Major transport mechanisms of pyrethroids in residential settings and effects of mitigation measures

Paul C. Davidson, Russell L. Jones, Christopher M. Harbourt, Paul Hendley, Gregory E. Goodwin, Bradley A. Sliz

Research output: Contribution to journalArticlepeer-review

Abstract

The major pathways for transport of pyrethroids were determined in runoff studies conducted at a full-scale test facility in central California, USA. The 6 replicate house lots were typical of front lawns and house fronts of California residential developments and consisted of stucco walls, garage doors, driveways, and residential lawn irrigation sprinkler systems. Each of the 6 lots also included a rainfall simulator to generate artificial rainfall events. Different pyrethroids were applied to 5 surfaces-driveway, garage door and adjacent walls, lawn, lawn perimeter (grass near the house walls), and house walls above grass. The volume of runoff water from each house lot was measured, sampled, and analyzed to determine the amount of pyrethroid mass lost from each surface. Applications to 3 of the house lots were made using the application practices typically used prior to recent label changes, and applications were made to the other 3 house lots according to the revised application procedures. Results from the house lots using the historic application procedures showed that losses of the compounds applied to the driveway and garage door (including the adjacent walls) were 99.75% of total measured runoff losses. The greatest losses were associated with significant rainfall events rather than lawn irrigation events. However, runoff losses were 40 times less using the revised application procedures recently specified on pyrethroid labels.

Original languageEnglish (US)
Pages (from-to)52-60
Number of pages9
JournalEnvironmental Toxicology and Chemistry
Volume33
Issue number1
DOIs
StatePublished - Jan 2014

Keywords

  • Field studies
  • Pyrethroids
  • Urban runoff

ASJC Scopus subject areas

  • Environmental Chemistry
  • Health, Toxicology and Mutagenesis

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