The University of Queensland

Challenges and opportunities of unmanned aerial vehicles as a new tool for crop pest control

Zhang, Ruirui, Hewitt, Andrew J, Chen, Liping, Li, Longlong and Tang, Qing (2023). Challenges and opportunities of unmanned aerial vehicles as a new tool for crop pest control. Pest Management Science, 79 (11), 4123-4131. doi: 10.1002/ps.7683

Editorial: Advanced technologies of UAV application in crop pest, disease and weed control

Zhang, Ruirui, Hewitt, Andrew, Li, Longlong, Yuan, Huizhu, Ferguson, J. Connor and Chen, Liping (2023). Editorial: Advanced technologies of UAV application in crop pest, disease and weed control. Frontiers in Plant Science, 14 1253841. doi: 10.3389/fpls.2023.1253841

Analysis of the spatial and temporal distribution of a spray cloud using commercial LiDAR

Liu, Boqin, Li, Longlong, Zhang, Ruirui, Tang, Qing, Ding, Chenchen, Xu, Gang, Hewitt, Andrew John and Chen, Liping (2022). Analysis of the spatial and temporal distribution of a spray cloud using commercial LiDAR. Biosystems Engineering, 223, 78-96. doi: 10.1016/j.biosystemseng.2022.08.017

Effects of application height and crosswind on the crop spraying performance of unmanned helicopters

Tang, Qing, Chen, Liping, Zhang, Ruirui, Deng, Wei, Xu, Min, Xu, Gang, Li, Longlong and Hewitt, Andrew (2021). Effects of application height and crosswind on the crop spraying performance of unmanned helicopters. Computers and Electronics in Agriculture, 181 105961, 1-18. doi: 10.1016/j.compag.2020.105961

Development of sensor system for real-time measurement of droplet deposition of agricultural sprayers

Li, Longlong, Zhang, Ruirui, Chen, Liping, Yi, Tongchuan, Xu, Gang, Xue, Daxuan, Tang, Qing, Zhang, Linhuan, Hewitt, Andrew John and An, Yining (2021). Development of sensor system for real-time measurement of droplet deposition of agricultural sprayers. International Journal of Agricultural and Biological Engineering, 14 (5), 19-26. doi: 10.25165/j.ijabe.20211405.5528

Numerical simulation of the downwash flow field and droplet movement from an unmanned helicopter for crop spraying

Tang, Qing, Zhang, Ruirui, Chen, Liping, Deng, Wei, Xu, Min, Xu, Gang, Li, Longlong and Hewitt, Andrew (2020). Numerical simulation of the downwash flow field and droplet movement from an unmanned helicopter for crop spraying. Computers and Electronics in Agriculture, 174 105468, 1-14. doi: 10.1016/j.compag.2020.105468

Adjuvant's influence to droplet size based on forestry pests' prevention with ground and air chemical application

Zhang, Huichun, Zhou, Hongping, Zheng, Jiaqiang, Liao, Juan and Hewitt, Andrew J. (2020). Adjuvant's influence to droplet size based on forestry pests' prevention with ground and air chemical application. Linye Kexue/Scientia Silvae Sinicae, 56 (5), 118-129. doi: 10.11707/j.1001-7488.20200514

Analysis of the influence of different parameters on droplet characteristics and droplet size classification categories for air induction nozzle

Liao, Juan, Luo, Xiwen, Wang, Pei, Zhou, Zhiyan, O’Donnell, Chris C., Zang, Ying and Hewitt, Andrew J. (2020). Analysis of the influence of different parameters on droplet characteristics and droplet size classification categories for air induction nozzle. Agronomy, 10 (2) 256, 256. doi: 10.3390/agronomy10020256

The relations of leaf area index with the spray quality and efficacy of cotton defoliant spraying using unmanned aerial systems (UASs)

Liao, Juan, Zang, Ying, Luo, Xiwen, Zhou, Zhiyan, Zang, Yu, Wang, Pei and Hewitt, Andrew John (2020). The relations of leaf area index with the spray quality and efficacy of cotton defoliant spraying using unmanned aerial systems (UASs). Computers and Electronics in Agriculture, 169 105228, 105228. doi: 10.1016/j.compag.2020.105228

Meteorological and flight altitude effects on deposition, penetration, and drift in pineapple aerial spraying

Wang, Juan, Lan, Yubin, Wen, Sheng, Hewitt, Andrew John, Yao, Weixiang and Chen, Pengchao (2020). Meteorological and flight altitude effects on deposition, penetration, and drift in pineapple aerial spraying. Asia-Pacific Journal of Chemical Engineering, 15 (1) e2382. doi: 10.1002/apj.2382

Comparison of water-sensitive paper, Kromekote and Mylar collectors for droplet deposition with a visible fluorescent dye solution

Ferguson, J. Connor, Hewitt, Andrew J., O’Donnell, Chris C. and Kruger, Greg R. (2020). Comparison of water-sensitive paper, Kromekote and Mylar collectors for droplet deposition with a visible fluorescent dye solution. Journal of Plant Protection Research, 60 (1), 98-105. doi: 10.24425/jppr.2020.132210

Development of droplet characteristics prediction models for air induction nozzles based on wind tunnel tests

Liao, Juan, Hewitt, Andrew John, Wang, Pei, Luo, Xiwen, Zang, Ying, Zhou, Zhiyan, Lan, Yubin and O'Donnell, Chris (2019). Development of droplet characteristics prediction models for air induction nozzles based on wind tunnel tests. International Journal of Agricultural and Biological Engineering, 12 (6), 1-6. doi: 10.25165/j.ijabe.20191206.5014

A new spray deposition pattern measurement system based on spectral analysis of a fluorescent tracer

