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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1993_vol47.pdf#page=134
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Neal, J. C. |
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| Author Affiliation: | Associate Professor, Department of Floriculture and Ornamental Horticulture, Cornell University, Ithaca, NY |
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| Title: | Safety of herbicides on overseeded and newly seeded turfgrass |
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| Section: | Turfgrass and plant growth regulators workshop - Thursday January 7
Other records with the "Turfgrass and plant growth regulators workshop - Thursday January 7" Section
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| Meeting Info.: | Baltimore, MD: January 4-7, 1993 |
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| Source: | Proceedings of the 47th Annual Meeting of the Northeastern Weed Science Society. Vol. 47, 1993, p. 134. |
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| Publishing Information: | Ithaca, NY: Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Herbicides; Herbicide injury; Overseeding; Seeding; Seedlings; Weed control; Graminicide; Pesticide residues; Establishment; Postemergence herbicides; Preemergence herbicides
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| Abstract/Contents: | "Limited options are available for weed control in newly seeded turf. Historically dicot weeds have been controlled with bromoxynil; however, recent label restrictions preclude its use on most turf areas. Fortunately, once seedling turf has been mowed three or four times, other dicot herbicides may be safely used. As a result, dicot weeds are generally not a great problem in new seedings. In contrast, most graminicides have a narrow margin of safety on young turf; therefore, annual grasses remain the most persistent and difficult to manage weeds infesting new seedings. The only preemergent graminicide with no pre-seeding or post-seeding restrictions is siduron. All other preemergent herbicides have specific treatment-to-seeding and seeding-to-treatment intervals which must be observed. These intervals differ by product, rate, formulation, and turfgrass species. Recent research has also shown regional and yearly variability in the longevity of soil residues from these herbicides. Under warm, moist year, residues dissipate more rapidly than in a dry year. When dry weather persists through the growing season the only reliable method for predicting whether soil residues may interfere with seedling establishment is to conduct a bioassay. The seeding-to-treatment intervals seem to be more predictable but still vary by product, rate, and the rate of turf establishment. Similar seeding-to-treatment and treatment-to-seeding intervals guide the use of postemergent graminicides. As most of our postemergent herbicides have relatively short soil residuals, the latter interval is usually easily difined. However, the seeding-to-treatment interval is affected by turf species, herbicide, rate, additives, and environmental conditions (which affect the rate of turf establishment). Where herbicide injury is likely to occur, another consideration is: what will decrease turf quality more - the weed or the herbicide. This decision is a site-specific issue and will depend on the type of turf, its use (sod production, home lawn, etc.), and the tolerance of the turf manager and owner (or greens committee) to weeds and turf injury. One topic deserving more attention and discussion is a definition of "established turf", as this term is used to describe the developmental stage when herbicides may safely be used. To [Too] often the safe intervals are described in calendar days or months, when a more appropriate measure would be a developmental stage when turf will tolerate the herbicide application. Recently, one postemergent graminicide has characterized the appropriate interval based on the number of tillers present. Other methods employed have included the number of mowings, the point at which stolons develop, and % ground cover. The most appropriate method will depend on the herbicide and turf species. More clearly defined and consistent terminology would help turf managers and those who provide weed control recommendations to avoid turf injury resulting from inappropriate herbicide usage." |
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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):
Neal, J. C. 1993. Safety of herbicides on overseeded and newly seeded turfgrass. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 47:p. 134. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1993_vol47.pdf#page=134
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 v. 53 |
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