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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1984_vol38.pdf#page=300
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, John A. |
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| Title: | Suppression of Poa annua L. seedheads in turfgrass areas |
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| Source: | Proceedings of the Annual Meeting of the Northeastern Weed Science Society. Vol. 38, 1984, p. 305-306. |
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| Publishing Information: | Ithaca, N. Y. : Northeastern Weed Science Society |
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| Keywords: | TIC Keywords: Poa annua; Growth regulators; Seedhead inhibition; Suppression
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| Abstract/Contents: | Poa annua L. (annual bluegrass), a very prevalent grass species in turfgrass areas, is often considered undesirable. One objection is the unsightly, whitish color of its seedheads which develop profusely in the spring. This distracts from turf appearance and is accentuated when the mowed seedheads remain on the turf. Three tests were initiated in 1983 to evaluate rates and timing of plant growth regulators for the suppression of Poa annua seedheads. The test sites, chemicals, rates and application dates are shown in Table 1. Materials were applied as sprays to replicated plots using 50 gallons of water per acre. Visual estimates of Poa annua injury were recorded periodically on a scale of 0 to 10, with 10 being brown (2.0 considered objectionable). Suppression of seedheads was determined by visual estimates or counts. Although treatments were initiated as early as April 14 or 22, some seedheads were starting to emerge. Timing studies in the future should be started earlier. Seedheads were objectionable in appearance from the last week in April or first week in May until about the end of May, with peak flowering occurring during the second and third week in May. The data was inconclusive, but when the seedheads numbered above 150 per sq ft, especially when open and brown, they made the turf area look objectionable. Mowing on a 2 to 3 day schedule (.75 inch height in golf course fairway) did not reduce the seedheads to a level where they were not objectionable. The results in Table 1 indicate that treatments made April 14 and 22 were more effective in suppressing seedheads than those made April 27, 29, May 6, or 17. Even though later treatments may provide better suppression in late May or early June, when seedheads are not necessarily objectionable, they were ineffective during peak flowering. Mefluidide at the .063 lb rate did not satisfactorily suppress seedheads. At rates from .125 to .25 lbs, depending on site, mefluidide reduced seedheads to a level where they were not objectionable. MH at the 2 lb rate suppressed seedheads, however, results were not as consistent as those of mefluidide and MH appeared to act slower. Although used in only one of the three studies, MON-4621 at the 2 or 4 lb rate appeared promising for seedhead suppression. Mefluidide and MH showed the potential to injure Poa annua, but this could be less objectionable than that of having the seedheads. The negative seedhead suppression from May treatments in the lawn study was due to stunted seedheads below the mowing height. The use of crop oil with mefluidide increased the suppression of seedheads, however there was some increase in Poa annua injury. It was observed in late May that Poa annua plants were darker green in color where early treatments of mefluidide, MH or MON-4621 effectively suppressed seedheads. No differences in color or stand were observed during the summer. |
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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. 1984. Suppression of Poa annua L. seedheads in turfgrass areas. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 38:p. 305-306. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1984_vol38.pdf#page=300
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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