Wen, Yao, Zhang, Ruirui, Chen, Liping, Huang, Yanbo, Yi, Tongchuan, Xu, Gang, Li, Longlong and Hewitt, Andrew John (2019). A new spray deposition pattern measurement system based on spectral analysis of a fluorescent tracer. Computers and Electronics in Agriculture, 160, 14-22. doi: 10.1016/j.compag.2019.03.008

Optimization of variables for maximizing efficacy and efficiency in aerial spray application to cotton using unmanned aerial systems

Liao, Juan, Zang, Ying, Luo, Xiwen, Zhou, Zhiyan, Lan, Yubin, Zang, Yu, Gu, Xiuyan, Xu, Weiming and Hewitt, Andrew John (2019). Optimization of variables for maximizing efficacy and efficiency in aerial spray application to cotton using unmanned aerial systems. International Journal of Agricultural and Biological Engineering, 12 (2), 10-17. doi: 10.25165/j.ijabe.20191202.4288

Droplet-size effects on control of Chloris spp. with six POST herbicides

Ferguson, J. Connor, Chauhan, Bhagirath S., Chechetto, Rodolfo G., Hewitt, Andrew J., Adkins, Steve W., Kruger, Greg R. and O'Donnell, Chris C. (2019). Droplet-size effects on control of Chloris spp. with six POST herbicides. Weed Technology, 33 (1), 153-158. doi: 10.1017/wet.2018.99

脉宽调制变量控制喷头雾化性能及风洞环境雾滴沉积特性

Zhang, Ruirui, Li, Longlong, Fu, Wang, Chen, Liping, Yi, Tongchuan, Tang, Qing and Hewitt, Andrew J. (2019). 脉宽调制变量控制喷头雾化性能及风洞环境雾滴沉积特性. Nongye Gongcheng Xuebao, 35 (3), 42-51. doi: 10.11975/j.issn.1002-6819.2019.03.006

Field evaluation of an unmanned aerial vehicle (UAV) sprayer: effect of spray volume on deposition and the control of pests and disease in wheat

Wang, Guobin, Lan, Yubin, Qi, Haixia, Chen, Pengchao, Hewitt, Andrew and Han, Yuxing (2019). Field evaluation of an unmanned aerial vehicle (UAV) sprayer: effect of spray volume on deposition and the control of pests and disease in wheat. Pest Management Science, 75 (6), 1546-1555. doi: 10.1002/ps.5321

喷雾助剂类型及浓度对喷头雾化效果影响

Zhang, Ruirui, Zhang, Zhen, Xu, Gang, Chen, Liping and Hewitt, Andrew J. (2018). 喷雾助剂类型及浓度对喷头雾化效果影响. Nongye Gongcheng Xuebao, 34 (20), 36-43. doi: 10.11975/j.issn.1002-6819.2018.20.005

Effect of spray droplet size on herbicide efficacy on four winter annual grasses

Ferguson, J. Connor, Chechetto, Rodolfo G., Adkins, Steve W., Hewitt, Andrew J., Chauhan, Bhagirath S., Kruger, Greg R. and O'Donnell, Chris C. (2018). Effect of spray droplet size on herbicide efficacy on four winter annual grasses. Crop Protection, 112, 118-124. doi: 10.1016/j.cropro.2018.05.020

Field Measurements of Drift of Conventional and Drift Control Formulations of 2,4-D Plus Glyphosate

Havens, Patrick L., Hillger, David E., Hewitt, Andrew J., Kruger, Greg R., Marchi-Werle, Lia and Czaczyk, Zbigniew (2018). Field Measurements of Drift of Conventional and Drift Control Formulations of 2,4-D Plus Glyphosate. Weed Technology, 32 (5), 550-556. doi: 10.1017/wet.2018.55

Drift measurements for two systems of hydrogen cyanamide spraying in kiwifruit

Connell, Robert, Post, Scott, Ledebuhr, Mark, Moorhead, Brian and Hewitt, Andrew (2018). Drift measurements for two systems of hydrogen cyanamide spraying in kiwifruit. New Zealand Plant Protection, 71, 19-24. doi: 10.30843/nzpp.2018.71.186

Flat-fan spray atomization model

Post, S. L. and Hewitt, A. J. (2018). Flat-fan spray atomization model. Transactions of the ASABE, 61 (4), 1249-1256. doi: 10.13031/trans.12572

Laboratory measurements of evaporation rate of droplets at low relative wind speed

Teske, M. E., Thistle, H. W., Riley, C. M. and Hewitt, A. J. (2018). Laboratory measurements of evaporation rate of droplets at low relative wind speed. Transactions of the ASABE, 61 (3), 919-923. doi: 10.13031/trans.12743

Wind tunnel flux comparisons using a phase Doppler interferometer

Roten, Roy L., Post, Scott L., Werner, Armin, Safa, Majeed and Hewitt, Andrew J. (2017). Wind tunnel flux comparisons using a phase Doppler interferometer. Journal of Plant Protection Research, 57 (3), 281-287. doi: 10.1515/jppr-2017-0040

Phase doppler quantification of agricultural spray compared with traditional sampling materials

Roten, R. L., Post, S. L., Werner, A., Safa, M. and Hewitt, A. J. (2017). Phase doppler quantification of agricultural spray compared with traditional sampling materials. New Zealand Plant Protection, 70, 142-151. doi: 10.30843/nzpp.2017.70.40

