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Response of Bermudagrass (Cynodon dactylon) Turf to Winter-Applied Herbicides

  • B. J. Johnson (a1)

Abstract

Paraquat (1,1′-dimethyl-4,4′-bipyridinium ion), 2,4-D [2,4-dichlorophenoxy)acetic acid], dicamba (3,6-dichloro-o-anisic acid), and 2,4-D plus dicamba were applied as postemergence herbicide treatments in two experiments to weed-free dormant bermudagrass [Cynodon dactylon (L.) ♯3 CYNDA] turf in the Piedmont region of Georgia. Herbicides were applied as a split application to separate plots on February 2 plus February 16 and February 16 plus March 3 (± 4 days) on four bermudagrass cultivars (‘Tifway’, ‘Tifgreen’, ‘Tifdwarf’, and ‘Ormond’) in one experiment and to Tifway with vertical mowing treatments for thatch removal in a second experiment. In 2 of 3 years, paraquat applied to dormant turf in February delayed growth of bermudagrass in April. The growth of Tifway and Tifdwarf was retarded more from paraquat at 1.2 kg ai/ha in one year than Tifgreen or Ormond. Dicamba applied alone or with 2,4-D delayed turf growth in early spring more than did 2,4-D alone. In thatch-free turf, selected treatments of paraquat, dicamba, and 2,4-D plus dicamba also delayed spring growth of bermudagrass more than did 2,4-D.

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References

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1. Breuninger, J. M. and Schmidt, R. E. 1981. Post-dormancy growth of bermudagrass as influenced by low temperatures and selected preemergence herbicides. Agron. J. 73:945949.
2. Fullerton, T. M., Davis, A. M., and Frans, R. E. 1967. The effect of selected preemergence herbicides and fertilizer levels on the establishment of several turfgrasses. Proc. South. Weed Conf. 20:6974.
3. Hurto, K. A. and Turgeon, A. J. 1979. Influence of thatch on preemergence herbicide activity in Kentucky bluegrass (Poa pratensis turf. Weed Sci. 27:141146.
4. Johnson, B. J. 1976. Glyphosate for weed control in dormant bermudagrass. Weed Sci. 24:140143.
5. Johnson, B. J. 1977. Winter annual weed control in dormant bermudagrass turf. Weed Sci. 25:145150.
6. Johnson, B. J. and Ware, G. D. 1978. Dates of glyphosate treatments on weeds and bermudagrass (Cynodon dactylon). Weed Sci. 26:523526.
7. Johnson, B. J. 1980. Postemergence winter weed control in bermudagrass (Cynodon dactylon) turf. Weed Sci. 28:385392.
8. Murray, J. J. 1980. Effects of herbicides on cold temperature tolerance of bermudagrass. Proc. Northeast. Weed Sci. Soc. 34:372377.

Keywords

Response of Bermudagrass (Cynodon dactylon) Turf to Winter-Applied Herbicides

  • B. J. Johnson (a1)

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