Velvet and Creeping Bentgrass Tolerance to Fenoxaprop

Henry, Gerald M.; Hart, Stephen E.

doi:10.21273/hortsci.39.7.1768

Cited by 12 publications

(15 citation statements)

References 5 publications

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“…Shim and Johnson (1992) noted sequential applications of fenoxaprop at 70 to 200 kg • ha -1 caused unacceptable injury to creeping bentgrass, and turf did not fully recover after 3 months compared with nontreated. Henry and Hart (2004) reported creeping bentgrass density was reduced up to 33% from the nontreated after sequential applications of fenoxaprop at 40 or 70 g • ha -1 , respectively.…”

Section: /Ha) ----------------------------------(%) -----------------mentioning

confidence: 91%

Seedling Tolerance of Cool-season Turfgrasses to Metamifop

Barreda

Yu²,

McCullough³

2013

horts

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Grassy weeds may reduce cool-season turfgrass establishment after seeding and herbicide use is often warranted. Field experiments were conducted to evaluate the tolerance of creeping bentgrass (Agrostis stolonifera L.), perennial ryegrass (Lolium perenne L.), and tall fescue (Festuca arundinacea Schreb.) to fenoxaprop and metamifop applications at 1, 2, 3, or 4 weeks after seeding (WAS). Creeping bentgrass groundcover was reduced from 34% to 71% at 8 WAS from the nontreated by fenoxaprop at 50 g a.i./ha and metamifop at 400 and 800 g a.i./ha at all application timings. Metamifop at 200 g·ha−1 reduced creeping bentgrass cover 10% to 18% from the nontreated at 8 WAS when applied 1, 2, or 3 WAS, but treatments at 4 WAS did not reduce cover. Perennial ryegrass treated with fenoxaprop and metamifop at 800 g·ha−1 at 1 WAS had cover reduced from the nontreated on two and one dates, respectively, whereas tall fescue cover was never reduced greater than 5% from the nontreated. Results suggest applications to creeping bentgrass should be delayed greater than 4 WAS for fenoxaprop at 50 g·ha−1, greater than 4 WAS for metamifop at 400 and 800 g·ha−1, and 3 WAS for metamifop at 200 g·ha−1. Additionally, fenoxaprop applications should be delayed 2 WAS for perennial ryegrass and tall fescue, whereas metamifop could be safely applied at all rates at 1 WAS.

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Section: /Ha) ----------------------------------(%) -----------------mentioning

confidence: 91%

Seedling Tolerance of Cool-season Turfgrasses to Metamifop

Barreda

Yu²,

McCullough³

2013

horts

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“…This procedure was conducted again 3 wk after sequential treatments. Previous research evaluated 3‐wk clipping production to describe turfgrass response to herbicides (Henry and Hart, 2004; Cooper et al, 2016). This methodology was chosen to accumulate more clipping biomass for ease of determining cultivar response differences to metamifop rate.…”

Section: Methodsmentioning

confidence: 99%

“…ha −1 exhibited color ratings of 2.6 to 2.9. Henry and Hart (2004) observed a 20 and 40% reduction in clipping weight 4 wk after treatment of ‘L‐93’ creeping bentgrass with fenoxaprop at 0.07 and 0.15 kg a.i. ha −1 , respectively.…”

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confidence: 99%

Tolerance of Bentgrass (Agrostis spp.) to Postemergence Applications of Metamifop

Cooper

Beck

Straw

et al. 2017

Intl Turfgrass Soc Res J

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Previous research indicates that metamifop may be an alternative for the control of bermudagrass (Cynodon spp. Rich.) in bentgrass (Agrostis spp. L.) with minimal phytotoxicity; however, only a few cultivars have been evaluated for tolerance. We hypothesize that bentgrass cultivars will respond differently to increasing rates of metamifop. Therefore, the objective of our research was to evaluate the tolerance of several bentgrass cultivars to sequential postemergence applications of metamifop. ‘L‐93’, ‘Penn A‐4’, ‘Penncross’, ‘Seaside II’, ‘Crystal Bluelinks’, and ‘T‐1’ creeping bentgrass (Agrostis stolonifera L.) and ‘SR 7200’ velvet bentgrass (Agrostis canina L.) were established in a greenhouse and sprayed with metamifop at 0, 200, 300, 400, and 500 g a.i. ha−1. Metamifop applications reduced 3‐wk clipping production and increased phytotoxicity of L‐93, Penn A‐4, and Penncross more than Seaside II, Crystal Bluelinks, T‐1, and SR 7200 3 and 6 wk after initial treatment. Seaside II, Crystal Bluelinks, T‐1, and SR 7200 exhibited good tolerance (≤26% phytotoxicity) to sequential applications of metamifop at 300 g a.i. ha−1. The same applications caused ≥47% phytotoxicity to the remaining cultivars. However, methods employed in this research may have affected the level of bentgrass phytotoxicity. Plants grown under greenhouse conditions are often more susceptible to herbicides and therefore exhibit higher levels of phytotoxicity. Furthermore, continuous defoliation indicative of golf course putting greens may stimulate leaf production, thereby reducing bentgrass phytotoxicity associated with metamifop applications. Consequently, additional research is warranted to evaluate the response of bentgrass cultivars maintained under putting green conditions to field applications of metamifop.