Aerially released spray penetration in a tall coniferous forest canopy

Thistle, H. W., Reardon, R. C., Bonds, J. A. S., Fritz, B. L., Hoffmann, W. C., Kees, G. J., Grob, I. J., Hewitt, A. J., O'Donnell, C. C., Felton, K. D. and Onken, B. P. (2017). Aerially released spray penetration in a tall coniferous forest canopy. Transactions of the ASABE, 59 (5), 1221-1231. doi: 10.13031/trans.59.11872

Pressure, droplet size classification, and nozzle arrangement effects on coverage and droplet number density using air-inclusion dual fan nozzles for pesticide applications

Ferguson, J. Connor, Hewitt, Andrew J. and O'Donnell, Chris C. (2016). Pressure, droplet size classification, and nozzle arrangement effects on coverage and droplet number density using air-inclusion dual fan nozzles for pesticide applications. Crop Protection, 89, 231-238. doi: 10.1016/j.cropro.2016.07.032

Assessing a novel smartphone application – SnapCard, compared to five imaging systems to quantify droplet deposition on artificial collectors

Ferguson, J. Connor, Chechetto, Rodolfo G., O'Donnell, Chris C., Fritz, Brad K., Hoffmann, W. Clint, Coleman, Chet E., Chauhan, Bhagirath S., Adkins, Steve W., Kruger, Greg R. and Hewitt, Andrew J. (2016). Assessing a novel smartphone application – SnapCard, compared to five imaging systems to quantify droplet deposition on artificial collectors. Computers and Electronics in Agriculture, 128, 193-198. doi: 10.1016/j.compag.2016.08.022

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

Impacts of polymer/surfactant interactions on spray drift

Wang, Ruobing, Dorr, Gary, Hewitt, Andrew and Cooper-White, Justin (2016). Impacts of polymer/surfactant interactions on spray drift. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 500, 88-97. doi: 10.1016/j.colsurfa.2016.03.056

Assessing the deposition and canopy penetration of nozzles with different spray qualities in an oat (Avena sativa L.) canopy

Ferguson, J. Connor, Chechetto, Rodolfo G., Hewitt, Andrew J., Chauhan, Bhagirath S., Adkins, Steve W., Kruger, Greg R. and O'Donnell, Chris C. (2016). Assessing the deposition and canopy penetration of nozzles with different spray qualities in an oat (Avena sativa L.) canopy. Crop Protection, 81, 14-19. doi: 10.1016/j.cropro.2015.11.013

Initial laboratory measurements of the evaporation rate of droplets inside a spray cloud

Teske, Milton E., Thistle, Harold W., Riley, Christopher M. and Hewitt, Andrew J. (2016). Initial laboratory measurements of the evaporation rate of droplets inside a spray cloud. Transactions of the ASABE, 59 (2), 487-493. doi: 10.13031/trans.59.11543

Volumetric validation of mass balance using a computational phase Doppler approach for disc core nozzles

Roten, R. L., Post, S. L., Werner, A., Hewitt, A. J. and Safa, M. (2016). Volumetric validation of mass balance using a computational phase Doppler approach for disc core nozzles. Crop Protection, 79, 128-134. doi: 10.1016/j.cropro.2015.10.018

Retention and efficacy of ultra-low volume pesticide applications on Culex quinquefasciatus (Diptera: Culicidae)

Zhang, Huichun, Dorr, Gary J. and Hewitt, Andrew J. (2015). Retention and efficacy of ultra-low volume pesticide applications on Culex quinquefasciatus (Diptera: Culicidae). Environmental Science and Pollution Research, 22 (21), 16492-16501. doi: 10.1007/s11356-015-5480-9

Determining the uniformity and consistency of droplet size across spray drift reducing nozzles in a wind tunnel

Ferguson, J. Connor, O'Donnell, Chris C., Chauhan, Bhagirath S., Adkins, Steve W., Kruger, Greg R., Wang, Ruobing, Urach Ferreira, Pedro H. and Hewitt, Andrew J. (2015). Determining the uniformity and consistency of droplet size across spray drift reducing nozzles in a wind tunnel. Crop Protection, 76, 1-6. doi: 10.1016/j.cropro.2015.06.008

Performance of postemergence herbicides applied at different carrier volume rates

Creech, Cody F., Henry, Ryan S., Werle, Rafael, Sandell, Lowell D., Hewitt, Andrew J. and Kruger, Greg R. (2015). Performance of postemergence herbicides applied at different carrier volume rates. Weed Technology, 29 (3), 611-624. doi: 10.1614/WT-D-14-00101.1

Optimizing pesticide spray coverage using a novel web and smartphone tool, SnapCard

Nansen, Christian, Ferguson, J. Connor, Moore, John, Groves, Lloyd, Emery, Rob, Garel, Nicolas and Hewitt, Andrew (2015). Optimizing pesticide spray coverage using a novel web and smartphone tool, SnapCard. Agronomy for Sustainable Development, 35 (3), 1075-1085. doi: 10.1007/s13593-015-0309-y

Exposure to TCDD from base perimeter application of Agent Orange in Vietnam

Ross, John H., Hewitt, Andrew, Armitage, James, Solomon, Keith, Watkins, Deborah K. and Ginevan, Michael E. (2015). Exposure to TCDD from base perimeter application of Agent Orange in Vietnam. Science of the Total Environment, 511, 82-90. doi: 10.1016/j.scitotenv.2014.11.083

Handler, bystander and reentry exposure to TCDD from application of Agent Orange by C-123 aircraft during the Vietnam War

Ross, John H., Hewitt, Andrew, Armitage, James, Solomon, Keith, Watkins, Deborah K. and Ginevan, Michael E. (2015). Handler, bystander and reentry exposure to TCDD from application of Agent Orange by C-123 aircraft during the Vietnam War. Science of the Total Environment, 505, 514-525. doi: 10.1016/j.scitotenv.2014.10.005

