SYMPOSIA PAPER Published: 01 January 1979
STP35988S

Dietary Toxicity Tests with Mallards, Simulating Residue Decline of Chlorpyrifos and Avoidance of Treated Food

Source

Dietary 11-day toxicant feeding tests were used to determine the effects of chlorpyrifos on repellency, lethality, food intake, and growth responses by mallards. Avoidance of food was noted at all concentrations tested (56 to 1124 ppm) with consequential decreases in weight growth. When an option between treated and untreated food was available, very little chlorpyrifos was consumed. Tests with dietary concentrations of chlorpyrifos simulating approximately the daily five-day half-life residue rate of decline on foliage treated with chlorpyrifos were compared with tests run under standard conditions where dietary concentrations were held constant throughout the 11-day toxicant feeding period. Initial concentrations resulting in LC50's for these tests were 644 and 357 ppm, respectively. These comparisons indicate that results from standard LC50 tests have a considerable added safety factor for compounds with a short residue half-life.

Author Information

Kenaga, EE
The Dow Chemical Company, Midland, Mich
Fink, RJ
Wildlife International, Ltd., Easton, Md
Beavers, JB
Wildlife International, Ltd., Easton, Md
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: E35
Pages: 36–44
DOI: 10.1520/STP35988S
ISBN-EB: 978-0-8031-4758-4
ISBN-13: 978-0-8031-0287-3