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Interference and Control of Large Crabgrass (Digitaria sanguinalis) and Southern Sandbur (Cenchrus echinatus) in Forage Bermudagrass (Cynodon dactylon)

Published online by Cambridge University Press:  12 June 2017

Robert H. Walker ,
Glenn Wehtje  and
John S. Richburg III
Robert H. Walker
Affiliation:
Department of Agronomy and Soils and Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849-5412
Glenn Wehtje
Affiliation:
Department of Agronomy and Soils and Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849-5412
John S. Richburg III
Affiliation:
Department of Agronomy and Soils and Alabama Agricultural Experiment Station, Auburn University, Auburn, AL 36849-5412
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Abstract

Field experiments were conducted at two locations in central Alabama to evaluate competitiveness of large crabgrass and southern sandbur with ‘Tifton 78’ hybrid bermudagrass as influenced by diuron application and sprigging rate. Large crabgrass was the more competitive species. In late season, bermudagrass ground cover with no weed competition was 96% compared with 72 and 81% where large crabgrass and southern sandbur, respectively, were present. Similarly, large crabgrass and southern sandbur reduced the proportion of bermudagrass in the cumulative harvested forage by at least 59 and 38%, respectively. Application of diuron preemergence (PRE) at 1.1 kg ai/ha was more effective than postemergence (POST) application, both in terms of weed control and bermudagrass safety. With diuron applied PRE, large crabgrass and southern sandbur reduced the proportion of bermudagrass in the harvested forage only 32 and 25%, respectively. Increasing bermudagrass sprigging rate was beneficial for weed control but of relatively minor importance compared with diuron PRE.

Keywords

Diuron, N'-(3,4-dichlorophenyl)-N,N-dimethylurealarge crabgrass, Digitaria sanguinalis (L.) Scop. # DIGSAsouthern sandbur, Cenchrus echinatus L. # CCHECbermudagrass, Cynodon dactylon (L). Pers. ‘Tifton 78’ # CYNDAWeed–crop competitionbermudagrass sprigging ratediuron application methodsCCHECCYNDADIGSADAP, days after plantingPRE, preemergence (to weeds and prior to bermudagrass regrowth)POST, postemergence (to both weeds and bermudagrass)
Type
Research
Information
Weed Technology , Volume 12 , Issue 4 , December 1998 , pp. 707 - 711
Copyright
Copyright © 1998 by the Weed Science Society of America 

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