Abstract

The EPA’s proposed Drift Reduction Technology (DRT) low-speed wind tunnel evaluation protocol was tested across a series of modified ASAE reference nozzles. Both droplet size and deposition and flux volume measurements were made downwind from the nozzles operating in the tunnel at airspeeds of 1 m/s and 2.5 m/s, following the prescribed protocol. Overall, the data followed anticipated trends with a few unanticipated results observed, which could be addressed in future iterations of the protocol. There were some difficulties meeting the proposed protocol data quality requirements. Refined quality requirements would address this with no detrimental effect to the overall data set. Major concerns, at this point, are the feasibility of the overall protocol as well as the applicability of the final collected data. The protocol was tailored such that the collected data would directly input into a dispersion model (most likely WTDISP). However, not having access to such a model puts into question the validity and practicality of the protocol in its present form. Given the time requirements, which require approximately nine times that of the high speed protocol (90 min versus 10 min, unpublished data), there is a definite need to modify the existing protocol to insure equitable implementation of the overall DRT program.

References

1.
EPA
, “
Pesticide Registration (PR) Notice 2001-X Draft: Spray and Dust Drift Label Statements for Pesticide Products
,” http://www.epa.gov/PR_Notices/prdraft-spraydrift801.htm,
2001
.
2.
Sayles
,
G.
,
Birchfield
,
N.
, and
Ellenberger
,
J.
, “
US EPA’s Research Proposal for Encouraging the Use of Spray Drift Reduction Technologies
,” Proc. Int. Conf. on Pesticide Application for Drift Management, pp.
204
209
, http://pep.wsu.edu/drift04/proceedings.html
3.
Kosusko
,
M.
,
Bullock
,
K.
,
Birchfield
,
N.
, and
Hewitt
, A.
, “
Development of a Test Plan to Verify Pesticide Drift Reduction Technologies
,”
Proc. ASABE Annual Meeting
, Paper No. 061010,
American Society of Agricultural and Biological Engineers
,
St. Joseph, MI
,
2006
.
4.
EPA
, “
Pesticide Spray Drift Reduction Technologies: Verification and Incentives for Use
,” http://www.epa.gov/etop/forum/problem/progressreports/pest-spray-9-15-06.html
5.
EPA
, “
Environmental Technology Verification Program, Quality Management Plan
,” EPA Publication No. EPA/600/R-03/021, Office of Research and Development, U. S. Environmental Protection Agency.
6.
Hewitt
,
A.
, personal communication,
2008
.
7.
ASABE
, Standard S572, “
Spray Nozzle Classification by Droplet Spectra
,” American Society of Agricultural and Biological Engineers, St. Joseph, MI,
1999
.
8.
ASTM, Standard E1260, “
Standard Test Method for Determining Liquid Drop Size Characteristics in a Spray Using Optical Nonimaging Light-Scattering Instruments
,”
Annual Book of ASTM Standards
,
ASTM International
,
West Conshohocken, PA
,
2003
.
9.
ASTM, Standard E1620, “
Standard Terminology Relating to Liquid Particles and Atomization
,”
Annual Book of ASTM Standards
,
ASTM International
,
West Conshohocken, PA
,
2004
.
10.
Fritz
,
B. K.
, and
Hoffmann
,
W. C.
, “
Development of a System for Determining Collection Efficiency of Spray Samplers
,”
Appl. Eng. Agric.
 0883-8542, Vol.
24
No.
3
,
2008
, pp.
285
293
.
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