicide programs were evaluated with and without additional late-season “as-needed” herbicide treatments. Minor injury to rice was noted for quinclorac plus propanil. However, the injury was transient and the plants fully recovered. Overall weed control was greater in the flooded system compared with the furrow-irrigated system (up to 20% greater), because flooding effectively prevented the emergence of most terrestrial weeds. In addition, rice grain yields were 13 to 14% greater in flooded compared with furrow-irrigated plots. Irrespective of the irrigation system, herbicide programs that contained a PRE-applied herbicide provided greater weed control and resulted in greater yield compared with those that did not contain PRE-applied herbicide, indicative of the importance of early-season weed control in achieving higher grain yields. On the basis of weed control, yield, and weed treatment cost, the herbicide program with clomazone PRE followed by propanil at four- to five-leaf rice was more efficient than other programs evaluated in both irrigation systems. However, furrow-irrigated plots required as-needed herbicide applications, which were applied after the four- to five-leaf rice stage when two or more plots within a program exhibited ≤ 80% control for any of the weed species. This suggests that furrow-irrigated rice production demands additional weed management efforts and thereby increases production costs. There is also a possibility for substantial yield reduction in the furrow-irrigated system compared with the flooded system. Nevertheless, furrow-irrigated rice production can still be a viable option under water-limiting situations and under certain topographic conditions.

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Interaction between saflufenacil and imazapyr+imazapic in the management of barnyardgrass and weedy rice and selectivity for irrigated rice

Ciência Rural ◽

10.1590/0103-8478cr20190821 ◽

2020 ◽

Vol 50 (7) ◽

Author(s):

Ânderson da Rosa Feijó ◽

Marcus Vinicius Fipke ◽

Luiza Piccinini Silveira ◽

Edinalvo Rabaioli Camargo ◽

Nelson Diehl Kruse ◽

...

Keyword(s):

Weed Control ◽

Field Experiments ◽

Rice Cultivar ◽

Weedy Rice ◽

Rice Cultivars ◽

Irrigated Rice ◽

Growing Seasons ◽

Herbicide Treatments ◽

Imidazolinone Herbicides ◽

Chemical Groups

ABSTRACT: The use of imidazolinone-tolerant rice cultivars allows selective control of weedy rice and barnyardgrass. However, in many situations, there is a need to add herbicides from other chemical groups to increase the spectrum of weed control. In this sense, saflufenacil has the potential to be used in mixture with imidazolinone herbicides. This study aimed to evaluate the interaction effects of the imazapyr+imazapic and saflufenacil herbicides in weedy rice and barnyardgrass and to investigate their impacts on the yield of the irrigated rice cultivar Puitá INTA CL. To reach these aims, greenhouse and field experiments were carried out during two growing seasons, with herbicide treatments sprayed separately and in mixtures of saflufenacil with imazapyr+imazapic. Results showed that saflufenacil did not interfere with control of weedy rice and barnyardgrass obtained with imazapyr+imazapic. The D50 values of imazapyr+imazapic for weedy rice control were 14.5+5, 9.1+3 and 12.5+4.2 g ha-1of imazapyr+imazapic for combinations with 0, 3.06 and 6.12 g ha-1of saflufenacil, respectively. In the field experiments, all doses of imazapyr+imazapic applied isolated or in mixture with saflufenacil provided control levels barnyardgrass above 90% at 28 days after herbicides application. Furthermore, saflufenacil did not cause damage or loss in the yield of the rice crop when mixed with imazapyr+imazapic. The Puitá INTA CL rice cultivar was tolerant of the tested herbicides, whether applied alone or in mixture, reaching grain yield of 9.987 kg ha-1 when applied 42 g ha-1 of saflufenacil plus 147+49 g ha-1 of imazapyr+imazapic.

