Wheat (<i>Triticum aestivum</i>) Cultivar Tolerance and Italian Ryegrass (<i>Lolium multiflorum</i>) Control with Diclofop, BAY SMY 1500, and Metribuzin

Shaw, David R.; Wesley, Michael T.

doi:10.1017/s0890037x00033844

Cited by 16 publications

(32 citation statements)

References 15 publications

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“…In our case, the crop also showed excellent tolerance to both pre-mixes when applications were made at Z21-23 stages which represent the tillering stage of wheat, and may be attributed to the enhanced capacity of wheat plants to metabolise the herbicides at these stages (Das, 2014). The differential sensitivity of wheat to metribuzin applied at its different growth stages (Shaw & Wesley, 1991;Grey & Bridges, 2003) and different doses (Balyan, 1999) has been demonstrated earlier.…”

Section: Discussionmentioning

confidence: 80%

“…Dhawan et al (2010) and Kaur et al (2016) reported development of cross resistance in P. minor to pinoxaden in Punjab and Haryana states. Metribuzin is primarily a soil-residual herbicide, which can be applied post-emergence to wheat for the control of annual grasses and dicot weeds (Schroeder et al, 1986;Shaw & Wesley, 1991). Although metribuzin can control P. minor effectively, careful management, including timely application is required to achieve good crop tolerance and weed control (Runyan et al, 1982;Schroeder et al, 1986).…”

Section: Introductionmentioning

confidence: 99%

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Growth stage of Phalaris minor Retz. and wheat determines weed control and crop tolerance of four post-emergence herbicides

Rasool

Bhullar

Gill

2017

Span. j. agric. res.

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Phalaris minor Retz. has evolved multiple herbicide resistance in wheat growing areas in northwestern India. An understanding of the effect of growth stage on herbicide tolerance of wheat and control of P. minor will help in selecting the most appropriate herbicide for different situations. The weed control and crop safety of four commonly used wheat herbicides (sulfosulfuron, pinoxaden, fenoxaprop plus metribuzin and mesosulfuron plus iodosulfuron), each applied at four different wheat growth stages was investigated in field studies for two years. P. minor plants were at 1, 2-3, 3-4 and 7-8 leaf stages when the herbicides were applied at Zadok 12-Z12, Z13, Z21 and Z23 stages of wheat, respectively. Sulfosulfuron application at Z12 and Z13 wheat stages (before first irrigation), provided >80% control of P. minor and produced wheat grain yield (4.5-4.7 t/ha) similar to the weed-free check (4.9 t/ha) in both years. Pinoxaden, fenoxaprop plus metribuzin and mesosulfuron plus iodosulfuron application at Z12 and Z13 wheat stages recorded significantly lower wheat grain yield (3.62-3.95 t/ha) due to poor weed control, crop toxicity or both. All the four herbicides were equally effective on P. minor when applied at Z21 wheat stage. At Z23 wheat stage, pinoxaden gave >90% control of P. minor and the highest wheat grain yield (4.82 t/ha). The results are expected to allow changes in the current recommendation of the timing of postemergence herbicides for the management of P. minor in wheat.Additional key words: crop toxicity; crop stages; littleseed canarygrass; selectivity; Triticum aestivum.Correspondence should be addressed to Rubia Rasool: rubiarasool@yahoo.com; rasiarasool@gmail.com Abbreviations used: ALS (acetolactate synthase); DAS (days after sowing); DAT (days after treatment); Z (Zadoks).

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Section: Discussionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Growth stage of Phalaris minor Retz. and wheat determines weed control and crop tolerance of four post-emergence herbicides

Rasool

Bhullar

Gill

2017

Span. j. agric. res.

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“…Injury from the early-spring metribuzin application was only temporary, probably due to rapid wheat growth during March, while injury from the fall application timings continued to be apparent months after application (Tables 2 and 3). Shaw and Wesley (1991) observed ≤6% injury for fourteen soft red wheat cultivars planted in silt clay soils when sprayed with metribuzin in early February. Higher levels of wheat injury were observed in a separate study conducted on sandy loam soils, and the authors attributed these differences to changes in the soil type.…”

