Determining the drift potential of Venturi nozzles compared with standard nozzles across three insecticide spray solutions in a wind tunnel

Ferguson, J. Connor, Chechetto, Rodolfo G., O'Donnell, Chris C., Dorr, Gary J., Moore, John H., Baker, Greg J., Powis, Kevin J. and Hewitt, Andrew J. (2016) Determining the drift potential of Venturi nozzles compared with standard nozzles across three insecticide spray solutions in a wind tunnel. Pest Management Science, 72 8: 1460-1466. doi:10.1002/ps.4214


Author Ferguson, J. Connor
Chechetto, Rodolfo G.
O'Donnell, Chris C.
Dorr, Gary J.
Moore, John H.
Baker, Greg J.
Powis, Kevin J.
Hewitt, Andrew J.
Title Determining the drift potential of Venturi nozzles compared with standard nozzles across three insecticide spray solutions in a wind tunnel
Journal name Pest Management Science   Check publisher's open access policy
ISSN 1526-4998
1526-498X
Publication date 2016-08-01
Year available 2016
Sub-type Article (original research)
DOI 10.1002/ps.4214
Open Access Status Not yet assessed
Volume 72
Issue 8
Start page 1460
End page 1466
Total pages 7
Place of publication Chichester, West Sussex, United Kingdom
Publisher John Wiley & Sons
Collection year 2017
Language eng
Formatted abstract
Background: Previous research has sought to adopt the use of drift-reducing technologies (DRTs) for use in field trials to control diamondback moth (DBM) Plutella xylostella (L.) (Lepidoptera: Plutellidae) in canola (Brassica napus L.). Previous studies observed no difference in canopy penetration from fine to coarse sprays, but the coverage was higher for fine sprays. DBM has a strong propensity to avoid sprayed plant material, putting further pressure on selecting technologies that maximise coverage, but often this is at the expense of a greater drift potential. This study aims to examine the addition of a DRT oil that is labelled for control of DBM as well and its effect on the drift potential of the spray solution. The objectives of the study are to quantify the droplet size spectrum and spray drift potential of each nozzle type to select technologies that reduce spray drift, to examine the effect of the insecticide tank mix at both (50 and 100 L ha−1) application rates on droplet size and spray drift potential across tested nozzle type and to compare the droplet size results of each nozzle by tank mix against the drift potential of each nozzle.

Results: The nozzle type affected the drift potential the most, but the spray solution also affected drift potential. The fine spray quality (TCP) resulted in the greatest drift potential (7.2%), whereas the coarse spray quality (AIXR) resulted in the lowest (1.3%), across all spray solutions. The spray solutions mixed at the 100 L ha−1 application volume rate resulted in a higher drift potential than the same products mixed at the 50 L ha−1 mix rate. The addition of the paraffinic DRT oil was significant in reducing the drift potential of Bacillus thuringiensis var. kurstkai (Bt)-only treatments across all tested nozzle types. The reduction in drift potential from the fine spray quality to the coarse spray quality was up to 85%.

Conclusion: The addition of a DRT oil is an effective way to reduce the spray solution drift potential across all nozzle types and tank mixes evaluated in this study. The greatest reduction in drift potential can be achieved by changing nozzle type, which can reduce the losses of the spray to the surrounding environment. Venturi nozzles greatly reduce the drift potential compared with standard nozzles by as much as 85% across all three insecticide spray solutions. Results suggest that a significant reduction in drift potential can be achieved by changing the nozzle type, and can be achieved without a loss in control of DBM.
Keyword Diamondback moth
Drift reduction technologies
Insecticides
Nozzles
Spray drift
Wind tunnel
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Agriculture and Food Sciences
 
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