Comparison of spray dose measured on leaf surfaces with spray coverage estimated from Kromekote® paper

Roten, R. L., Connell, R. J., Hewitt, A. J. and Woodward, S. J. R. (2015). Comparison of spray dose measured on leaf surfaces with spray coverage estimated from Kromekote® paper. New Zealand Plant Protection, 68, 38-43. doi: 10.30843/nzpp.2015.68.5796

Environmental fate and dietary exposures of humans to TCDD as a result of the spraying of Agent Orange in upland forests of Vietnam

Armitage, James M., Ginevan, Michael E., Hewitt, Andrew, Ross, John H., Watkins, Deborah K. and Solomon, Keith R. (2015). Environmental fate and dietary exposures of humans to TCDD as a result of the spraying of Agent Orange in upland forests of Vietnam. Science of the Total Environment, 506-507, 621-630. doi: 10.1016/j.scitotenv.2014.11.026

Rotary atomiser design requirements for optimum pesticide application efficiency

Craig, Ian P., Hewitt, Andrew and Terry, Howard (2014). Rotary atomiser design requirements for optimum pesticide application efficiency. Crop Protection, 66, 34-39. doi: 10.1016/j.cropro.2014.08.012

Testing flow-through air samplers for use in near-field vapour drift studies by measuring pyrimethanil in air after spraying

Geoghegan, Trudyanne S., Hageman, Kimberly J. and Hewitt, Andrew J. (2014). Testing flow-through air samplers for use in near-field vapour drift studies by measuring pyrimethanil in air after spraying. Environmental Sciences: Processes and Impacts, 16 (3), 422-432. doi: 10.1039/c3em00498h

A new pest management research facility: Scion's large-scale precision track sprayer

Gous, S. F., Withers, T. M. and Hewitt, A. J. (2014). A new pest management research facility: Scion's large-scale precision track sprayer. New Zealand Plant Protection, 67, 267-273. doi: 10.30843/nzpp.2014.67.5724

Comparison of drop size data from ground and aerial application nozzles at three testing laboratories

Fritz, Bradley K., Hoffmann, W. Clint, Kruger, Greg R., Henry, Ryan S., Hewitt, Andrew and Czaczyk, Zbigniew (2014). Comparison of drop size data from ground and aerial application nozzles at three testing laboratories. Atomization and Sprays, 24 (2), 181-192. doi: 10.1615/AtomizSpr.2013009668

Developing a comprehensive drift reduction technology risk assessment scheme

Ferguson, J. Connor, Hewitt, Andrew J., Eastin, John A., Connell, Robert J., Roten, Rory L. and Kruger, Greg R. (2014). Developing a comprehensive drift reduction technology risk assessment scheme. Journal of Plant Protection Research, 54 (1), 85-89. doi: 10.2478/jppr-2014-0013

Drift reducing potential of low drift nozzles with the use of spray-hoods

Roten, R.L., Ferguson, J.C. and Hewitt, A.J. (2014). Drift reducing potential of low drift nozzles with the use of spray-hoods. New Zealand Plant Protection, 67, 274-277. doi: 10.30843/nzpp.2014.67.5725

A comparison of initial spray characteristics produced by agricultural nozzles

Dorr, Gary J., Hewitt, Andrew J., Adkins, Steve W., Hanan, Jim, Zhang, Huichun and Noller, Barry (2013). A comparison of initial spray characteristics produced by agricultural nozzles. Crop Protection, 53, 109-117. doi: 10.1016/j.cropro.2013.06.017

Evaluation of spray deposition in potatoes using various spray delivery systems

Roten, R. L., Hewitt, A. J., Ledebuhr, M., Thistle, H., Connell, R. J., Wolf, T. M., Sankar, S. and Woodward, S. J. R. (2013). Evaluation of spray deposition in potatoes using various spray delivery systems. New Zealand Plant Protection, 66, 317-323. doi: 10.30843/nzpp.2013.66.5706

Droplet size classification of air induction flat fan nozzles

Czaczyk, Zbigniew, Kruger, Greg and Hewitt, Andrew (2012). Droplet size classification of air induction flat fan nozzles. Journal of Plant Protection Research, 52 (4), 415-420. doi: 10.2478/v10045-012-0068-6

Field scale evaluation of spray drift reduction technologies from ground and aerial application systems

Fritz, Bradley, K., Hoffman, W. Clint, Bagley, W. E. and Hewitt, Andrew (2011). Field scale evaluation of spray drift reduction technologies from ground and aerial application systems. Journal of ASTM International, 8 (5), 1-11. doi: 10.1520/JAI103457

Evaluation of spray drift using low-speed wind tunnel measurements and dispersion

Fritz, Bradley. K., Hoffmann, W. Clint, Birchfield, Norman B., Ellenberger, Jay, Kahn, Faruque, Bagley, W. E., Thornburg, Jonathan W. and Hewitt, Andrew (2010). Evaluation of spray drift using low-speed wind tunnel measurements and dispersion. Journal of ASTM International (JAI), 7 (6), 1-14. doi: 10.1520/JAI102775

Spray droplet size, drift potential, and risks to nontarget organisms from aerially applied glyphosate for coca control in Colombia

Hewitt, A.J., Solomon, K.R. and Marshall, E.J.P. (2009). Spray droplet size, drift potential, and risks to nontarget organisms from aerially applied glyphosate for coca control in Colombia. Journal of Toxicology and Environmental Health, Part A, 72 (15-16), 921-929. doi: 10.1080/15287390902929667

Droplet size spectra classification categories in aerial application scenarios

Hewitt, A. J. (2008). Droplet size spectra classification categories in aerial application scenarios. Crop Protection, 27 (9), 1284-1288. doi: 10.1016/j.cropro.2008.03.010

