Accession Number:

ADA495153

Title:

Environmental Concentrations, Fate, and Risk Assessment of Pyrethrins and Piperonyl Butoxide After Aerial Ultralow-Volume Applications for Adult Mosquito Management

Descriptive Note:

Journal article

Corporate Author:

MONTANA STATE UNIV BOZEMAN DEPT OF LAND RESOURCES AND ENVIRONMENTAL SCIENCES

Report Date:

2008-01-01

Pagination or Media Count:

7.0

Abstract:

One of the most effective ways of managing adult mosquitoes that vector human and animals diseases is the use of ultralow-volume insecticides. Because of concerns about the safety of the insecticides used for the management of adult mosquitoes, we conducted an environmental fate and efficacy study in Princeton and Colusa both CA, USA after aerial applications of pyrethrins and piperonyl butoxide PBO. One hour before application, PBO concentrations in water were 0.008 and 0.2175 gL for Princeton and Colusa, respectively. One hour after the spray event in Princeton, the average PBO concentrations were 0.0125 gsq cm on ground-deposition pads and 0.1723 gL in water samples, with concentrations decreasing significantly over time. One hour after the spray event in Colusa, the average PBO concentrations were 0.0199 gsq cm on deposition pads and 1.274 gL in water samples, with concentrations decreasing significantly over time. A significant time and location effect for both deposition pads and water samples in Princeton and Colusa was observed p 0.001 and p 0.014, respectively. Pyrethrins were not detected in nearly all ground and water samples. One hour after application, mortality of Culex tarsalis and Culex pipiens in sentinel cages was significantly higher than at the control site for both locations p 0.001. Risk quotients for aquatic surrogate species in Princeton and Colusa were 0.002 or less at 1 h after application, which did not exceed the U.S. Environmental Protection Agency risk quotient level of concern for endangered aquatic organisms of 0.05. Our results suggest that the amounts of pyrethrins and PBO deposited on the ground and in water after aerial ULV insecticide applications are lower than those estimated by previous exposure and risk assessments.

Subject Categories:

  • Biochemistry
  • Biology
  • Ecology
  • Microbiology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE