Concerns over the adverse effects of pesticides on human health and the environment have led to the development of stricter pesticide regulations and the outright banning of many pesticides in the U.S. Bifenthrin and fipronil are important pesticides used in the nursery industry for the control of imported fire ants (Solenopsis invicta Buren, S. richteri Forel, and their hybrids) to meet the requirements of the Imported Fire Ant Quarantine. Nurseries typically use highly-organic media ("soilless" media) and little is known about the fate of these pesticides when used with these media.
Our research measured the influence of irrigation frequency and time on the degradation of bifenthrin and fipronil in a nursery medium composed of 90% pine bark and 10% mason sand. Media samples and media leachate samples were collected over a period of 180 days. Levels of bifenthrin, fipronil, and fipronil metabolites (MB45950, MB46136, MB46513) were measured using gas chromatography with electron capture detection (GC/ECD) and gas chromatography secondary ion mass spectrometry (GCMS/SIMS).
Bifenthrin levels in the nursery potting media initially dropped and then remained constant throughout the study. Fipronil levels in nursery potting media decreased over time. Levels of the fipronil metabolite MB45950 in potting media fluctuated over time, while the levels of this metabolite increased over time in media
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-07072004-142401 |
| Date | 07 July 2004 |
| Creators | Harris, III, Russell Stanley |
| Contributors | Paul W. Wilson, Edward W. Bush, Allen Owings, David Himlerick |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-07072004-142401/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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