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“…Higgins et al (1987) reported that fenoxaprop at 0.06 and 0.13 lb/acre did not reduce creeping bentgrass color ratings below 4.5, while fluazifop at 0.09, 0.18, and 0.27 lb/acre reduced creeping bentgrass color ratings below 2.9 14 DAT. Henry and Hart (2004) observed a 20% and 40% reduction in clipping weight 4 weeks after treatment (WAT) of 'L-93' creeping bentgrass in response to fenoxaprop at 0.06 and 0.13 lb/acre. Reductions in turfgrass quality not only affect creeping bentgrass aesthetic appearance but may also reduce its competition, making it more susceptible to invasion from other weeds [e.g., annual bluegrass (Poa annua L.)] (Johnson, 1984;Turner et al, 1979).…”

Section: Unitsmentioning

confidence: 99%

Efficacy of Metamifop for the Control of Common Bermudagrass

Cooper

Beck

Straw

et al. 2016

hortte

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Metamifop is a postemergence aryloxyphenoxypropionic acid herbicide used for the control of annual and perennial grass weeds in cereal crops and rice (Oryza sativa L.). Previous research observed creeping bentgrass (Agrostis stolonifera L.) tolerance to applications of metamifop, suggesting utilization for the removal of encroaching bermudagrass (Cynodon Rich.) from creeping bentgrass putting greens with little to no phytotoxicity. Therefore, the objective of our research was to evaluate the efficacy of metamifop for common bermudagrass [Cynodon dactylon (L.) Pers.] control in a greenhouse environment. Experiments were conducted at the Plant and Soil Science greenhouse facility at Texas Tech University in Lubbock in 2011 and 2012. ‘Riviera’ and ‘Savannah’ common bermudagrass were seeded at 218 lb/acre into 4-inch square pots containing a soilless potting media on 26 Aug. 2011 and 14 Nov. 2011. Pots were allowed to mature in the greenhouse over a 3-month period where they were maintained at a height of 0.25 inches. Herbicide treatments were applied on 1 Dec. 2011 and 8 Feb. 2012 and consisted of metamifop at 0.18, 0.27, 0.36, or 0.45 lb/acre. A sequential application of each treatment was made on 22 Dec. 2011 and 29 Feb. 2012. A nontreated control was included for comparison. Clipping ceased after initial herbicide treatment and pots produced biomass for 3 weeks. Biomass above 0.25 inch was removed from each pot, dried, and weighed. This procedure was conducted again 3 weeks after sequential treatments. The rate of metamifop required to reduce bermudagrass growth 50% (GR50) was calculated 3 and 6 weeks after initial treatment (WAIT). Visual ratings of percent bermudagrass control were recorded weekly on a scale of 0% (no control) to 100% (completely dead bermudagrass). As metamifop rate increased, bermudagrass biomass decreased. The calculated GR50 at 3 WAIT for ‘Savannah’ and ‘Riviera’ was 0.19 and 0.14 lb/acre, respectively. Nontreated control pots exhibited 0% control and produced 0.59 to 0.83 g of biomass at 3 WAIT, regardless of cultivar. Metamifop at 0.27 to 0.45 lb/acre exhibited 96% to 100% bermudagrass control at 3 WAIT, regardless of cultivar. Bermudagrass subjected to those same treatments only produced 0.01 to 0.03 g of biomass at 3 WAIT, regardless of cultivar. The 0.18-lb/acre rate of metamifop exhibited only 9% control of ‘Savannah’ bermudagrass with 0.72 g of biomass collected, while ‘Riviera’ was controlled 41% with 0.38 g of biomass collected. The calculated GR50 at 6 WAIT for ‘Savannah’ and ‘Riviera’ was 0.13 and 0.14 lb/acre, respectively. Sequential applications of metamifop at 0.27 to 0.45 lb/acre completely controlled bermudagrass (100%) at 6 WAIT, while a sequential application at 0.18 lb/acre only controlled bermudagrass 8% to 19% at 6 WAIT, regardless of cultivar. Bermudagrass subjected to 0.18 lb/acre exhibited 0.48 to 0.56 g of biomass at 6 WAIT, regardless of cultivar. Metamifop shows potential as an alternative control option for common bermudagrass present within cool-season turfgrass species.

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Velvet and Creeping Bentgrass Tolerance to Fenoxaprop

Cited by 12 publications

References 5 publications

Seedling Tolerance of Cool-season Turfgrasses to Metamifop

Seedling Tolerance of Cool-season Turfgrasses to Metamifop

Tolerance of Bentgrass (Agrostis spp.) to Postemergence Applications of Metamifop

Efficacy of Metamifop for the Control of Common Bermudagrass

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