Full TGIF Record # 16002
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Publication Type:
i
Report
Content Type:Abstract or Summary only
Author(s):Murphy, T. R.
Author Affiliation:Extension Agronomy Department, University of Georgia, Griffin, GA.
Title:Warm-Season Turfgrass Tolerance To Postemergence Herbicides.
Meeting Info.:Held: January 18-20, 1988, Tulsa, OK.
Source:Southern Weed Science Society Proceedings. Vol. 41, January 1988, p. 121.
Publishing Information:Nashville, TN: Southern Weed Science Society.
Keywords:TIC Keywords: Warm season turfgrasses; Resistance; Postemergence herbicides; Cynodon dactylon; Eremochloa ophiuroides; Weeds; Spring Green-up; Quality
Abstract/Contents:"Winter annual weeds are a major problem in dormant warm-season turfgrasses. This group of weeds can be effectively controlled with fall and winter applications of certain herbicides. Due to environmental and/or management factors, herbicides are often not applied until the spring months. The tolerance of warm-season turfgrasses during spring green-up (emergence from winter dormancy) to postemergence herbicides has not been well documented. Studies were conducted at the Georgia Station to determine the tolerance of 'Tifway' bermudagrass [Cynodon transvaalensis Burtt-Davy] X [Cynodon dactylon (L.) Pers.] and centipedegrass [Eremochloa ophiuroides (Munro) Hack.] during spring green-up to single applications of postemergence herbicides. Herbicides were applied to established centipedegrass at the 0, 50 and 100% green-up growth stage. 'Tifway' bermudagrass was treated at 0, 33, 66 and 99% green-up in an additional experiment. Turfgrass quality ratings were recorded at various intervals after herbicide application. At all stages of green-up, centipedegrass quality was not reduced by dicamba (0.6 kg/ha), 2,4-D (0.8 kg/ha), 2,4-D + MCPP + dicamba (0.8 + 0.4 + 0.09 kg/ha), MCPP + 2,4-D + dicamba (0.6 + 0.2 + 0.08 kg/ha) or atrazine (2.2 kg/ha). Applied at the dormant growth stage, sulfometuron (52 g/ha) and DPX-M6316 (70 g/ha) + X-77 (0.25% v/v) slightly reduced (<=6%) centipedegrass quality at 12 weeks after application; however, these herbicides did not reduce centipedegrass quality when applied at 50 and 100% green-up. When applied to dormant 'Tifway' bermudagrass, sulfometuron (52 g/ha) severely decreased turf quality for nine weeks after treatment. Metsulfuron (52 g/ha) + X-77 (0.25% v/v), applied at the dormant growth stage, did not reduce bermudagrass quality. Imazaquin (0.41 kg/ha) + X-77 (0.25% v/v) and 2,4-D + MCPP + dicamba (1.12 + 0.6 + 0.11 kg/ha) applied at the same growth stage decreased bermudagrass quality for seven and five weeks, respectively, after treatment. When applications were made at 50% green-up, sulfometuron and imazaquin + X-77 reduced turfgrass quality at 4 and 5 weeks after treatment. At this growth stage, metsulfuron + X-77 and 2,4-D + MCPP + dicamba reduced quality only at 4 weeks after treatment. Herbicides injured bermudagrass less with applications at the 100% green-up growth stage than at the 0 and 50% green-up growth stage. DPX-M6316 + X-77 did not decrease turfgrass quality at any growth stage. 'Tifway' bermudagrass that was dormant (0% green-up) or in the 33% green-up stage had excellent tolerance to metribuzin (0.6 kg/ha), atrazine (2.2 kg/ha), simazine (2.2 kg/ha) and 2,4-D + MCPP + dicamba (0.8 + 0.4 + 0.09 kg/ha). Atrazine decreased quality for four and three weeks when applied at the 66 and 99% green-up growth stage, respectively. Mertibuzin reduced quality only one week when applied at 66 or 99% green-up. Simazine and 2,4-D + MCPP + dicamba did not affect quality when applied at the 99% green-up growth stage."
Language:English
References:0
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Murphy, T. R. 1988. Warm-Season Turfgrass Tolerance To Postemergence Herbicides.. South. Weed Sci. Soc. Proc. 41:p. 121.
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