scholarly journals Quizalofop-p-ethyl Mixed with Synthetic Auxin and ACCase-Inhibiting Herbicides for Weed Management in Rice Production

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Eric P. Webster ◽  
Samer Y. Rustom ◽  
Benjamin M. McKnight ◽  
David C. Blouin ◽  
Gustavo M. Teló
Keyword(s):  
Weed Management ◽  
Production Systems ◽  
Rice Production ◽  
Weedy Rice ◽  
Red Rice ◽  
Synthetic Auxin

A study was conducted near Crowley, Louisiana, to evaluate the efficacy of quizalofop-p-ethyl mixed with different synthetic auxin and ACCase-inhibiting herbicides for barnyardgrass and weedy rice control in rice production systems. Quizalofop was applied at 0 or 120 g ai·ha−1 mixed with 2,4-D at 1336 g ai·ha−1, triclopyr at 282 g ai·ha−1, quinclorac at 420 g ai·ha−1, cyhalofop-butyl at 314 g ai·ha−1, or fenoxaprop-p-ethyl at 122 g ai·ha−1. Cyhalofop, fenoxaprop, 2,4-D, quinclorac, and triclopyr antagonized quizalofop for barnyardgrass control at 14 days after treatment (DAT). At 28 DAT, an antagonistic response persisted for barnyardgrass control, except when cyhalofop was mixed with quizalofop, which indicated a neutral response. Red rice, CLXL-745, and CL-111 control decreased due to antagonism of quizalofop when mixed with 2,4-D. However, quinclorac, triclopyr, cyhalofop, or fenoxaprop mixed with quizalofop resulted in a neutral response for red rice, CLXL-745, and CL-111 control at 28 DAT.

Modeling the Simultaneous Evolution of Resistance to ALS- and ACCase-Inhibiting Herbicides in Barnyardgrass (Echinochloa crus-galli) in Clearfield®Rice

2014 ◽  
Vol 28 (1) ◽  
pp. 89-103 ◽  
Author(s):  
Muthukumar V. Bagavathiannan ◽  
Jason K. Norsworthy ◽  
Kenneth L. Smith ◽  
Paul Neve
Keyword(s):  
Weed Management ◽  
Key Management ◽  
Production Systems ◽  
Acetolactate Synthase ◽  
Rice Production ◽  
Management Scenarios ◽  
Management Options ◽  
Evolution Of Resistance ◽  
Clearfield Rice ◽  
Simultaneous Evolution

Herbicide-resistant barnyardgrass has become widespread in the rice production systems of the midsouthern United States, leaving few effective herbicide options for controlling this weed. The acetolactate synthase (ALS)- and acetyl-CoA carboxylase (ACCase)-inhibiting herbicides remain largely effective in Clearfield®rice production, but strategies need to be developed to protect the long-term utility of these options. A two-trait model was developed to understand simultaneous evolution of resistance in barnyardgrass to the ALS- and ACCase-inhibiting herbicides in Clearfield rice. The model was used to predict resistance under a number of common weed management scenarios across 1,000 hypothetical rice fields in the Mississippi Delta region and answer some key management questions. Under an ALS inhibitor–only program consisting of three annual applications of imidazolinone herbicides (imazethapyr or imazamox) in continuous Clearfield rice, resistance was predicted within 4 yr with 80% risk by year 30. Weed management programs that consisted of ALS- and ACCase-inhibiting herbicides such as fenoxaprop and cyhalofop greatly reduced the risk of ALS-inhibiting herbicide resistance (12% risk by year 30), but there was a considerable risk for ACCase resistance (evolving by year 14 with 13% risk by year 30) and multiple resistance (evolving by year 16 with 11% risk by year 30) to both of these mechanisms of action. A unique insight was that failure to stop using a herbicide soon after resistance evolution can accelerate resistance to the subsequent herbicide option. Further, a strong emphasis on minimizing seedbank size is vital for any successful weed management strategy. Results also demonstrated that diversifying management options is not just adequate, but diversity combined with timely herbicide applications aimed at achieving high efficacy levels possible is imperative.

Dormancy-linked Population Structure of Weedy Rice (Oryza sp.)

Weed Science ◽  
2018 ◽  
Vol 66 (3) ◽  
pp. 331-339 ◽  
Author(s):  
Te-Ming Tseng ◽  
Vinod K. Shivrain ◽  
Amy Lawton-Rauh ◽  
Nilda R. Burgos
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Seed Dormancy ◽  
Weed Management ◽  
Production Systems ◽  
Gene Diversity ◽  
Weedy Rice ◽  
Cultivated Rice ◽  
Simple Sequence

AbstractSeed dormancy allows weedy rice (Oryza sp.) to persist in rice production systems. Weedy and wild relatives of rice (Oryza sativa L.) exhibit different levels of dormancy, which allows them to escape weed management tactics, increasing the potential for flowering synchronization, and therefore gene flow, between weedy Oryza sp. and cultivated rice. In this study, we determined the genetic diversity and divergence of representative dormant and nondormant weedy Oryza sp. groups from Arkansas. Twenty-five simple sequence repeat markers closely associated with seed dormancy were used. Four populations were included: dormant blackhull, dormant strawhull, nondormant blackhull, and nondormant strawhull. The overall gene diversity was 0.355, indicating considerable genetic variation among populations in these dormancy-related loci. Gene diversity among blackhull populations (0.398) was higher than among strawhull populations (0.245). Higher genetic diversity was also observed within and among dormant populations than in nondormant populations. Cluster analysis of 16 accessions, based on Nei’s genetic distance, showed four clusters. Clusters I, III, and IV consisted of only blackhull accessions, whereas Cluster II comprised only strawhull accessions. These four clusters did not separate cleanly into dormant and nondormant populations, indicating that not all markers were tightly linked to dormancy. The strawhull groups were most distant from blackhull weedy Oryza sp. groups. These data indicate complex genetic control of the dormancy trait, as dormant individuals exhibited higher genetic diversity than nondormant individuals. Seed-dormancy trait contributes to population structure of weedy Oryza sp., but this influence is less than that of hull color. Markers unique to the dormant populations are good candidates for follow-up studies on the control of seed dormancy in weedy Oryza sp.

scholarly journals Interactive Effect of Weeding Regimes, Rice Cultivars, and Seeding Rates Influence the Rice-Weed Competition under Dry Direct-Seeded Condition

2020 ◽  
Vol 13 (1) ◽  
pp. 317
Author(s):  
Sharif Ahmed ◽  
M. Jahangir Alam ◽  
Akbar Hossain ◽  
A. K. M. Mominul Islam ◽  
Tahir H. Awan ◽  
...  
Keyword(s):  
Weed Management ◽  
Oryza Sativa L ◽  
Interactive Effect ◽  
Rice Production ◽  
Weedy Rice ◽  
Rice Grain ◽  
Rice Cultivars ◽  
Seeding Rate ◽  
Direct Seeded ◽  
Hybrid Cultivar

Dry direct-seeded rice (Oryza sativa L.), a climate-smart and resource-efficient (labor and water) rice production technology is gaining popularity in many parts of Asian countries; however, weeds are the major constraints for its early establishment and optimum productivity. Chemical weed management is effective, rapid, and also decreases weed management costs in dry direct-seeded rice (DSR) system; however, chemical use for weed management have a negative effect on the environment and also have human health hazards. Therefore, integrated weed management (IWM) is the best option for the sustainability of rice production under the DSR system. Improving competitiveness against weeds, weed-competitive rice cultivars, and high seeding rates were found to be the most promising IWM strategies in DSR. In this context, a field study was conducted to evaluate the weed competitiveness of rice cultivars and seeding rates on the performance of aus rice in dry direct-seeded systems in Bangladesh. Three inbred rice cultivars (CV), namely “BRRI dhan26”, “BRRI dhan48”, and “BRRI dhan55”, and one hybrid cultivar, “Arize” were tested in a seeding rate (SR) of 20, 40, and 80 kg ha−1 under two weeding regimes (WR) of weed-free and partially-weedy. Rice grain yield was strongly affected (p < 0.01) by the interactions of WR, CV, and SR. In weed-free conditions, the yield of all three inbred cultivars was increased up to SR of 40 kg ha−1 and for the hybrid cultivar, up to SR of 20 kg ha−1, and with further increment of SR, there was no yield advantage. Conversely, under partially weedy conditions, the yield of three inbred cultivars increased up to SR of 80 kg ha−1; however, for the hybrid cultivar, this increment was up to SR of 40 kg ha−1 and thereafter, no yield gain. In weedy conditions, the higher SR compensates for the yield losses by increasing the competitiveness of rice with weeds. Across SR, the hybrid cultivar had a significantly (p < 0.01) higher weed competitive index (WCI) than all the inbred cultivars and the highest SR always had a higher WCI.