Spray adjuvant effects on droplet size spectra measured by three laser-based systems in a high-speed wind tunnel

Clint Hoffmann, W., Hewitt, A. J., Ross, J. B., Bagley, W. E., Martin, D. E. and Fritz, B. K. (2008). Spray adjuvant effects on droplet size spectra measured by three laser-based systems in a high-speed wind tunnel. Journal of ASTM International, 5 (6), 101233. doi: 10.1520/JAI101233

Spray deposition on plant surfaces: a modelling approach

Dorr, Gary, Hanan, Jim, Adkins, Steve, Hewitt, Andrew, O'Donnell, Chris and Noller, Barry (2008). Spray deposition on plant surfaces: a modelling approach. Functional Plant Biology, 35 (9/10), 988-996. doi: 10.1071/FP08056

Comparison of three imaging systems for water-sensitive papers

Hoffmann, Wesley Clint and Hewitt, Andrew J. (2005). Comparison of three imaging systems for water-sensitive papers. Applied Engineering in Agriculture, 21 (6), 961-964.

Predicted deposition variability due to fluctuations in release height and drop size distribution

Teske, Milton E., Thistle, Harold W., Reardon, Richard C., Cormier, Gerry, Amirault, Peter, Davies, David C., Scott Cameron, R., Dorr, Gary, Hewitt, Andrew J., Brown, James R., LeClere, Monique Y. and Karipot, Anandakumar (2005). Predicted deposition variability due to fluctuations in release height and drop size distribution. Journal of ASTM International, 2 (4), 283-293. doi: 10.1520/JAI12164

Rotary atomizer drop size distribution database

Teske, M. E., Thistle, H. W., Hewitt, A. J., Kirk, I. W., Dexter, R. W. and Ghent, J. H. (2005). Rotary atomizer drop size distribution database. Transactions of the ASABE, 48 (3), 917-921. doi: 10.13031/2013.18496

Droplet evaporation corrections for aerial spray drift modeling I: Theoretical considerations

Teske, Milton E., Kaufman, Andrew E., Thistle, Harold W., Hewitt, Andrew J. and Valcore, David L. (2003). Droplet evaporation corrections for aerial spray drift modeling I: Theoretical considerations. Atomization and Sprays, 13 (2-3), 243-250. doi: 10.1615/atomizspr.v13.i23.50

Conversion of droplet size distributions from PMS optical array probe to Malvern laser diffraction

Teske, Milton E., Thistle, Harold W., Hewitt, Andrew J. and Kirk, I. W. (2002). Conversion of droplet size distributions from PMS optical array probe to Malvern laser diffraction. Atomization and Sprays, 12 (1-3), 267-281. doi: 10.1615/atomizspr.v12.i123.140

Development of the spray drift task force database for aerial applications

Hewitt, Andrew J., Johnson, David R., Fish, John D., Hermansky, Clarence G. and Valcore, David L. (2002). Development of the spray drift task force database for aerial applications. Environmental Toxicology and Chemistry, 21 (3), 648-658. doi: 10.1002/etc.5620210326

Analyses of equipment, meteorology and other factors affecting drift from applications of sprays by ground rig sprayers

Hewitt, Andrew J., Valcore, D. L. and Barry, T. (2001). Analyses of equipment, meteorology and other factors affecting drift from applications of sprays by ground rig sprayers. ASTM Special Technical Publication (1400), 44-56. doi: 10.1520/stp10433s

Developments in international harmonization of pesticide drift management

Hewitt, A. J. (2001). Developments in international harmonization of pesticide drift management. Phytoparasitica, 29 (2), 93-96. doi: 10.1007/BF02983952

Spray drift: Impact of requirements to protect the environment

Hewitt, A. J. (2000). Spray drift: Impact of requirements to protect the environment. Crop Protection, 19 (8-10), 623-627. doi: 10.1016/S0261-2194(00)00082-X

The formation of a new ASTM E35.22 task group to address drift management adjuvants

Hewitt, Andrew J., Stern, A. J., Bagley, W. E. and Dexter, R. (1999). The formation of a new ASTM E35.22 task group to address drift management adjuvants. ASTM Special Technical Publication (1373), 135-148.

Relative drift potential and droplet size spectra of aerially applied propanil formulations

Sanderson, R., Hewitt, A. J., Huddlestor, E. W. and Ross, J. B. (1997). Relative drift potential and droplet size spectra of aerially applied propanil formulations. Crop Protection, 16 (8), 717-721. doi: 10.1016/S0261-2194(97)00064-1

Droplet size and agricultural spraying, Part I: Atomization, spray transport, deposition, drift, and droplet size measurement techniques

Hewitt, Andrew (1997). Droplet size and agricultural spraying, Part I: Atomization, spray transport, deposition, drift, and droplet size measurement techniques. Atomization and Sprays, 7 (3), 235-244. doi: 10.1615/AtomizSpr.v7.i3.10

Comparison of the droplet size spectra produced by rotary atomizers and hydraulic nozzles under simulated aerial application conditions

Hewitt, A. J., Sanderson, R., Huddleston, E. W. and Robinson, A. G. (1994). Comparison of the droplet size spectra produced by rotary atomizers and hydraulic nozzles under simulated aerial application conditions. Journal of Environmental Science and Health, Part B, 29 (4), 647-660. doi: 10.1080/03601239409372898

Polymer and invert emulsifying oil effects upon droplet size spectra of sprays

Sanderson, R., Hewitt, A. J., Huddleston, E. W. and Ross, J. B. (1994). Polymer and invert emulsifying oil effects upon droplet size spectra of sprays. Journal of Environmental Science and Health, Part B, 29 (4), 815-829. doi: 10.1080/03601239409372905

