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The aquatic fate of triclopyr in whole‐pond treatments
Author(s) -
Petty David G,
Skogerboe John G,
Getsinger Kurt D,
Foster Dale R,
Houtman Bruce A,
Fairchild James F,
Anderson Lars W
Publication year - 2001
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.343
Subject(s) - triclopyr , sediment , water quality , zoology , water column , environmental science , chemistry , environmental chemistry , biology , ecology , weed control , paleontology
The aquatic fate of the triethylamine salt formulation of triclopyr (3,5,6‐trichloro‐2‐pyridinyloxyacetic acid) was determined in whole‐pond applications in closed (no water exchange) systems in California, Missouri and Texas in two studies conducted in 1995 and 1996. These studies determined dissipation rates of triclopyr and its principal metabolites, 3,5,6‐trichloropyridinol (TCP) and 3,5,6‐trichloro‐2‐methoxypyridine (TMP) in water, sediment and finfish. Ponds at each site containing a healthy biological community were treated at 2.5 mg AE litre −1 triclopyr. Water and sediment samples were collected through 12 weeks post‐treatment, and non‐target animals were collected through 4 weeks post‐treatment. Dissipation rates for triclopyr, TCP and TMP were similar at each of the study sites, despite differences in weather, water quality, biotic community, light transmission and geographic location. Half‐lives of triclopyr in water ranged from 5.9 to 7.5 days, while those of TCP and TMP ranged from 4 to 8.8 and 4 to 10 days, respectively. Levels of triclopyr and TCP declined in sediments at half‐lives ranging from 2.8 to 4.6 days and 3.8 to 13.3 days, respectively. No TMP was detected in sediment. Triclopyr and TCP cleared from fish in relation to concentrations found in the water column. TMP levels in fish were generally an order of magnitude higher than levels of triclopyr and TCP, particularly in the visceral portion of the animals. No adverse effects on water quality or on the non‐target biotic community were found following triclopyr applications. Results of these studies were comparable to those of triclopyr dissipation studies conducted in reservoirs, lakes and riverine systems in Georgia, Florida, Minnesota and Washington, indicating that the degradation and dissipation of triclopyr and its metabolites are similar in representative systems throughout the USA. © 2001 Society of Chemical Industry