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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Savoy, B. R.;
Smith, K. L. |
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| Author Affiliation: | Sandoz Agro, Inc., Overton, TX |
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| Title: | Weed control in Coastal bermudagrass with norflurazon applied preemergence |
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| Meeting Info.: | Charlotte, NC: January 18-20, 1993 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 46, 1993, p. 108. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Cynodon dactylon; Norflurazon; Weed control; Preemergence herbicides; Digitaria sanguinalis; Eleusine indica
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| Abstract/Contents: | "Hybrid bermudagrass [Cynodon dactylon (L.) Pers.] is an important part of grazing and hay programs in the southeastern U.S.A. Postemergence herbicides are available to control broadleaf weeds in bermudagrass pastures, but no effective herbicides are available to control grassy weeds, such as large crabgrass [Digitaria sanguinalis (L.) Scop.] and goosegrass [Eleusine indica (L.) Gaertn]. Norflurazon (ZORIAL) is used extensively in cotton and soybean to control annual grasses, sedges, and some broadleaf weeds. Recent work has demonstrated that norflurazon preemergence (PRE) up 2 lb ai acre-1 in 'Coastal' bermudagrass provided > 80% large crabgrass control up to 90 days after treatment, without adversely affecting forage yield (1). The purpose of this research was to evaluate the effectiveness of norflurazon applied PRE on grassy weeds and small-seeded annuals in established and newly-established hybrid bermudagrass hay meadows. Field studies were conducted from 1988 to 1992 in hybrid bermudagrass pastures and hay meadows in Georgia, Texas, Oklahoma, Louisiana, Mississippi, Arkansas, and Florida, primarily in sandy-loam or loamy-sand soils. Norflurazon was applied PRE at 0.25, 0.50, 0.75, 1.00, 1.50, and 2.00 lb acre-1 in established and newly-established stands. Plots in all studies were visually evaluated for percent weed control and percent bermudagrass injury (bleaching). Norflurazon applied PRE at 0.50 lb acre-1 provided excellent (> 90%) control of crabgrass and goosegrass in hybrid bermudagrass hay meadows up to 150 days after treatment. Good crop safety (< 15% bleaching at 30 to 50 days after treatment) was observed up to 0.75 lb acre-1 in newly established stands and 1.50 lb acre-1 in established stands. Preliminary results showed that norflurazon provided 90% control of broadleaf signalgrass [Brachiaria platyphylla (Griseb.) Nash] and > 80% control of yellow nutsedge [Cyperus esculentus (L.)] at > or = 0.50 lb acre-1 between 50 to 100 days after treatment. Field sandbur [Cenchrus longispuns (Hack.) Fern.] was suppressed 60 to 70% in one study with norflurazon applied at 1.00 to 1.50 lb acre-1. Norflurazon applied PRE at > or = 0.25 lb acre-1 provided > 80% control of Amaranthus spp. and prostrate spurge [Euphorbia humistrata (Engelm. ex Gray)] up to 50 days after treatment, however additional efficacy data is required for these weeds." |
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| Language: | English |
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| References: | 1 |
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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):
Savoy, B. R., and K. L. Smith. 1993. Weed control in Coastal bermudagrass with norflurazon applied preemergence. South. Weed Sci. Soc. Proc. 46:p. 108. |
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MSU catalog number: SB 611 .S6 v.46 |
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