Bermudagrass suppression and goosegrass control in seashore paspalum turf

Lindsey, Alex J.; DeFrank, J.; Cheng, Zhao

doi:10.37855/jah.2020.v22i02.18

Cited by 2 publications

(7 citation statements)

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“…Investigation of topramezone at these rates on bermudagrass safety or D. ischaemum control have not been previously reported. Topramezone applied at 5 to 20 times higher rates than the current study and mixed with metribuzin injured bermudagrass greater than 50%, but the bermudagrass recovered to an acceptable injury level (≤30%) after 7 d in Hawaii (Lindsey et al 2019(Lindsey et al , 2020. Only one study has evaluated mesotrione in combination with metribuzin at rates similar to those in the current study.…”

Section: Preliminary Experiments Assessing Rates Of Topramezone and Mesotrionementioning

confidence: 45%

“…All treatments with metribuzin admixture had less maximum injury than topramezone alone at 6.1 g ha −1 . As of this writing, there are only three published experiments that evaluated combinations of topramezone with metribuzin (Kerr et al 2019b;Lindsey et al 2019Lindsey et al , 2020, but none evaluated topramezone rates as low as the current trials. Lindsey et al (2019Lindsey et al ( , 2020) evaluated topramezone at 10 to 12 g ha −1 with 100 g ha −1 metribuzin on seashore paspalum turf in Hawaii.…”

Section: Bermudagrass Responsementioning

confidence: 92%

“…As of this writing, there are only three published experiments that evaluated combinations of topramezone with metribuzin (Kerr et al 2019b;Lindsey et al 2019Lindsey et al , 2020, but none evaluated topramezone rates as low as the current trials. Lindsey et al (2019Lindsey et al ( , 2020) evaluated topramezone at 10 to 12 g ha −1 with 100 g ha −1 metribuzin on seashore paspalum turf in Hawaii. Kerr et al (2019b) evaluated topramezone at 12 g ha −1 mixed with metribuzin at 420 g ha −1 on bermudagrass turf in South Carolina.…”

Section: Bermudagrass Responsementioning

confidence: 92%

“…Currently, there are three papers that have been published evaluating topramezone plus metribuzin in turfgrass. Two evaluated the use of topramezone with or without metribuzin for common bermudagrass suppression and E. indica control in seashore paspalum (Paspalum vaginatum Sw.) (Lindsey et al 2019(Lindsey et al , 2020. Topramezone at 10 g ha −1 plus metribuzin at 100 g ha −1 was observed to control E. indica 90% to 100% (Lindsey et al 2020).…”

Section: Introductionmentioning

confidence: 91%

“…Two evaluated the use of topramezone with or without metribuzin for common bermudagrass suppression and E. indica control in seashore paspalum (Paspalum vaginatum Sw.) (Lindsey et al 2019(Lindsey et al , 2020. Topramezone at 10 g ha −1 plus metribuzin at 100 g ha −1 was observed to control E. indica 90% to 100% (Lindsey et al 2020). Kerr et al (2019aKerr et al ( , 2019b sought to reduce bermudagrass response to topramezone at 12 g ha −1 with or without metribuzin at 420 g ha −1 by immediate post-treatment irrigation.…”

Section: Introductionmentioning

confidence: 99%

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Differences in selectivity between bermudagrass and goosegrass (Eleusine indica) to low-rate topramezone and metribuzin combinations