Section: Resultsmentioning

confidence: 86%

Effect of Application Timing on Winter Wheat Response to Metribuzin

2017

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Metribuzin will control many problematic weed species in winter wheat in the mid-Atlantic states, including herbicide-resistant biotypes, but it has not been recommended due to crop safety concerns. In a three-year trial, metribuzin was applied at 105 or 210 g ai ha −1 to wheat at the PRE, 2-leaf (Feekes stage 1 to 2), early spring (Feekes stage 3 to 4), and late spring (Feekes stage 4 to 6) growth stages using wheat cultivars sensitive to metribuzin. Early spring applications had the least amount of injury, and injury at this timing was transient and yield was not reduced. Yield loss was observed with the other application timings in at least one out of three years. Rainfall shortly after application appears to increase the risk of wheat injury. Nomenclature: metribuzin, wheat, Triticum aestivum L. Key words: Crop safety, herbicide injury.Metribuzin controlará muchas especies de malezas problemáticas en trigo de invierno en los estados del Atlántico medio, incluyendo biotipos resistentes a herbicidas, pero no ha sido recomendado debido a preocupación sobre su seguridad en el cultivo. En un ensayo durante tres años, se aplicó metribuzin a 105 ó 210 g ai ha −1 al trigo en los estadios de crecimiento PRE, 2-hojas (estadios Feekes 1 a 2), temprano en la primavera (estadios Feekes 3 a 4), y tarde en la primavera (estadios Feekes 4 a 6) usando cultivares de trigo sensibles a metribuzin. Las aplicaciones temprano en la primavera tuvieron la menor magnitud de daño, y el daño en este momento de aplicación fue temporal y el rendimiento no se redujo. Se observó pérdida en el rendimiento con otros momentos de aplicación en uno de los tres años. Eventos de lluvia poco después de las aplicaciones parecen aumentar el riesgo de daño en el trigo.Soft red winter wheat is grown on over 300,000 ha in the Mid-Atlantic region of the United States (USDA 2015). Winter wheat in this region provides a fall-planted crop that increases the diversity of farmers' rotations. Also, the ability to plant soybean [Glycine max (L.) Merr.] immediately after wheat harvest in this region allows for an additional grain marketing opportunity.Winter annual weeds, both broadleaf and grass species, are problematic for small grains. Farmers in the mid-Atlantic region have successfully used acetolactate synthase (ALS)-inhibiting herbicides since early 1990s as their mainstay for weed control. As a result, there has been a shift towards species that are not effectively controlled with this herbicide family, such as henbit (Lamium amplexicaule L.), ivyleaf speedwell (Veronica hederifolia L.), and annual bluegrass (Poa annua L.) (BA Scott, personal observation). In addition, there are confirmed ALS-resistant biotypes of common chickweed [Stellaria media (L.)Vill.], Italian ryegrass (Lolium perenne L. ssp. multiflorum (Lam.) Husnot), and horseweed [Conyza canadensis (L.) Cronq.]. The prevalence of these species has forced farmers to seek alternative herbicides for small grain production.Metribuzin is an herbicide that may improve small grain weed control for g...

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“…While metribuzin can control Italian ryegrass effectively, careful management, including cultivar selection and timely application, is required to achieve acceptable crop tolerance and weed control. Many agronomically desirable, high-yielding wheat cultivars are sensitive to metribuzin and cannot be planted if metribuzin is to be applied and some cultivars are extremely sensitive [31][32][33]. Bromoxynil in wheat will control wild radish but is ineffective on Italian ryegrass.…”

Section: Photosystem II Herbicidesmentioning

confidence: 99%

“…Previous research indicated that metribuzin reduced yield demonstrating the risks growers take when using this herbicide for weed control [16,31,33].…”

Section: Crop Response and Weed Controlmentioning

confidence: 99%

Winter Wheat Response to Weed Control and Residual Herbicides

Grey¹,

Newsom²

2017

Wheat Improvement, Management and Utilization

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Italian ryegrass has become one of the most common and troublesome weeds of wheat production in the Southern United States. There are multiple reports in this region of Italian ryegrass herbicide resistance to acetyl-CoA carboxylase (ACCase), acetolactate synthase (ALS), and glyphosate herbicides. One commonality for Italian ryegrass resistance in this area is that most of these mechanisms of action for these herbicides are all postemergence (POST) applied. In order to have profitable soft red winter wheat production, applications of preemergence (PRE) herbicides with residual control of Italian ryegrass and other winter weed species would benefit growers. There are a very limited number of herbicides that can be applied at the time of wheat planting, primarily only when pyroxasulfone is registered for this timing. Research was conducted to establish weed control information when herbicides were applied to soft red winter wheat PRE, at wheat emergence (AE), or POST at Feekes stages 1.0-1.9, depending on herbicide label recommendations. Injury from any pyroxasulfone PRE treatments up to 120 g a.i. ha −1 was transient and did not affect wheat yield for any experiment. Italian ryegrass control was variable depending on location and year. Susceptible and diclofop-resistant Italian ryegrass control was 86% or greater with pyroxasulfone at 60 g a.i. ha −1 and greater with applied PRE. Italian ryegrass control was variable ranging from 27 to 49% with pendimethalin ME-applied PRE, diclofop at Feekes sage 1.0, and pinoxaden applied at Feekes stage 1.9.

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Wheat (Triticum aestivum) Cultivar Tolerance and Italian Ryegrass (Lolium multiflorum) Control with Diclofop, BAY SMY 1500, and Metribuzin

Cited by 16 publications

References 15 publications

Growth stage of Phalaris minor Retz. and wheat determines weed control and crop tolerance of four post-emergence herbicides

Growth stage of Phalaris minor Retz. and wheat determines weed control and crop tolerance of four post-emergence herbicides

Effect of Application Timing on Winter Wheat Response to Metribuzin

Winter Wheat Response to Weed Control and Residual Herbicides

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