Droplet distribution densities of a pyrethroid insecticide within grass and maize canopies for the control of Spodoptera exempta larvae

Hewitt, A. J. and Meganasa, T. (1993). Droplet distribution densities of a pyrethroid insecticide within grass and maize canopies for the control of Spodoptera exempta larvae. Crop Protection, 12 (1), 59-62. doi: 10.1016/0261-2194(93)90021-A

Droplet size spectra produced by air-assisted atomizers

Hewitt, A.J (1993). Droplet size spectra produced by air-assisted atomizers. Journal of Aerosol Science, 24 (2), 155-162. doi: 10.1016/0021-8502(93)90055-E

Droplet size spectra produced by the X15 stacked spinning-disc atomizer of the Ulvamast Mark II sprayer

Hewitt, A. J. (1992). Droplet size spectra produced by the X15 stacked spinning-disc atomizer of the Ulvamast Mark II sprayer. Crop Protection, 11 (3), 221-224. doi: 10.1016/0261-2194(92)90040-C

Herbicide spray penetration into corn and soybean canopies using air-induction nozzles and a drift control adjuvant

Creech, Cody F., Henry, Ryan S., Hewitt, Andrew J. and Kruger, Greg R. (2018). Herbicide spray penetration into corn and soybean canopies using air-induction nozzles and a drift control adjuvant. Cambridge, United Kingdom: Cambridge University Press. doi: 10.1017/wet.2017.84

Is Retention the Old-New Problem in a Drift-Control Era?

Costa, Fernanda, Forster, W. Alison, Favaro, Cintia, Golfetti da Silva, Vanessa R. and Hewitt, Andrew (2018). Is Retention the Old-New Problem in a Drift-Control Era?. 38th Symposium on Pesticide Formulation and Delivery Systems: Innovative Application, Formulation, and Adjuvant Technologies, New Orleans LA United States, 10-12 October 2017. West Conshohocken, PA United States: A S T M International. doi: 10.1520/STP167020770213

Phase doppler flux comparisons

Roten, Rory, Post, Scott and Hewitt, Andrew (2016). Phase doppler flux comparisons. 2016 ASABE Annual International Meeting, Orlando, Florida, United States, 17-20 July 2016. St Joseph, MI, United States: American Society of Agricultural and Biological Engineers. doi: 10.13031/aim.20162461508

Preliminary investigation of Phase Doppler derived flux measurements in a wind tunnel for the sampling of orchard spray drift

Roten, R. L., Ferguson, J. C., Connell, R. J., Dorr, G. J. and Hewitt, A. J. (2015). Preliminary investigation of Phase Doppler derived flux measurements in a wind tunnel for the sampling of orchard spray drift. 13th Workshop on Spray Application in Fruit Growing, Lindau Germany, Jul 15-18, 2015. Germany: Julius Kühn-Institut. doi: 10.5073/jka.2015.448.000

Effect of interaction in polymer-surfactant systems on spray drift

Wang, Ruobing, Dorr, Gary, Hewitt, Andrew and Cooper-White, Justin (2014). Effect of interaction in polymer-surfactant systems on spray drift. 248th National Meeting of the American Chemical Society (ACS), San Francisco CA, United States, 10-14 August 2014. Washington, DC United States: American Chemical Society.

Evaluation of models for ground-based pesticide application systems

Hewitt, Andrew (2014). Evaluation of models for ground-based pesticide application systems. 248th National Meeting of the American Chemical Society (ACS), San Francisco CA, United States, 10-14 August 2014. Washington, DC United States: American Chemical Society.

How conformation change in polymer-surfactant system influence spray performance through flat fan nozzle

Wang, Ruobing, Door, Gary, Hewitt, Andrew and Cooper-White, Justin (2014). How conformation change in polymer-surfactant system influence spray performance through flat fan nozzle. 248th National Meeting of the American Chemical Society (ACS), San Francisco CA, United States, 10-14 August 2014. Washington, DC United States: American Chemical Society.

Wireless mobile device for counting and measuring spray droplets

Kateley, Stephen, Hewitt, Andrew, Brady, Mick and Goddard, Richard (2014). Wireless mobile device for counting and measuring spray droplets. 248th National Meeting of the American Chemical Society (ACS), San Francisco CA, United States, 10-14 August 2014. Washington, DC United States: American Chemical Society.

Ground spray drift modeling for pesticide application

Hewitt, Andrew (2013). Ground spray drift modeling for pesticide application. 246th National Meeting of the American Chemical Society (ACS), Indianapolis, IN United States, 8 - 12 September 2013. Washington, DC United States: American Chemical Society.

Evaluation of spray drift using low-speed wind tunnel measurements and dispersion modeling

Fritz, Bradley K., Hoffmann, W. Clint, Birchfield, Norman B., Ellenberger, Jay, Khan, Faruque, Bagley, W. E., Thornburg, Jonathan W. and Hewitt, Andrew (2011). Evaluation of spray drift using low-speed wind tunnel measurements and dispersion modeling. ASTM International. doi: 10.1520/stp152720120018

Field scale evaluation of spray drift reduction technologies from ground and aerial application systems

Fritz, Bradley K., Hoffmann, W. Clint, Bagley, W. E. and Hewitt, Andrew (2011). Field scale evaluation of spray drift reduction technologies from ground and aerial application systems. ASTM International. doi: 10.1520/stp153720120013

AGDISP Model Developments in USA, Australia and New Zealand

Hewitt, Andrew J., Forster, Alison, Teske, Milton E. and Thistle, Harold W. (2010). AGDISP Model Developments in USA, Australia and New Zealand. ForestTECH 2010 - Technologies to Improve Forest Planning, Albury, New South Wales, Australia, 22 - 24 November 2010.