Brewer

Askew

2021

Weed Sci

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Goosegrass [Eleusine indica (L.) Gaertn.] remains problematic for bermudagrass [Cynodon dactylon (L.) Pers.] turf managers due to the ineffective, selective control of mature plants with available POST herbicides and lack of sufficient residual activity from those herbicides to control seedling plants. Topramezone controls mature E. indica, but past efforts to suppress potential injury to bermudagrass turf have been inconsistent. We hypothesized that metribuzin at 210 g ai ha−1 in admixture with topramezone would improve bermudagrass tolerance while conserving mature E. indica control. In preliminary field studies, metribuzin mixed with topramezone at 1.2 or 2.5 g ae ha−1 applied twice at a 3-wk interval reduced bermudagrass injury and white discoloration compared to topramezone applied alone, but metribuzin did not safen bermudagrass to mesotrione. Topramezone at 3.7 g ha−1 plus 210 g ha−1 metribuzin applied twice at a 3-wk interval offered improved bermudagrass tolerance while it still controlled mature E. indica during fifteen field and two greenhouse studies in Virginia. This program offered a 10-fold decrease in suprathreshold duration of white-discoloration compared to topramezone alone at 6.1 g ha−1. Bermudagrass absorbed three times less radioactivity than E. indica at timings up to 48 h after treatment with 14C-topramezone. Bermudagrass also metabolized twice as much topramezone compared to E. indica at 48 h after treatment. Metribuzin reduced 14C absorption by approximately 25% in both species. These studies confirm the performance of a novel, low-dose topramezone plus metribuzin program for mature E. indica control in bermudagrass turf, and suggest that selectivity between bermudagrass and E. indica to topramezone is due to differential absorption and metabolism. The fact that metribuzin reduces topramezone absorption in both species suggests that it may help reduce bermudagrass phytotoxic response to topramezone, but its role in altering selectivity between bermudagrass and E. indica may be due to other factors.

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Section: Preliminary Experiments Assessing Rates Of Topramezone and Mesotrionementioning

confidence: 45%

Section: Bermudagrass Responsementioning

confidence: 92%

Section: Bermudagrass Responsementioning

confidence: 92%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Differences in selectivity between bermudagrass and goosegrass (Eleusine indica) to low-rate topramezone and metribuzin combinations

Brewer

Askew

2021

Weed Sci

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Influence of posttreatment irrigation timings and herbicide placement on bermudagrass and goosegrass (Eleusine indica) response to low-dose topramezone and metribuzin programs

2021

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Immediate, post-treatment irrigation has been proposed as a method to reduce hybrid bermudagrass [Cynodon dactylon (L.) Pers. x Cynodon transvaalensis Burtt Davy] phytotoxicity from topramezone. Immediate irrigation is impractical since it would take a turfgrass sprayer 10 to 15 minutes to cover an average golf course fairway or athletic field. There is also insufficient evidence regarding how post-treatment irrigation, immediate or otherwise, influences mature goosegrass [Eleusine indica (L.) Gaertn.] control from topramezone or low-dose topramezone plus metribuzin programs. We sought to investigate bermudagrass and E. indica response to immediate, 15-minute, and 30-minute post-treatment irrigation compared to no irrigation following topramezone at 12.3 g ae ha−1, the lowest labeled rate, or topramezone at 6.1 g ha−1 plus metribuzin at 210 g ai ha−1. We also evaluated placement of each herbicide and their combination on soil, foliage, and soil plus foliage to help elucidate the mechanisms involved in differential responses between species and herbicide mixtures. Responses were largely dependent on trial due to bermudagrass injury from high-dose topramezone being nearly eliminated by immediate irrigation in one trial and only slightly affected in another. When post-treatment irrigation was postponed for 15 or 30 minutes, topramezone alone injured bermudagrass unacceptably in both trials. Bermudagrass was injured less by low-dose topramezone plus metribuzin than by high-dose topramezone. All post-treatment irrigation timings reduced E. indica control compared to no post-treatment irrigation. The herbicide placement study suggested that topramezone control of E. indica is highly dependent on foliar uptake and phytotoxicity of both bermudagrass and E. indica is greater from topramezone than metribuzin. Thus, post-treatment irrigation likely reduces topramezone rate load with a concomitant effect on plant phytotoxicity of both species. Metribuzin reduced 21-d cumulative clipping wt and tiller production of plants, and this may be a mechanism by which it reduces foliar white discoloration from topramezone.

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Bermudagrass suppression and goosegrass control in seashore paspalum turf

Cited by 2 publications

References 0 publications

Differences in selectivity between bermudagrass and goosegrass (Eleusine indica) to low-rate topramezone and metribuzin combinations

Differences in selectivity between bermudagrass and goosegrass (Eleusine indica) to low-rate topramezone and metribuzin combinations

Influence of posttreatment irrigation timings and herbicide placement on bermudagrass and goosegrass (Eleusine indica) response to low-dose topramezone and metribuzin programs

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