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Spatial and temporal distribution of airborne Bacillus thuringiensis var. kurstaki during an aerial spray program for gypsy moth eradication.
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MedLine Citation:
PMID:  11171524     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
We measured airborne exposures to the biological insecticide Bacillus thuringiensis var. kurstaki (Btk) during an aerial spray program to eradicate gypsy moths on the west coast of Canada. We aimed to determine whether staying indoors during spraying reduced exposures, to determine the rate of temporal decay of airborne concentrations, and to determine whether drift occurred outside the spray zone. During spraying, the average culturable airborne Btk concentration measured outdoors within the spray zone was 739 colony-forming units (CFU)/m3 of air. Outdoor air concentrations decreased over time, quickly in an initial phase with a half time of 3.3 hr, and then more slowly over the following 9 days, with an overall half-time of about 2.4 days. Inside residences during spraying, average concentrations were initially 2-5 times lower than outdoors, but at 5-6 hr after spraying began, indoor concentrations exceeded those outdoors, with an average of 244 CFU/m3 vs. 77 CFU/m3 outdoors, suggesting that the initial benefits of remaining indoors during spraying may not persist as outside air moves indoors with normal daily activities. There was drift of culturable Btk throughout a 125- to 1,000-meter band outside the spray zone where measurements were made, a consequence of the fine aerosol sizes that remained airborne (count median diameters of 4.3 to 7.2 microm). Btk concentrations outside the spray zone were related to wind speed and direction, but not to distance from the spray zone.
Authors:
K Teschke; Y Chow; K Bartlett; A Ross; C van Netten
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Environmental health perspectives     Volume:  109     ISSN:  0091-6765     ISO Abbreviation:  Environ. Health Perspect.     Publication Date:  2001 Jan 
Date Detail:
Created Date:  2001-02-22     Completed Date:  2001-04-12     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0330411     Medline TA:  Environ Health Perspect     Country:  United States    
Other Details:
Languages:  eng     Pagination:  47-54     Citation Subset:  IM    
Affiliation:
Department of Health Care and Epidemiology, University of British Columbia, Vancouver, British Columbia, Canada. teschke@interchange.ubc.ca
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MeSH Terms
Descriptor/Qualifier:
Aerosols
Air Movements
Air Pollution, Indoor*
Animals
Bacillus thuringiensis*
Environmental Exposure*
Environmental Monitoring*
Insect Control*
Moths
Particle Size
Public Health
Chemical
Reg. No./Substance:
0/Aerosols
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Full Text
Journal Information
Journal ID (nlm-ta): Environ Health Perspect
ISSN: 0091-6765
Article Information
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Print publication date: Month: 1 Year: 2001
Volume: 109 Issue: 1
First Page: 47 Last Page: 54
ID: 1242050
PubMed Id: 11171524
Publisher Item Identifier: sc271_5_1835

Spatial and temporal distribution of airborne Bacillus thuringiensis var. kurstaki during an aerial spray program for gypsy moth eradication.
K Teschke
Y Chow
K Bartlett
A Ross
C van Netten
Department of Health Care and Epidemiology, University of British Columbia, Vancouver, British Columbia, Canada. teschke@interchange.ubc.ca


Article Categories:
  • Research Article


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