Verification and Distribution of Propanil-Resistant Barnyardgrass (<i>Echinochloa crus-galli)</i>in Arkansas

Carey, V. Frank; Hoagland, Robert E.; Talbert, Ronald E.

doi:10.1017/s0890037x00023496

Cited by 81 publications

(83 citation statements)

References 10 publications

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“…Barnyardgrass is a principle rice weed globally, along with other closely related Echinochloa species, and thrives in the flooded rice production system [5]. Barnyardgrass has evolved resistance to many common rice herbicides, including propanil [6], quinclorac [7], and clomazone [8]. Red rice has long been difficult to control due to physiological similarities between it and commercial rice varieties [9].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Quizalofop-Resistant Rice for Arkansas Rice Production Systems

Lancaster

Norsworthy

Scott³

2018

International Journal of Agronomy

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Due to the ongoing evolution of herbicide-resistant weeds, new technologies are needed to maintain effective levels of control. A new rice variety that will be resistant to quizalofop, an acetyl coenzyme A carboxylase-(ACCase-) inhibiting herbicide, is currently under development. With the anticipated launch of this technology in 2018, multiple experiments were conducted to determine effectiveness of the quizalofop-resistant rice system for common grass weed species found in Arkansas rice production. One hundred and twenty-six barnyardgrass populations were collected across Arkansas and treated with quizalofop at 80 g ai hato determine a baseline of response. All populations evaluated were effectively controlled (≥92%) by quizalofop, with only 13 populations resulting in lower than 98% control. A greenhouse and field trial were conducted to compare efficacy of quizalofop to currently labeled rice graminicides for control of common rice grass weeds. Results from the greenhouse experiment showed that quizalofop treatments resulted in greater efficacy of common grass weeds compared to cyhalofop or fenoxaprop. This was especially apparent at the larger grass growth stages. A field experiment conducted compared season-long weed control programs of quizalofop to fenoxaprop and cyhalofop. The quizalofop-containing treatments were no better than fenoxaprop and cyhalofop for barnyardgrass and broadleaf signalgrass control. Barnyardgrass and broadleaf signalgrass control were greater than 96% for all herbicide treatments. An additional field experiment was conducted to determine the best rate structure for sequential applications of quizalofop in rice. Sequential applications of quizalofop at 120 g ha −1 followed by 120 g ha −1 two weeks later resulted in the highest barnyardgrass and broadleaf signalgrass control. Likewise, applying the full seasonal use rate of 240 g ha −1 of quizalofop resulted in greater control compared to 200 and 160 g ha −1 . Results from this research indicate a strong benefit from quizalofop use in rice.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Quizalofop-Resistant Rice for Arkansas Rice Production Systems

Lancaster

Norsworthy

Scott³

2018

International Journal of Agronomy

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“…Hand weeding is complicated by the morphological similarity of rice and grassy weed seedlings (Moody, 1983). Herbicides have been proven effective in many cases (De Datta and Llagas, 1984), but intensive herbicide use can cause environmental contamination and the development of herbicide resistance (Carey et al, 1995; Fischer et al, 1993; Lemerle et al, 2001). Using competitive varieties to suppress weeds might substantially reduce herbicide use and labor costs, permitting weeds to be controlled with a single herbicide application or hand weeding.…”

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confidence: 99%

Cultivar Weed‐Competitiveness in Aerobic Rice: Heritability, Correlated Traits, and the Potential for Indirect Selection in Weed‐Free Environments

et al. 2006

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Forty rice (Oryza sativa L.) cultivars and breeding lines used in the International Rice Research Institute (IRRI) upland rice breeding program were evaluated in adjacent weed-free and weedy trials in aerobic soil conditions during the wet seasons of 2001, 2002, and 2003. The objectives of this study were to investigate genetic variability in weed suppression and yield and to identify traits that could be used as selection criteria for improved weed competitiveness. Correlations among and heritability (H) of agronomic traits and early vigor were estimated in weedy and weed-free trials. Regression analysis was performed to predict weedy yield and weed biomass. Cultivars differed widely in the growth of weed biomass they permitted (126-296 g m 22 ) and in yield under competition (0.5-2.5 Mg ha 21 ). Cultivar yield, duration, biomass, harvest index, height, and vegetative vigor under weed-free conditions were closely correlated with the same traits measured under weedy conditions. Weedy yield and weed biomass were both moderately heritable (H 5 0.55 and 0.38 for means estimated from single-year, three replicate trial, respectively) and genetically correlated with each other (r 5 20.84). Weed-free yield and vigor at two weeks after seeding (WAS) were moderately heritable (H 5 0.68 and 0.38 for means estimated from a single-year, three replicate trial, respectively) and were highly genetically correlated with weedy yield (r 5 1.00 and 0.88, respectively) and weed biomass (r 5 20.89 and 20.67, respectively). Vegetative vigor at two WAS and grain yield measured under weed-free conditions explained a combined 87% of cultivar variation in weedy yield and 40% in weed biomass. Indirect selection on these two traits was predicted to be efficient for improving yield under weed competition and weedsuppressive ability of aerobic rice.

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“…Losses of agriculture caused by weeds are about 5 to 10% in developed countries, while losses can be up to 20 to 30% in developing or emerging countries (FAO, 2006). problem that repeated use of the same chemicals, or chemicals with the same mode of action would lead to the selection and buildup of resistant pest populations (Carey et al, 1995;Daou and Talbert, 1999). We are facing the challenges on weed control with synthetic agro-chemicals such as emergence of weeds resistant to herbicides (Yuan et al, 2007;Llewellyn et al, 2009), and concerns about the side effects caused by herbicides in food, soil, ground water and atmosphere (Rial-Otero et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Screening and evaluation of herbicidal metabolites produced by Trichoderma spp.

Kuang¹,

Wang²,

Mao³

2016

Afr. J. Microbiol. Res.

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Laboratory bioassays were conducted to screen and evaluate the potential herbicidal metabolites produced by Trichoderma.longibrachiatum (Tr673), T. harzianum (Tr319), T. viride (Tr347) T. koningii (Tr324) and T. asperellum (Tr85) on inhibiting seed germination (SGe) and shoot/root growth (SGr/RGr) of seedlings of Porslane (Portulaca oleracea), Barnyardgrass (Echinochloa crus-galli), and Amaranthus retroflexus L. The culture filtrates generated from fermented liquids with each of the Trichoderma strains were diluted into 10 and 20% by adding sterilized water, which was then applied onto the weed seeds individually. The IR (%) of SGr/RGr of seedlings were significantly higher (P≤ 0.05) in the treatments with Tr673 culture filtrate generated from potato dextrose broth (PDB) for all treated weed seeds compared to those in the treatments generated from other culture media with Tr673 or Tr347. The IR (%) on SGe and SGr/RGr of seedlings in the treatment with Tr673 culture filtrate generated from PDB + 0.4% sodium glutamate were significantly higher (P≤ 0.05) than those generated from PDB alone. The result of the bioassay with the crude extract (62.5 mgˑL -1 ) generated from Tr673 culture filtrate showed a similar effect on decreasing the SGr/RGr rates (%) of the weeds and cucumber compared to those with the chemical herbicide-glyphosate.

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Verification and Distribution of Propanil-Resistant Barnyardgrass (Echinochloa crus-galli)in Arkansas

Cited by 81 publications

References 10 publications

Evaluation of Quizalofop-Resistant Rice for Arkansas Rice Production Systems

Evaluation of Quizalofop-Resistant Rice for Arkansas Rice Production Systems

Cultivar Weed‐Competitiveness in Aerobic Rice: Heritability, Correlated Traits, and the Potential for Indirect Selection in Weed‐Free Environments

Screening and evaluation of herbicidal metabolites produced by Trichoderma spp.

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