Attenuation of aerially applied spray within a riparian management area

Ice. W., Thistle, H., Karsky, R. and Hewitt, A. (2010). Attenuation of aerially applied spray within a riparian management area. SAF 2010 National Convention, Albuquerue, NM, U.S.A., 27-31 October 2010.

Development and testing of an aerial application standardized spray system

Hoffmann, W. C., Fritz, B. and Hewitt, A. (2010). Development and testing of an aerial application standardized spray system. 31st Symposium on Pesticide Formulations and Delivery Systems: Innovative Green Chemistries for the 21st Century, San Antonio, Texas, United States, 12-14 October 2010.

Development of a drift reduction technology deposition model based on spray characteristics from wind tunnel and field sampling

Hewitt, A. J., Hoffman, W. C., Miller, P., Fritz, B., Thistle, H., Teske, M., Dorr, G., O'Donnell, C., Bagley, W., Giles, D., Czazykz, Z., Connell, R., Birchfield, N. and Martin, D. (2010). Development of a drift reduction technology deposition model based on spray characteristics from wind tunnel and field sampling. 31st Symposium on Pesticide Formulations and Delivery Systems: Innovative Green Chemistries for the 21st Century, San Antonio, Texas, USA, 12-14 October 2010.

Drift reduction technologies in Australia and New Zealand

Hewitt, Andrew J. (2010). Drift reduction technologies in Australia and New Zealand. 239th ACS National Meeting & Exposition, San Francisco CA, United States, 21-25 March 2010.

Effects of air speed and liquid temperature on atomization of sprays under ground application conditions

Hoffmann, W. C., Fritz, B., Hewitt, A. J. and Bagley, W. (2010). Effects of air speed and liquid temperature on atomization of sprays under ground application conditions. 31st Symposium on Pesticide Formulations and Delivery Systems: Innovative Green Chemistries for the 21st Century, San Antonio, Texas, United States, 12-14 October 2010. West Conshohocken, PA, United States: ASTM International.

Field scale evaluation of spray drift reduction technologies from ground and aerial application systems

Fritz, B., Hoffmann, W. C., Birchfield, N., Ellenberger, J., Kosusko, M., Khan, F. and Hewitt, A. (2010). Field scale evaluation of spray drift reduction technologies from ground and aerial application systems. 31st Symposium on Pesticide Formulations and Delivery Systems: Innovative Green Chemistries for the 21st Century, San Antonio, Texas, USA, October 12-14 2010.

International standards for drift reduction technology studies

Hewitt, Andrew (2010). International standards for drift reduction technology studies. 2010 Joint Annual Meeting of the Society for Range Management (SRM) and Weed Society of America (WSSA), Denver, Colorado, USA, 7 - 11 February 2010.

Shelterbelt interception of agrichemicals: Model and field results

Connell, R. J., Woodward, S. J. R., Zabkiewicz, J. A. and Hewitt, A. J. (2010). Shelterbelt interception of agrichemicals: Model and field results. 2010 Meeting of the Association of Applied Biologists: International Advances in Pesticide Application, Cambridge, United Kingdom, 5-7 January 2010. Wellesbourne, Warwick, United Kingdom: Association of Applied Biologists.

Tracer and collector systems for field deposition research

Hewitt, A. J. (2010). Tracer and collector systems for field deposition research. Aspects of Applied Biology 99, Cambridge, U. K., 5-7 January 2010. Warwick, U.K.: Association of Applied Biologists.

WTDISP - Adapting a Lagrangian ground sprayer model using wind tunnel data

Connell, R. J., Hewitt, A., Wolf, T. and Miller, P. C.H. (2009). WTDISP - Adapting a Lagrangian ground sprayer model using wind tunnel data. Modelling and Simulation Society of Australia and New Zealand Inc. (MSSANZ).

Deposition of aerially applied spray to a stream within a vegetative barrier

Thistle, H. W., Ice, G. G., Karsky, R.L., Hewitt, A.J. and Dorr, G. (2009). Deposition of aerially applied spray to a stream within a vegetative barrier. 2007 ASABE Annual International Meeting, Minneapolis, MN United States, 2007. Joseph, MI United States: American Society of Agricultural and Biological Engineers. doi: 10.13031/2013.29128

Spray optimization through application and liquid physical property variables-I

Hewitt, Andrew J. (2008). Spray optimization through application and liquid physical property variables-I. doi: 10.1007/s10669-007-9044-5

Spray adjuvant effects on droplet size spectra measured by three laser-based systems in a high-speed wind tunnel

Clint Hoffmann, W., Hewitt, A. J., Ross, J. B., Bagley, W. E., Martin, D. E. and Fritz, B. K. (2008). Spray adjuvant effects on droplet size spectra measured by three laser-based systems in a high-speed wind tunnel. Pesticide Formulations and Delivery Systems: Reassessing Pesticide Technologies, Dallas, TX, 17 - 20 October 2005. West Conshohocken, PA United States: ASTM International.