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Leaching and residual activity of imidazolinone herbicides in lowland soils

Ciência Rural ◽

10.1590/0103-8478cr20160705 ◽

2017 ◽

Vol 47 (5) ◽

Cited By ~ 5

Author(s):

João Paulo Refatti ◽

Luis Antonio de Avila ◽

José Alberto Noldin ◽

Igor Pacheco ◽

Rodrigo Ribeiro Pestana

Keyword(s):

Oryza Sativa L ◽

Residual Activity ◽

Underground Water ◽

Soil Samples ◽

Treatment Control ◽

Irrigated Rice ◽

Leaching Potential ◽

Phytotoxic Activity ◽

Lowland Area ◽

Imidazolinone Herbicides

ABSTRACT: Herbicides used in the Clearfield® rice (Oryza sativa L.) production system have a potential for leaching. This can result in contamination of underground water resources and cause injury to not tolerant crops that are sown in a succession and/or crop rotation. The objective of this study was to determine the leaching potential and the residual activity of the herbicides used in the Clearfield® rice system. The experiment was conducted over a period of two years and consisted of conducting a field test to be followed by two bioassays with a year of difference between their implementation. Initially an experiment was conducted in lowland area where it was planted the cultivar of rice ‘PUITA INTA CL’. Approximately one and two years thereafter, soil samples from each plot were collected at intervals of 5cm to a depth of 30cm (B factor) for the bioassay to evaluate persistence of herbicides. Factor A was composed of mixtures formulated of imazethapyr + imazapic (75 + 25g a.i. L-1), imazapyr + imazapic (525 + 175g a.i. kg-1) in two doses, imazethapyr (100g a.i. L-1) and treatment control without application. Basing on results, it was concluded that the mixtures imazethapyr + imazapic, imazapyr + imazapic and imazethapyr leached into the soil, reaching depths of up to 25cm in lowland soil. Imidazolinone herbicides used today in the irrigated rice Clearfield® system are persistent in soil, and their phytotoxic activity can be observed up to two years after application.

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Globe fringerush (Fimbristylis miliacea) cross resistance to als-inhibitor herbicides under field conditions in irrigated rice in the south of Brazil

Planta Daninha ◽

10.1590/s0100-83582013000400016 ◽

2013 ◽

Vol 31 (4) ◽

pp. 893-902 ◽

Cited By ~ 3

Author(s):

C.E. Schaedler ◽

J.A. Noldin ◽

D.S. Eberhardt ◽

D. Agostinetto ◽

N.R. Burgos

Keyword(s):

Grain Yield ◽

Weed Control ◽

Rice Fields ◽

Field Conditions ◽

Cross Resistance ◽

Herbicide Application ◽

The South ◽

Santa Catarina ◽

Irrigated Rice ◽

South Of Brazil

ALS-inhibiting herbicides usually provide adequate weed control in irrigated rice fields. After consecutive years of use, the Cyperaceae species, globe fringerush (Fimbristylis miliacea) began to show resistance to ALS (acetolactate synthase) inhibitors. Globe fringerush is one of the most problematic herbicide-resistant weeds in irrigated rice in the state of Santa Catarina in the South of Brazil. The objective of this research was to examine cross resistance of globe fringerush to ALS inhibitors, under field conditions. Two experiments were conducted in a rice field naturally infested with ALS-resistant globe fringerush in Santa Catarina, in the 2008/09 and 2009/10 cropping seasons. The experimental units were arranged in randomized complete block design, with five replicates, consisting of two factors (herbicide and dose) in a 4 x 5 factorial arrangement. ALS herbicides included bispyribac-sodium, ethoxysulfuron, pyrazosulfuron-ethyl and penoxsulam. Six-leaf globe fringerush was sprayed with herbicide doses of 0, 0.5, 1, 2 and 4X the recommended doses in a spray volume of 200 L ha-1. The number of rice culm, filled and sterile grains, plant height, dry shoot biomass and grain yield were recorded. Globe fringerush control was evaluated 28 and 70 days after herbicide application (DAA); shoots were harvested at 13 weeks after herbicide application and dry weight recorded. Competition with globe fringerush reduced the number of culm and rice grain yield. The globe fringerush biotype in this field was resistant to all ALS herbicides tested. Penoxsulam had the highest level of activity among treatments at 28 and 70 DAA, but the control level was only 50% and 42%, respectively, in the second year of assessment. This was not enough to prevent rice yield loss. Alternative herbicides and weed control strategies are necessary to avoid yield losses in rice fields infested with ALS-resistant biotypes of globe fringerush.