Stakeholder and field surveys on weed issues and research needs in rice production in Texas

2020 ◽  
pp. 1-9
Author(s):  
Rui Liu ◽  
Vijay Singh ◽  
Xin-Gen Zhou ◽  
Muthukumar Bagavathiannan
Keyword(s):  
Weed Management ◽  
Management Practices ◽  
Rice Production ◽  
Rice Fields ◽  
Weedy Rice ◽  
Research Needs ◽  
Field Surveys ◽  
Herbicide Resistant ◽  
Late Season ◽  
Hemp Sesbania

Abstract A paper-based survey was conducted from 2015 to 2017 among stakeholders of the Texas rice industry on current weed management challenges and factors influencing management decisions. A total of 108 survey questionnaires were completed by stakeholders at the rice Cooperative Extension meetings conducted in the rice-growing counties of Texas. In addition, late-season field surveys were conducted prior to harvest in 2015 and 2016 across the rice-growing counties to understand dominant weed escapes occurring in rice fields. Results from the questionnaire survey revealed that rice–fallow–rice was the most common rotation practiced in Texas rice production. Echinochloa spp., Leptochloa spp., and Cyperus spp. were the top three problematic weed issues faced by the respondents. Among the Leptochloa species, Nealley’s sprangletop, a relatively new species in rice fields, was indicated as an emerging concern. Clomazone was the most frequently used PRE herbicide, whereas quinclorac, propanil, imazethapyr, and cyhalofop were the popular POST herbicides. Most respondents (72%) made weed-control decisions on the basis of economic thresholds, whereas 63% made decisions on the basis of weed problems from previous years. Most respondents (88%) expressed moderate to high concern for herbicide-resistant weeds in their operations. Strategies to manage herbicide-resistant weeds and economical weed management practices were among the top suggested research needs. The field survey revealed that jungle rice, Nealley’s sprangletop, and hemp sesbania were the top three late-season weed escapes in rice production in Texas, with frequencies of occurrence of 28%, 19%, and 13%, respectively. Furthermore, average field area infested by a species was the greatest for jungle rice (13%), followed by hemp sesbania (11%) and weedy rice (11%). Findings from the stakeholder and field surveys help direct future research and outreach efforts for sustainable weed management in Texas rice.

Weedy Rice: An Emerging Threat for Direct-seeded Rice Production Systems in India

2013 ◽  
Vol 01 (01) ◽  
Author(s):  
Kanwar Singh ◽  
Virender Kumar ◽  
Yashpal S Saharawat ◽  
Mahesh Gathala
Keyword(s):  
Production Systems ◽  
Rice Production ◽  
Weedy Rice ◽  
Direct Seeded

Mixture Interactions of Quizalofop and Reduced Rates of Halosulfuron

2021 ◽  
pp. 1-24
Author(s):  
L. Connor Webster ◽  
Eric P. Webster ◽  
David C. Blouin ◽  
Benjamin M. McKnight
Keyword(s):  
Field Study ◽  
Rice Production ◽  
Weedy Rice ◽  
Research Station ◽  
Red Rice ◽  
Antagonistic Interaction ◽  
The Impact ◽  
Low Rate ◽  
Mixture Interactions

A field study was conducted in 2017 and 2018 at the LSU Agricultural Center H. Rouse Caffey Rice Research Station (RRS) near Crowley, LA. to evaluate the impact of reduced rates of halosulfuron on quizalofop activity in Louisiana rice production. Halosulfuron and a prepackaged mixture of halosulfuron plus thifensulfuron were evaluated at 0, 17, 35, or 53 g ai ha−1 and 34 or 53 g ai ha−1, respectively, in a mixture with quizalofop at 120 g ai ha-1. Control of (%) of barnyardgrass and red rice as well as two non-ACCase resistant rice lines, CL-111 and CLXL-745, were recorded at 14 and 28 d after treatment (DAT). The red rice, CL-111, and CLXL-745 represented a weedy rice population. Across all species evaluated at 14 DAT, all halosulfuron and halosulfuron plus thifensulfuron containing mixtures resulted in antagonism with an observed control of 79 to 90%, compared to an expected control of 96 to 99%. At 28 DAT, all halosulfuron containing mixtures resulted in neutral interactions for barnyardgrass control. Quizalofop mixed with halosulfuron plus thifensulfuron at the lower rate of 34 g ha−1 was able to overcome the antagonism compared with the higher rate of 53 g ha−1 for barnyardgrass control at 28 DAT. Both the high and the low rate of halosulfuron plus thifensulfuron resulted in antagonistic interaction for red rice, CL-111, and CLXL-745 control at 28 DAT. This research suggests that mixing quizalofop with halosulfuron plus thifensulfuron should be avoided, especially at the higher rate of 53 g ha−1.

