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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1996_vol50.pdf#page=163
Last checked: 07/24/2013
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): | Johnson, B. J. |
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| Author Affiliation: | Professor, Crop and Soil Sciences, University of Georgia, Georgia Station, Griffin, GA |
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| Title: | Weed control in bermudagrasses overseeded with cool-season grasses |
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| Meeting Info.: | Williamsburg, VA; January 2-5, 1996 |
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| Source: | Proceedings of the 50th Annual Meeting of the Northeastern Weed Science Society. Vol. 50, 1996, p. 163. |
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| Publishing Information: | College Park, MD: Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Cool season turfgrasses; Cynodon; Ethofumesate; Fenarimol; Herbicide efficacy; Herbicide evaluation; Overseeding; Poa annua control; Weed control
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| Trade Names: | Rubigan; Prograss |
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| Abstract/Contents: | "Annual bluegrass (Poa annua L.) is a common winter annual that grows abundantly in turfgrasses throughout the United States. It is especially a severe problem where bermudagrass (Cynodon spp.) golf greens are seeded over in the fall with cool-season grasses. Preemergence (PRE) and postemergence (POST) herbicides have controlled bluegrass effectively in non-overseeded bermudagrass. However, the selection of herbicides applied for annual bluegrass control in overseeded bermudagrass is limited. This occurs because most herbicides must be applied 60 to 90 days before overseeding to obtain good germination of the overseeded cool-season grasses. In contrast, herbicides applied at this time generally do not control annual bluegrass consistantly. Rubigan (fenarimol) can safely be applied 2 weeks prior to bermudagrass greens overseeded with perennial ryegrass (Lolium perenne L.), but must be applied 2 to 4 weeks before overseeding roughstalk bluegrass (Poa trivialis L.). However, Rubigan did not provide consistant full-season annual bluegrass control. The control by late Februrary from a total of 4.5 lb ai/A rate ranged from 63 to 99%. The lower control occurred in years that had normal winter temperatures that favored optimum annual bluegrass growth. The tolerance of roughstalk bluegrass from PRE herbicides applied in the spring for the summer weed control varied with herbicides. When applied in mid-March, the injury was the lowest with Team (trifluralin + benefin), pendimethalin, Barricade (prodiamine), and bensulide, and the highest with Surflan (oryzalin). The injury to roughstalk bluegrass was intermediate when treated with Ronstar (oxadiazon), XL (oryzalin + benefin), Dimension (dithiopyr), Regalstar (benefin + oxadiazon) and goosegrass crabgrass control (bensulide + oxadiazon). Prograss (ethofumesate) effectively controlled annual bluegrass (ā„80%) when applied to bermudagrass greens overseeded with perennial ryegrass. To maintain effective control, Prograss must be applied at 1.0 lb ai/A following overseeding in October and at the same rate one month later. Maximum injury to perennial ryegrass from October and November treatments were delayed until November and December. Xanthomonas campestris pv. poannua has potential as a biological control agent for annual bluegrass control in bermudagrass overseeded with perennial ryegrass. However, maximum annual bluegrass control by early April was approximatley 50% when isolate MB 245 was applied in three applications in January and Feburary. The control was improved slightly (65%) when the isolate was applied in seven applications from mid-September through mid-March." |
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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):
Johnson, B. J. 1996. Weed control in bermudagrasses overseeded with cool-season grasses. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 50:p. 163. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1996_vol50.pdf#page=163
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
| 
MSU catalog number: SB 610 .N62 v. 50 |
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