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Variations in Toxicity to Bluegill Sunfish of Phenoxy Herbicides

  • Janice S. Hughes (a1) and James T. Davis (a1)


The toxicity to bluegill sunfish (Lepomis macrochirus, Rafinesque) of 3 to 21 commercial formulations of 2,4-dichlorophenoxyacetic acid (2,4-D), 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), 2-(2,4-dichlorophenoxy)propionic acid [2-(2,4-DP)], and 2-(2,4,5-trichlorophenoxy)propionic acid (silvex) was determined. The variations among formulations of the same herbicide were much greater than those among different herbicides. Variations in toxicity of a single formulation were also noted. Formulations of each herbicide were reported as either safe or unsafe for aquatic applications. Amine salts were generally less toxic to fish than esters. The formulation selected for use should be assayed prior to field application, using the receiving water.



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Variations in Toxicity to Bluegill Sunfish of Phenoxy Herbicides

  • Janice S. Hughes (a1) and James T. Davis (a1)


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