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Residual Activity of ACCase-Inhibiting Herbicides on Monocot Crops and Weeds

Weed Technology ◽

10.1017/wet.2018.13 ◽

2018 ◽

Vol 32 (4) ◽

pp. 364-370 ◽

Cited By ~ 1

Author(s):

Zachary D. Lancaster ◽

Jason K. Norsworthy ◽

Robert C. Scott

Keyword(s):

Weed Control ◽

Field Experiments ◽

Residual Activity ◽

Sprinkler Irrigation ◽

Grain Sorghum ◽

Rainfall Event ◽

Rice Grain ◽

Acetyl Coa Carboxylase ◽

Herbicide Treatments ◽

Residual Control

AbstractField experiments were conducted in 2014 and 2015 in Fayetteville, Arkansas, to evaluate the residual activity of acetyl-CoA carboxylase (ACCase)–inhibiting herbicides for monocot crop injury and weed control. Conventional rice, quizalofop-resistant rice, grain sorghum, and corn crops were evaluated for tolerance to soil applications of six herbicides (quizalofop at 80 and 160 g ai ha–1, clethodim at 68 and 136 g ai ha–1, fenoxaprop at 122 g ai ha–1, cyhalofop at 313 g ai ha–1, fluazifop at 210 and 420 g ai ha–1, and sethoxydim at 140 and 280 g ai ha–1). Overhead sprinkler irrigation of 1.3 cm was applied immediately after treatment to half of the plots, and the crops planted into the treated plots at 0, 7, and 14 d after herbicide treatment. In 2014, injury from herbicide treatments increased with activation for all crops evaluated, except for quizalofop-resistant rice. At 14 d after treatment (DAT) in 2014, corn and grain sorghum were injured 19% and 20%, respectively, from the higher rate of sethoxydim with irrigation activation averaged over plant-back dates. Conventional rice was injured 13% by the higher rate of fluazifop in 2014. Quizalofop-resistant rice was injured no more than 4% by any of the graminicides evaluated in either year. In 2015, a rainfall event occurred within 24 h of initiating the experiment; thus, there were no differences between activation via irrigation or by rainfall. However, as in 2014, grain sorghum and corn were injured 16% and 13%, respectively, by the higher rate of sethoxydim, averaged over plant-back dates. All herbicides provided little residual control of grass weeds, mainly broadleaf signalgrass and barnyardgrass. These findings indicate the need to continue allowing a plant-back interval to rice following a graminicide application, unless quizalofop-resistant rice is to be planted. The plant-back interval will vary by graminicide and the amount of moisture received following the application.

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Evaluation of Herbicide Options for Alligatorweed (Alternanthera philoxeroides) Control in Rice

Weed Technology ◽

10.1614/wt-d-14-00164.1 ◽

2015 ◽

Vol 29 (4) ◽

pp. 793-799 ◽

Cited By ~ 1

Author(s):

Samuel D. Willingham ◽

Muthukumar V. Bagavathiannan ◽

Katherine S. Carson ◽

Todd J. Cogdill ◽

Garry N. McCauley ◽

...

Keyword(s):

United States ◽

Weed Control ◽

Field Studies ◽

Rice Production ◽

Alternanthera Philoxeroides ◽

Southern United States ◽

Rice Grain ◽

Effective Management ◽

Invasive Weed ◽

Antagonistic Interactions

Alligatorweed is a perennial, invasive weed in southern United States rice production, but knowledge on effective management of this weed is limited, especially in conventional (non-imidazolinone-resistant) rice fields. Field studies were conducted in multiple environments in southeastern Texas to evaluate different herbicide options involving penoxsulam, propanil, triclopyr, halosulfuron, bispyribac-sodium, bensulfuron, and quinclorac for alligatorweed control in conventional drill-seeded rice when applied at early POST (EPOST), late POST (LPOST), or both. Among the herbicide options evaluated, penoxsulam alone (up to 83%), penoxsulam plus triclopyr (up to 87%), or bispyribac-sodium plus triclopyr (92%) provided superior alligatorweed control. Plots treated with penoxsulam plus triclopyr EPOST produced the highest yields (9,550 kg ha−1), which were comparable to plots receiving penoxsulam plus triclopyr LPOST (9,320 kg ha−1), penoxsulam alone EPOST (9,280 kg ha−1), and penoxsulam plus halosulfuron LPOST (9,180 kg ha−1). Considering both weed control and rice grain yields, penoxsulam plus triclopyr applied EPOST was found to be the best option among the treatments tested. The treatments bensulfuron alone, bensulfuron plus propanil, penoxsulam plus propanil, triclopyr plus propanil, and bispyribac-sodium plus propanil provided poor (≤ 65%) alligatorweed control. Results also suggest the likelihood for antagonistic interactions when tank-mix combinations tested in this study included propanil.

