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This article in JEQ

  1. Vol. 6 No. 3, p. 263-267
    Received: Aug 17, 1976

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Creeping Bentgrass Response to Aquatic Herbicides in Irrigation Water1

  1. R. C. Hiltibran and
  2. A. J. Turgeon2



Turfgrass sites are frequently irrigated with water from nearby ponds. However, aquatic herbicides used to control aquatic plants and algae may be phytotoxic to turfgrasses. The purpose of this study was to determine the potential for turfgrass injury following irrigation from herbicide-treated ponds.

Injury to creeping bentgrass (Agrostis palustris Huds. ‘Penncross’) irrigated with water containing aquatic herbicides depended upon the herbicide, the concentration, formulation, season, and frequency of application. The most injurious herbicide was dichlobenil (2 6-dichlorobenzonitrile). Diquat [6 7-dihydrodipyrido(1,2-a:2′,1′-c)-pyrazinediium ion]; silvex [2-(2,4,5-trichlorophenoxy) propionic acid]; simazine [2-chloro-4,6-bis(ethylamino)-s-triazine]; and the ester formulation of 2,4-D [(2,4-dichlorophenoxy)acetic acid] caused moderate injury to the turf. No injury was observed from copper sulfate; copper-triethanolamine; diuron [3-(3,4-dichlorophenyl)-1,1-dimethylurea]; endothall [7-oxabicyclo(2.2.1) heptane-2,3-dicarboxylic acid]; or fenac [2,3,6-trichlorophenyl) acetic acid]. In actual practice, simazine is the only herbicide which would be expected to cause unacceptable turfgrass injury because of its persistance in water and its possible accumulation in irrigated turf.

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