scholarly journals Genetic Identity Based on Whole-Genome SNP Array Data of Weedy Rice in Nagano, Japan

Agronomy ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 472 ◽  
Author(s):  
Wenjing Bi ◽  
Jian Sun ◽  
Jun Hosoi ◽  
Masaharu Aoki ◽  
Nagao Sakai ◽  
...  
Keyword(s):  
Weed Management ◽  
Production System ◽  
Large Scale ◽  
Management Practices ◽  
Oryza Sativa L ◽  
Snp Array ◽  
Rice Production ◽  
Weedy Rice ◽  
Whole Genome ◽  
Population Genetic Analysis

The rice production system in Japan is changing due to the aging of rice farmers, shortage of labor, mechanization, and increase of large-scale rice fields and increased application of direct sowing, all of which contribute to the lack of sophisticated weed management practices. Because the changing production system has not improved and likely worsened weed management practices, weedy rice (Oryza sativa L.) has become a serious threat to rice production in Japan. We analyzed weedy rice accessions from Nagano, the central part of Japan, and other rice accessions to elucidate the origin of this weedy rice using a whole-genome single nucleotide polymorphism (SNP) array. For developing sustainable weedy rice management practices, the elucidation of the origin of re-emerging weedy rice is crucial. Population genetic analysis indicated that weedy rice in Nagano was phylogenetically independent from the local red rice cultivar with low genetic diversity. Past and recently re-emerging weedy rice ecotypes in Nagano shared a similar genetic background which implies the evolution of weedy rice by severe natural selection. Window-based FST and selection sweep analysis revealed the divergence of some of the known key domestication-related genes, such as shattering gene sh4 and qsh1, of weedy rice from domesticated rice cultivars.

scholarly journals Efficacy of fall-applied residual herbicides on weedy rice control in rice (Oryza sativa L.)

2019 ◽  
Vol 33 (03) ◽  
pp. 441-447
Author(s):  
Matthew B. Bertucci ◽  
Michael Fogleman ◽  
Jason K. Norsworthy
Keyword(s):  
Field Experiments ◽  
Production Systems ◽  
Oryza Sativa L ◽  
Residual Activity ◽  
High Rate ◽  
Weedy Rice ◽  
Red Rice ◽  
Cultivated Rice ◽  
Winter Condition ◽  
Split Plot

AbstractField experiments were initiated near Colt, AR, in the fall of 2016 and continued through the summer of 2018 to evaluate rice tolerance and weedy (or red) rice control after fall-applied very-long-chain fatty acid (VLCFA)-inhibiting herbicides. A split-plot design was used for the experiment, with the whole-plot factor being winter condition (flooded or non-flooded) and the split-plot factors being herbicide and rate. Herbicide treatments included acetochlor, dimethenamid-P, pethoxamid, pyroxasulfone, andS-metolachlor applied at 1,050, 525, 420, 205, and 1,070 g ai ha−1and at 2,100, 1,050, 840, 410, and 2,140 g ha−1for low rates and high rates, respectively. Herbicides were applied in the fall, then ‘CL172’ rice was drill seeded in the spring of the following calendar year. Weedy rice control differed between years, but acetochlor and pyroxasulfone consistently provided the greatest levels of control across rates and flood conditions. Consequently, herbicides that best controlled weedy rice also caused the greatest injury to cultivated rice. Rice injury did not exceed 13% regardless of herbicide treatment at 3 wk after planting (WAP). However, the high rate of pyroxasulfone caused 20% rice injury at 5 WAP in 2018. Although it was expected that winter condition may affect residual activity of the VLCFA-inhibiting herbicides, herbicide selection and application rate both had much greater effects on rice injury and on weedy rice control. Based on these results, rice injury would be minimal or nonexistent after fall applications of the tested VLCFA inhibitors, and intermediate levels of weedy rice control may be achieved. The implementation of VLCFA-inhibiting herbicides in rice production systems would offer a novel herbicide site of action and offer a degree of selective control of weedy rice.

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