Full TGIF Record # 309569
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Web URL(s):https://scisoc.confex.com/scisoc/2019am/meetingapp.cgi/Paper/118569
    Last checked: 12/03/2019
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Henry, Gerald M.; Tucker, Kevin; Brosnan, James T.; Breeden, Gregory K.
Author Affiliation:Henry: University of Georgia-Athens, Athens, GA; Tucker: Crop and Soil Sciences, University of Georgia-Athens, Athens, GA; Brosnan and Breeden: Department of Plant Sciences, University of Tennessee-Knoxville, Knoxville, TN
Title:Postemergence crabgrass (Digitaria spp.) control in bermudagrass (Cynodon spp.) with pinoxaden
Section:C05 turfgrass science
Other records with the "C05 turfgrass science" Section

Turfgrass pest management poster: Diseases, insects, weeds (includes student competition)
Other records with the "Turfgrass pest management poster: Diseases, insects, weeds (includes student competition)" Section
Meeting Info.:San Antonio, Texas: November 10-13, 2019
Source:ASA, CSSA and SSSA International Annual Meetings. 2019, p. 118569.
# of Pages:1
Publishing Information:[Madison, Wisconsin]: [American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America]
Keywords:TIC Keywords: Crabgrass control; Cynodon dactylon; Cynodon dactylon x Cynodon transvaalensis; Herbicide efficacy; Herbicide evaluation; Herbicide injury; Herbicide safety; Pinoxaden; Postemergence weed control
Cultivar Names:TifTuf; Yukon
Abstract/Contents:"Crabgrass (Digitaria spp.) is a common summer annual weed of bermudagrass (Cynodon spp.) on golf courses, athletic fields, and home lawns. Pinoxaden is a new acetyl co-A carboxylase inhibiting herbicide labeled for use in bermudagrass, St. Augustinegrass [Stenotaphrum secundatum (Walter) Kuntze], and zoysiagrass (Zoysia spp.) turf. Field research was conducted in 2018 to evaluate the efficacy and turfgrass safety of pinoxaden applications for postemergence (POST) control of crabgrass at various stages of growth. Research was conducted at the East Tennessee AgResearch & Education Center (Knoxville, TN) on a stand of common bermudagrass (Cynodon dactylon L., cv. 'Yukon') naturally infested with smooth crabgrass (Digitaria ischaemum). Research was also conducted at the Athens Turfgrass Research & Education Center (Athens, GA) on a stand of hybrid bermudagrass (C. dactylon x C. transvaalensis Burtt-Davey, cv. 'TifTuf') naturally infested with large crabgrass (Digitaria sanguinalis). Mowing height in Tennessee measured 1.5 cm compared to 5 cm in Georgia. Plots at both locations measured 1.5 x 3.0 m and were arranged in randomized complete block designs with four replications. Pinoxaden was applied both singularly and sequentially at 153 g ha-1 when crabgrass averaged 2 to 3 tillers or 5 to 7 tillers. Single and sequential applications of pinoxaden at 312 g ha-1 were applied at the 5 to 7 tiller stage as well. All pinoxaden treatments included a methylated rapeseed oil adjuvant at 0.5% v/v. Sequential treatments were applied on a 14-day interval at both timings. Pinoxaden treatments were compared to sequential applications of quinclorac (880 g ha-1) + methylated seed oil (0.5% v/v) at the 5 to 7 tiller stage. In Tennessee, smooth crabgrass control and bermudagrass injury were visually assessed using a 0 (i.e., lowest) to 100% (i.e., highest) scale 3 to 16 weeks after initial treatment (WAIT) compared to non-treated control plots in each replication. Crabgrass cover in all plots was assessed on each date that plots were assessed visually. In Georgia, large crabgrass cover was visually assessed at each rating timing and converted to percent control by comparing back to initial cover ratings for each plot at time of treatment application. All data were subjected to analysis of variance in R (v. 3.5.1) with means separated using the 'LSD.test' function of the 'agricolae' package. At the conclusion of the Tennessee study, smooth crabgrass was controlled >90% with sequential pinoxaden applications, regardless of application rate or timing. Control was similar to quinclorac applied at the 5 to 7 tiller stage. Although single applications of pinoxaden were highly active on smooth crabgrass at both rates and timings (96 to 100% control 6 WAIT), overall control with these treatments only ranged from 48 to 74% by the end of the study. No common bermudagrass injury was observed in response to any pinoxaden applications in Tennessee. In Georgia, sequential applications of pinoxaden controlled large crabgrass >85% by the end of the study, regardless of application rate or timing. Single applications of pinoxaden failed to control large crabgrass >60%. Transient hybrid bermudagrass injury (‚ȧ 25%) was detected with both single and sequential applications of pinoxaden; however, all turfgrass recovered by the end of the study. This research demonstrates that sequential applications of pinoxaden can effectively control crabgrass POST in bermudagrass. However, additional research is warranted to explore differences in control among crabgrass species, as well as differences in tolerance among warm-season turfgrass species and cultivars."
Language:English
References:0
Note:This item is an abstract only!
"181"
"Poster #1634"
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Henry, G. M., K. Tucker, J. T. Brosnan, and G. K. Breeden. 2019. Postemergence crabgrass (Digitaria spp.) control in bermudagrass (Cynodon spp.) with pinoxaden. Agron. Abr. p. 118569.
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