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Effect of AC 263,222, Imazethapyr, and Nicosulfuron on Weed Control and Imidazolinone-Tolerant Corn (Zea mays) Yield

Weed Technology ◽

10.1017/s0890037x00040860 ◽

1996 ◽

Vol 10 (4) ◽

pp. 822-827 ◽

Cited By ~ 9

Author(s):

C. Dale Monks ◽

John W. Wilcut ◽

John S. Richburg ◽

Joseph H. Hatton ◽

Michael G. Patterson

Keyword(s):

Zea Mays ◽

Weed Control ◽

Application Rate ◽

Field Corn ◽

Pitted Morningglory ◽

Dry Conditions ◽

Ac 263,222 ◽

Imidazolinone Herbicides ◽

Commercial Field

Imidazolinone herbicides injure currently available commercial field corn cultivars; however, cultivars resistant to these herbicides have been developed. Sicklepod, Texas panicum, and annual morningglory control using AC 263,222 (36 and 72 g ai/ha), imazethapyr (36 and 72 g ai/ha), or nicosulfuron (35 g ai/ha) applied POST at 2,4, and 6 wk after planting were evaluated in imidazolinone-tolerant corn. Studies were conducted at Attapulgus and Plains, Georgia from 1992 through 1993. Nicosulfuron and AC 263,222 at 72 g/ha controlled Texas panicum at least 87% when applied 2 wk after planting. Imazethapyr did not consistently control Texas panicum or sicklepod, regardless of application rate. AC 263,222 at both rates and nicosulfuron controlled sicklepod at least 86% when applied 2 wk after planting; however, later application or application under dry conditions generally resulted in reduced control. All herbicides controlled the entireleaf and pitted morningglory complex at least 84% when applied 2 wk after planting. Imidazolinone-tolerant corn was tolerant to all herbicides, regardless of rate and timing, and generally yielded greater when weeds were controlled early in the season.

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Herbicide Choice and Timing for Weed Control in Imidazolinone-Resistant Lentil

Weed Technology ◽

10.1614/wt-d-11-00079.1 ◽

2011 ◽

Vol 25 (4) ◽

pp. 620-625 ◽

Cited By ~ 6

Author(s):

L. K. Fedoruk ◽

S. J. Shirtliffe

Keyword(s):

Weed Control ◽

Poor Control ◽

Early Application ◽

Application Timing ◽

Wild Mustard ◽

Green Foxtail ◽

Imidazolinone Herbicides ◽

Grass Weed ◽

Residual Control ◽

Control Equivalent

Conventional lentil, because it is relatively noncompetitive, requires effective weed control. In conventional lentil, metribuzin should be applied by the four-node stage to avoid crop injury. This is earlier than the critical period of weed control (CPWC) of lentil, which is between the five- and 10-node stage. However, imidazolinone herbicides potentially can be applied later in imidazolinone-resistant lentil, which might allow lentil to be kept weed-free for the CPWC. The objective of this experiment was to determine the best herbicide choice and application timing necessary to achieve the CPWC in lentil. To do this we tested herbicides differing in efficacy and residual control. The herbicides imazethapyr/imazamox, imazamox, and metribuzin + sethoxydim were applied at the two- and six-node lentil stage. Of the three herbicide treatments, metribuzin + sethoxydim resulted in grain yield that was on average 31% lower than the other herbicides. This occurred because of greater broadleaf biomass (composed primarily of wild mustard) in lentils treated with these herbicides regardless of application timing. Because of this, the CPWC was not attained with metribuzin + sethoxydim. Late applications of imazethapyr/imazamox or imazamox resulted in grain yields 30% higher than with early application of these herbicides. Early applications of the imidazolinone herbicides gave poor control of grass weeds (wild oat and green foxtail), but late applications resulted in grass weed control equivalent to metribuzin + sethoxydim. Imazethapyr/imazamox or imazamox should be applied at the five- to six-node stage of lentil to achieve the CPWC.

