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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1984_vol38.pdf#page=302
Last checked: 07/29/2013
Requires: PDF Reader
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.;
Nash, A. S. |
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| Title: | Effects of MON 4621 and MON 4623 on Kentucky bluegrass and tall fescue turf |
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| Source: | Proceedings of the Annual Meeting of the Northeastern Weed Science Society. Vol. 38, 1984, p. 307-308. |
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| Publishing Information: | Ithaca, N. Y. : Northeastern Weed Science Society |
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| Keywords: | TIC Keywords: Clipping weight; Flurprimidol
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| Abstract/Contents: | Studies were initiated to evaluate the effects of plant growth retardants (PGR's: MON 4621, MON 4623, flurprimidol and mefluidide) on growth, seedhead suppression, and injury to tall fescue (Festuca arundinacea Schreb.) and Kentucky bluegrass (Poa pratensis L.) turf. Tall fescue plot size was 1.5 by 7.6 meters and Kentucky bluegrass plot size was 1.5 by 1.5 meters. Plots were arranged in a randomized complete block design with three replicates for all studies. In April 1983, MON 4623 was applied by hand with a shaker bottle, whereas all other materials were applied as sprays. Chemicals and rates of application are listed in Table 1. Growth response was determined by canopy height measurements and clipping weights. Tall fescue clippings (7 cm) were obtained from unmowed portions of plots, thus clipping weights were cumulative from the time of PGR application. Kentucky bluegrass clippings (5 cm) were obtained from the same swath on a weekly basis. Seedhead suppression of Kentucky bluegrass was evaluated by seedhead counts and measurements of seedhead height. Injury was rated visually on a scale of 0 to 100, where 0 represents no injury and 100 represents complete necrosis. All PGR's reduced canopy height and clipping weights of tall fescue and Kentucky bluegrass turf. Height and clipping weight suppression by flurprimidol was delayed, but the duration of suppression was longer than other PGR's. In general, high and low rates of MON 4621 and MON 4623 resulted in the same degree of canopy height suppression. A similar trend also occurred in dry weight data. All PGR treatments elicited an unacceptable level of turfgrass injury for a home lawn. Mefluidide generally caused the most injury to Kentucky bluegrass. More injury was evident in Kentucky bluegrass turf with time, whereas, visual injury to tall fescue decreased in time. On May 12, tall fescue treated with mefluidide, MON 4621 (2.8 kg/ha) and MON 4623 (5.6 kg/ha) exhibited acceptable quality, but there were no significant differences among tall fescue treatments. All Kentucky bluegrass treatments continued to exhibit unacceptable quality on May 12. Data indicated that mefluidide suppressed Kentucky bluegrass seedhead density and seedhead height more than other PGR's. Although the data shows a trend toward a reduction of seedhead density as a result of MON 4621 and MON 4623 applications in comparison to the check, these differences were not significant. Seedhead height was significantly reduced with MON 4621 but not with MON 4623. |
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| Language: | English |
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| References: | Unknown |
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| Note: | Tables
This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Welterlen, M. S., and A. S. Nash. 1984. Effects of MON 4621 and MON 4623 on Kentucky bluegrass and tall fescue turf. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 38:p. 307-308. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1984_vol38.pdf#page=302
Last checked: 07/29/2013
Requires: PDF Reader
Notes: Item is within a single large file |
| 
MSU catalog number: SB 610 .N62 |
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Digitally in TIC by file name: newss1984 |
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