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This article in AJ

  1. Vol. 84 No. 5, p. 786-788
     
    Received: Mar 20, 1991


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doi:10.2134/agronj1992.00021962008400050005x

Crabgrass Control In Coastal Bermudagrass

  1. A. E. Smith  and
  2. L. D. Martin
  1. U niv. of Georgia Col. of Agric. Exp. Stns., Georgia Stn., Griffin, GA 30223-1797
    M uresk Institute of Agriculture, Curtin University, Western Australia

Abstract

Abstract

Many hectares of ‘Coastal’ bennudagrass [Cynodon dactylon (L.) Pers.] stands are lost during the second growing season after planting because of competition from large crabgrass [Digitaria sanquinalis (L.) Scop]. Experiments were conducted in southern Georgia on a Cecil (thermic, Typic Hapludults) sandy clay loam and central Georgia on a Greenville (clayey, thermic, Rhodic Kandiudults) sandy loam soil to evaluate chemical treatments for managing large crabgrass in Coastal bermudagrass. Herbicide treatments were applied to Coastal bermudagrass stands during the second growing season after planting to evaluate crabgrass control and to fully established stands to determine treatment damage to the Coastal bermudagrass. Norflurazon {4-chloro- 5 - (methylamino)-2-[3 - (trifluoromethyl)phenyl] -3(2H)-pyridazinone} applied during March at rates of 1.12 and 2.24 kg ai ha−1 resulted in >80% control of large crabgrass up to 90 and 50 d after treatment, respectively. Treatments with norflurazon at rates as high as 2.24 kg −1 did not damage the Coastal bennudagrass stand or decrease yield compared to the untreated control. These data indicate that norflurazon would be an excellent candidate herbicide for use in the control of large crabgrass in Coastal bermudagrass pastures and hayfields.

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