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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1982_vol36.pdf#page=334
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): | Jagschitz, J. A. |
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| Title: | Evaluation of growth retardants in cool season lawn turf |
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| Source: | Proceedings of the Annual Meeting of the Northeastern Weed Science Society. Vol. 36, 1982, p. 334-335. |
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| Publishing Information: | Ithaca, N. Y. : Northeastern Weed Science Society |
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| Keywords: | TIC Keywords: Mowing; Lolium perenne; Poa pratensis; Mefluidide
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| Abstract/Contents: | Three studies were initiated in 1981 to evaluate chemical growth retardants for the suppression of top growth and seedheads in lawn turf. Reduced growth could lessen mowing needs and consequently conserve energy and labor. One study was on perennial ryegrass (Lolium perenne L.) treated in May with retreatment in July. The other two studies were on Kentucky bluegrass (Poa pratensis L.) with applications made in May or July. Chemicals were applied as sprays (50 gpa) to replicated plots measuring 4.5 by 6 feet. The chemicals, rates and dates of application are shown in Table 1. In the May studies EL500 and PP333 were watered in before the other materials were applied while in July irrigation followed 24 hours after chemical application. Weekly mowings at a 2-inch height were resumed eight weeks following treatment. Growth response was determined by grass height measurements and seedhead counts. Mowing needs were determined by mowing the grass when it reached a height of 3.5 inches (75% growth above the normal 2-inch height). There also was a 4.5 inch mowing schedule on untreated turf. Visual estimates of grass injury were recorded periodically on a scale of 0 to 10 with 10 being brown or dead turf. The results in Table 1 indicate that MBR-18337, mefluidide, MH and MH plus CF suppressed the top growth of Kentucky bluegrass and perennial ryegrass with combinations of mefluidide plus EL500 or PP333 providing the greatest reductions. All treatments showed the potential for producing objectionable grass discoloration. Very severe injury of ryegrass developed from the repeat application in July of MH and MH plus CF. Seedhead suppression of bluegrass and ryegrass was good with mefluidide while MBR-18337 was more effective on bluegrass and MH and MH plus CF were more effective on ryegrass. The addition of 1/8 lb of mefluidide to EL500 or PP333 (both poor seedhead suppresants) provided good bluegrass seedhead suppression while combinations were less effective on ryegrass. Seedheads were less distracting in appearance in ryegrass turf than in bluegrass turf. In the bluegrass turf some treated seedheads were brown and stunted and served to detract from appearance. Assuming that lawns are mowed weekly, all retardant treatments reduced mowing needs by at least 75% during the initial 4-week period and by at least 50% during the 8-week period. Mowing needs were also lessened by not mowing untreated turf until it reached a specific height. Delaying mowing until grass reached a 3.5 and 4.5 inch height resulted in at least a 25% and 50% reduction in mowing needs, respectively. There was, however, some grass injury, especially with turf mowed at the 4.5 inch height, observed following the resumption of regular 2-inch mowing. |
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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):
Jagschitz, J. A. 1982. Evaluation of growth retardants in cool season lawn turf. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 36:p. 334-335. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1982_vol36.pdf#page=334
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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