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Effect of herbicides and herbicide mixtures on weeds in wheat

Indian Journal of Agricultural Research ◽

10.18805/ijare.v50i2.9587 ◽

2016 ◽

Vol 50 (2) ◽

Author(s):

Dhirender Choudhary ◽

P. K. Singh ◽

N. K. Chopra ◽

S. C. Rana

Keyword(s):

Triticum Aestivum ◽

Weed Control ◽

Harvest Index ◽

Dry Weight ◽

Field Investigation ◽

Weed Density ◽

Metsulfuron Methyl ◽

Weed Control Efficiency ◽

Herbicide Mixtures ◽

Hand Weeding

A field investigation was carried out to evaluate the effect of herbicides and their mixtures on weeds in wheat (<italic>Triticum aestivum</italic> L.) cv. PBW-343. Minimum weed density per m2 and weed dry weight (5.13 and 17.31g) was recorded with sulfosulfuron at 25g ha−1 followed by clodinofop at 60g + metsulfuron methyl at 4g ha−1 (5.19 and 18.45g), metribuzin at 200gha−1(5.85 and 25.98g), pendimethalin at 1000g fb 2,4-Dat400g ha−1 (6.49 and 31.73g) and hand weeding twice(7.01 and 35g), respectively. Also, maximum weed control efficiency was recorded under sulfosulfuron at 25g ha−1 (83.85%) followed by clodinofop at 60g + metsulfuron methyl at 4g ha−1 (83.17%) and metribuzin at 200g ha−1 (75.85%), respectively. All the weed control treatments recorded significantly higher harvest index than the weedy check (40.24). Among various herbicidal treatments, application of clodinofop at 60g + metsulfuron methyl at 4g ha−1 recorded highest harvest index (41.91) followed by sulfosulfuron at 25 gha−1 (41.83) and pendimethalin at 1000g fb2,4-Dat 400gha−1 (41.25) respectively. The harvest index recorded under clodinofop at 60g + metsulfuron methyl at 4g ha−1 and sulfosulfuron at 25 g ha−1 was significantly at par with weed free (42.06).

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Bio-Efficacy of different tank mix herbicides for weed control in soybean [Glycine max (L.) Merrill]

Legume Research - An International Journal ◽

10.18805/lr-4009 ◽

2018 ◽

Author(s):

Jai Prakash Bhimwal ◽

Arvind Verma ◽

Virendra Nepalia ◽

Versha Gupta

Keyword(s):

Weed Control ◽

Cynodon Dactylon ◽

Cyperus Rotundus ◽

Control Treatment ◽

Yield Attributes ◽

Commelina Benghalensis ◽

Trianthema Portulacastrum ◽

Glycine Max L ◽

Herbicide Mixtures ◽

Quizalofop Ethyl

A field experiment was conducted at the Rajasthan College of Agriculture, MPUAT, Udaipur during Kharif season 2015 and 2016 to adjudge the efficacy of different herbicide and herbicide mixtures against weeds in soybean. Monocot weeds were predominant (55.15%) in the experimental field compared with dicot weeds (44.85%). However, Echinochloa colona (41.56%) and Trianthema portulacastrum (33.16%) were predominant in soybean but, other weeds (Cyperus rotundus, Cynodon dactylon, Commelina benghalensis, Digera arvensis, Amaranthus viridis, Physalis minima, Corchorus spp.) were also present at 60 DAS. Among different weed control treatments, post-emergence and tank mix combination of propaquizafop + imazethapyr (75+75 g ha-1) and imazethapyr + quizalofop-ethyl (75+60 g ha-1) at 21 DAS were most effective in respect of reducing weed density, weed biomass, nutrient removal by weed and promote yield attributes and yield and quality of soybean as compared to rest of weed control treatment.

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