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1 July 1994 EFFECTS OF LETHAL AND SUBLETHAL CONCENTRATIONS OF THE HERBICIDE, TRICLOPYR BUTOXYETHYL ESTER, IN THE DIET OF ZEBRA FINCHES
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Abstract

Lethal and sublethal effects of dietary triclopyr butoxyethyl ester (TBEE) on zebra finches (Poephila guttata Gould) were determined in laboratory experiments conducted between 8 January and 1 May 1991. The 8-day median lethal dietary concentration, LC50 (95% confidence interval), of TBEE to zebra finches was 1,923 (1,627 to 2,277) mg/kg. In the sublethal effects experiment, when birds were exposed to 500 mg/kg TBEE in the diet for 29 days, food consumption and body weight were significantly depressed (P < 0.05). Similar prolonged exposures to 50 and 150 mg/kg TBEE in the diet had no significant effect on food consumption or body weight (P > 0.05). Perch-hopping activity was depressed relative to controls in the 500 mg/kg group, and elevated in the 150 mg/kg group, but neither of these differences was significant (P > 0.05). Disappearance of TBEE residues from treated seeds over the 29 day experimental period followed an exponential decay model, with half-lives in the order of 15 to 18 days. On the basis of our observation that TBEE had no significant adverse effects at a concentration greater than the maximum expected environmental concentration, we propose that forestry applications of triclopyr at registered dosage rates pose little risk to wild songbirds.

Holmes, Thompson, Wainio-Keizer, Capell, and Staznik: EFFECTS OF LETHAL AND SUBLETHAL CONCENTRATIONS OF THE HERBICIDE, TRICLOPYR BUTOXYETHYL ESTER, IN THE DIET OF ZEBRA FINCHES
Stephen B. Holmes, Dean G. Thompson, Kerrie L. Wainio-Keizer, Scott S. Capell, and Bozena Staznik "EFFECTS OF LETHAL AND SUBLETHAL CONCENTRATIONS OF THE HERBICIDE, TRICLOPYR BUTOXYETHYL ESTER, IN THE DIET OF ZEBRA FINCHES," Journal of Wildlife Diseases 30(3), 319-327, (1 July 1994). https://doi.org/10.7589/0090-3558-30.3.319
Received: 10 May 1993; Published: 1 July 1994
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