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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1988_vol42.pdf#page=142
Last checked: 07/25/2013
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Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Welterlen, M. S. |
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| Author Affiliation: | Department of Agronomy, University of Maryland |
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| Title: | Application Timing of Imazethapyr and Imazapyr on Tall Fescue Turf. |
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| Source: | Proceedings of the 42nd Annual Meeting of the Northeastern Weed Science Society. Vol. 42, 1988, p. 142. |
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| Publishing Information: | Ithaca, N. Y. : Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Festuca arundinacea; Mefluidide; Imazethapyr; Imazapyr; Growth regulators
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| Abstract/Contents: | "Timing of spring application of plant growth regulators (PGRs) is important not only in terms of efficacy of growth suppression but also in terms of logistics of application by turf managers. Those treating large turf acreages in various locations are faced with logistical problems in scheduling PGR applications if the critical period of treatment is short. Consequently, new PGRs must be evaluated for the duration of the critical period of application which illicits efficacious suppression of turf height and turfgrass seedheads. The objective of this study was to evaluate effects of spring application timing (50, 74 and 100% turf greenup) and respective rates (74 + 2.7, and 99 + 3.7 and 123 + 4.4 g ai ha-1) of imazathpyr plus imazapyr combinations (ACP 1911) and mefluidide (426 g ai ha-1) on a mature 'Kentucky 31' tall fescue (Festuca arundinacea Schreb.) turf. This study was conducted at Beltsville, Maryland in a Mattapex silt-loam soil (fine silty, mixed mesic Aqualific Normudults) with a pH of 6.2 and 2.1% organic matter. Prior to PGR application, turf was maintained at 5.7 cm with rotary mower. PGRs were applied with CO2 pressurized sprayer at a dilution rate of 467.5 1 ha-1 with surfactant (X-77, 0.25% v/v) added to all PGR treatments. Plots were arranged in a randomized complete block design with three replicates. Data was analyzed by analysis of variance. Early application of the high rate of ACP 1911 at 50% turf greenup resulted in unacceptable visual turf quality and color, which lasted for at least 5 weeks. Quality and color of turf treated with the two lower rates was similar to turf response from mefluidide treatment. Turf height suppression was evident in all treated turf and termination of suppression occurred between 4 and 6 weeks after application. Duration of seedhead suppression was evident in turf treated with the two higher rates of ACP 1911 and mefluidide; however, the lower rate of ACP 1911 did not provide acceptable seedhead suppression. Application of ACP 1911 at 75% greenup resulted in a reduction of turf qualtiy for at least 5 weeks. Quality improved with the lower rate of ACP 1911; however, turf treated with the high rate of ACP 1911 did not exhibit qualtiy improvement. Turf discoloration was evident for at least 4 weeks and recovery occurred by 6 weeks after application, even with the high rate of ACP 1911. Height suppression lasted at least 5 weeks and seedhead suppression was evident in all PGR treated turf. Turf treated with ACP 1911 and mefluidide at 100% greenup remained at acceptable levels throughout the growth suppression period which lasted approximately 6 weeks for all treatments. More discoloration was observed in turf treated with the teo higher rates of ACP 1911. Turf treated with the medium rate of ACP 1911 recovered from discoloration; however, turf treated with the high rate of ACP 1911 had not recovered by 6 weeks after treatment. Seedhead suppression was acceptable for all treatments. In conclusion the optimum rate and timing of ACP 1911 application was the medium rate at 100% greenup. This rate also provided adequate growth suppression and seedhead control if applied earlier than 100 % greenup. In addition, turf treated with the medium rate of ACP 1911 recoverd from discoloration and quality reductions which were evident with earlier applications." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Welterlen, M. S. 1988. Application Timing of Imazethapyr and Imazapyr on Tall Fescue Turf.. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 42:p. 142. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1988_vol42.pdf#page=142
Last checked: 07/25/2013
Requires: PDF Reader
Notes: Item is within a single large file |
| 
MSU catalog number: SB 610 .N62 |
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