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  1. Vol. 16 No. 4, p. 598-599
     
    Received: Dec 31, 1975
    Published: July, 1976


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doi:10.2135/cropsci1976.0011183X001600040045x

Timing of Glyphosate for Conversion of Bermudagrass Turf to Tall Fescue1

  1. B. J. Johnson

Abstract

Abstract

Renovation of bermudagrass [Cynodon dactylon (L.) Pers.] turf to tall rescue [Festuca arundinacea Schreb. ‘Kentucky 31’] is a major problem since soil fumigation is usually necessary to completely kill the existing turf. This study was conducted to determine if bermudagrass could be controlled with a fall application of glyphosate [N-(phosphonomethyl) glycine] and the turf successfully reestablished by over-seeding with tall rescue without disturbing the soil surface. Herbicidal treatments were applied 0, 1, 5, or 10 days before overseeding, and 1, 5, or 7 days after overseeding.

Bermudagrass ground cover was reduced most after 1 year where glyphosate was applied any time before overseeding in fall 1973 (1 to 4% ground cover), and l0 days before overseeding in fall 1974 (6% ground cover). After the second growing season, bermudagrass ground cover ranged from 9 to 18% cover. Glyphosate treatments did not injure tall rescue either year when applied 1, 5, or 10 days before overseeding. Glyphosate applied as a single treatment significantly reduced bermudagrass ground cover, but did not give complete control.

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