Abstract

A Buffalo Turbine barrier treatment sprayer was characterized physically and biologically over a range of application settings. The effects of three increasing droplet size distributions, two air blast strengths, and three blower arm angles (65°, 80°, and 90°) were measured via water sensitive papers and residual contact bioassay. The data from the water sensitive papers provided information on how machine setting influenced the deposition through the canopy. For the canopy under investigation, directing the spray straight into the canopy (90° blower angle) led to the highest deposit volumes. As droplet size distributions increased no significant change in the volume deposited was observed. The increase in air blast strength from low to high had no overall effect on the volume deposited, but the low air blast strength did show a successive loss in volume with distance into the canopy. Whereas the high air blast strength only showed a loss in volume at the furthest distance from the sprayer. Mosquito mortality did not correlate with volume deposited. Mosquito mortality was greatest with the intermediate blower arm angle (80°). The only parameter that correlated with mortality was uniformity of deposits over surfaces. It is suggested from both quantitative and qualitative observations that uniformity was the primary deposition parameter affecting control. The methods set forth in this study are simple and inexpensive our aim is to introduce them a standard methods for optimizing barrier treatment applications for vegetative barrier treatments.

References

1.
Cilek
,
J. E.
and
Halmon
,
C. F.
, “
Residual Effectiveness of Three Pyrethroids on Vegetation Against Aedes albopictus and Culex quinquefasciatus in Screened Field Cages
,”
J. Am. Mosq. Control Assoc.
 8756-971X, Vol.
24
,
2008
, pp.
263
269
. https://doi.org/10.2987/5653.1
2.
Hall
,
F. R.
and
Adams
,
A. J.
, “
Micro-Droplet Application for Determination of Comparative Topical and Residual Efficacy of Formulated Permethrin to Two Populations of Diamond Back Moth (Plutella xylostella L.)
,”
Pestic. Sci.
 0031-613X, Vol.
28
(
198
),
1990
, pp.
337
343
. https://doi.org/10.1002/ps.2780280312
3.
Hewitt
,
A. J.
and
Meganasa
,
T.
, “
Droplet Distribution Densities of a Pyrethroid Insecticide with Grass and Maize Canopies for the Control of Spodoptera exempta Larvae
,”
Crop Prot.
, Vol.
12
,
1993
, pp.
59
62
. https://doi.org/10.1016/0261-2194(93)90021-A
4.
ASABE S572,
2004
, “
Spray Nozzle Classification by Droplet Spectra
,” ASABE, St. Joseph, MI.
5.
Cilek
,
J. E.
and
Hallmon
,
C. F.
, “
Residual Effectiveness of Pyrethroid Treated Foliage Against Adult Ades albopictus and Culex quinquefasciatus in Screened Field Cages
,”
J. Am. Mosq. Control Assoc.
 8756-971X, Vol.
22
,
2006
, pp.
725
731
. https://doi.org/10.2987/8756-971X(2006)22[725:REOPFA]2.0.CO;2
6.
Yeomans
,
A. H.
and
Rogers
,
E. E.
, “
Factors Influencing Deposit of Spray Droplets
,”
J. Econ Entomol.
 0022-0493, Vol.
46
,
1953
, pp.
57
60
.
7.
Trout
,
R. T.
,
Brown
,
G. C.
,
Potter
,
M. F.
, and
Hubbard
,
J. L.
, “
Efficacy of Two Pyrethroid Insecticides Applied as Barrier Treatments for Managing Mosquito (Diptera culicidae) Populations in Suburban Residential Properties
,”
J. Econ Entomol.
 0022-0493, Vol.
44
,
2007
, pp.
470
477
.
8.
Anderson
,
A. L.
,
Apperson
,
C. S.
, and
Knake
,
R.
, “
Effectiveness of Mist Blower Applications of Malathion and Permethrin to Foliage as Barrier Sprays for Salt Marsh Mosquitoes
,”
J. Am. Mosq. Control Assoc.
 8756-971X, Vol.
7
,
1991
, pp.
116
117
.
9.
Perich
,
M. J.
,
Tidwell
,
M. A.
,
Dobson
,
S. E.
,
Sardelis
,
M. R.
,
Zagul
,
A.
, and
Williams
,
D. C.
, “
Barrier Spraying to Control the Malaria Vector Anopheles Albimanus: Laboratory and Field Evaluation in the Dominican Republic
,”
Med. Vet. Entomol.
 0269-283X, Vol.
7
,
1993
, pp.
363
368
. https://doi.org/10.1111/j.1365-2915.1993.tb00706.x
10.
World Health Organization (WHO)
, “
Guidelines for Testing Mosquito Adulticides for Indoor Residual Spraying and Treatment of Mosquito Nets
,” Ref: WHO/CDS/NTD/WHOPES/GCDPP/2006.3.
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