Development of a Decision-Making Tool to Minimize Environmental and Public Health Risk of Pesticide Application

Dorr, G., Noller, B. N., Woods, N., Hewitt, A. J., Hanan, J. S., Adkins, S. W. and Ricci, P. F. (2007). Development of a Decision-Making Tool to Minimize Environmental and Public Health Risk of Pesticide Application. International Chemical Congress of Pacific Basin Societies (PACIFICHEM 2005), Honolulu, HI, 15-20 Dec 2005. Washington, D.C.: American Chemical Society. doi: 10.1021/bk-2007-0966.ch004

Modeling the Interaction of Plant Architecture and Spray Techniques

Dorr, Gary J., Hanan, Jim, Hewitt, Andrew J., Adkins, Steve and Noller, Barry N. (2007). Modeling the Interaction of Plant Architecture and Spray Techniques. 2007 ASABE Annual International Meeting, Minneapolis, Minnesota, 17-20 June, 2007. St. Joseph, Michigan: American Society of Agricultural and Biological Engineers.

Optimisation of herbicide deposition and retention using computer modeling validated through wind tunnel studies

Dorr, S., Adkins, S., Hanan, J., O'Donnell, C., Hewitt, A. and Noller, B. (2007). Optimisation of herbicide deposition and retention using computer modeling validated through wind tunnel studies. 21st Asian Pacific Weed Science Society (APWSS) Conference, Colombo, Sri Lanka, 2-6 October 2007. Colombo, Sri Lanka: University of Peradeniya and Chemical Industries.

A decision-making tool to minimise environmental and public health risk of pesticide application

Dorr, G. J., Noller, B N, Hewitt, A J, Hanan, J S and Adkins, S W (2006). A decision-making tool to minimise environmental and public health risk of pesticide application. 6th Annual Health and Medical Research conference of Queensland, Hilton Hotel, Brisbane, 23-24 November 2006. Brisbane, QLD: Queensland Government.

Applicability of a controlled environment facililty for Aerosol Toxicological Exposure Assessments

Noller, B. N., Hewitt, A. J., Woods, N., Dorr, G. J. and Kleinmeulman, P. A. (2005). Applicability of a controlled environment facililty for Aerosol Toxicological Exposure Assessments. Downunder Intern. Conf. on the Removal or Destruction of Highly Toxic Chemical & Biol. Contamination, Melbourne, Vic, 13-16 February 2005. Canberra, Australia: Department of Defense.

Development of a decision-making tool to minimise environmental and public health risk of pesticide application

Dorr, G. J., Noller, B., Hanan, J., Adkins, Stephen W., Woods, N., Hewitt, A. and Ricci, P. (2005). Development of a decision-making tool to minimise environmental and public health risk of pesticide application. 2005 International Chemical Congress of Pacific Basin, Honolulu, Hawaii, USA, 15-20 December, 2005.

Modelling Chemical Exposure to Aquatic Ecosystems

Hewitt, A. J., Woods, N., O'Donnell, C. C., Dorr, G. J., Gardner, A. D. and Noller, B. N. (2005). Modelling Chemical Exposure to Aquatic Ecosystems. Australian Coral Reef Society Conference, Heron Island, 20-22 August 2005. Gatton: Centre for Pesticide Application and Safety.

Predicted deposition variability due to fluctuatioins in release height and drop size distribution

Teske, Milton E., Thistle, Harold W., Reardon, Richard C., Cormier, Gerry, Amirault, Peter, Davies, David C., Cameron, R. S., Dorr, Gary, Hewitt, Andrew J., Brown, James R., Le Clerc, Monique Y. and Karipot, Anandakumar (2005). Predicted deposition variability due to fluctuatioins in release height and drop size distribution. ASTM International.

Comparing droplet size and velocity of different hydraulic nozzle spray plumes

Kleinmeulman, P. A., Dorr, G. J., Woods, N., Hewitt, A. J., Noller, B. N., Hanan, J. S. and Adkins, S. W. (2004). Comparing droplet size and velocity of different hydraulic nozzle spray plumes. Intern'l Conf on Pesticide Application for Drift Management, Hawaii/Hilton Waikoloa Village, 27-29 October 2004. Pullman, Washington: Washington State Unviersity Extension.

Comparison of three imaging systems for water-sensitive papers

Hoffmann, W. C. and Hewitt, A. J. (2004). Comparison of three imaging systems for water-sensitive papers. ASAE Annual International Meeting 2004, Ottawa, Canada, 1-4 August 2004. St Joseph, MI, USA: ASAE.

Modelling wind tunnel drift measurements

Dorr, G. J., Woods, N., Hewitt, A. J., Hanan, J. S., Kleinmeulman, P. A. and Adkins, S. W. (2004). Modelling wind tunnel drift measurements. Intern'l Conf on Pesticide Application for Drift Management, Hawaii/Hilton Waikoloa Village, 27-29 October 2004. Pullman, Washington: Washington State University Extension.

Suggested revisions to ASAE standard S572 Aug99

Teske, Milton E., Hewitt, Andrew J. and Valcore, David L. (2004). Suggested revisions to ASAE standard S572 Aug99. ASAE Annual International Meeting 2004, Ottawa, Canada, 1-4 August 2004. St Joseph, MI, USA: ASAE.

Wind tunnels, lasers and mosquitoes - Applications for control studies

Boyd, A., Hewitt, A. J., Dorr, G. J., Kleinmeulmann, P. and Noller, B. N. (2004). Wind tunnels, lasers and mosquitoes - Applications for control studies. 4th Annual Queensland Health and Medical Scientific Meeting, Brisbane, 30 Nov - 1 Dec 2004. Brisbane: Queensland Health.

Characterizing granular material in aerial application

Teske, Milton E., Hewitt, Andrew J. and Ice, George G. (2003). Characterizing granular material in aerial application. American Society for Testing and Materials.

Adjuvant effects on spray characteristics and drift potential

Miller, Paul C. H., Hewitt, A. J. and Bagley, W. E. (2001). Adjuvant effects on spray characteristics and drift potential. American Society for Testing and Materials. doi: 10.1520/stp10727s

Droplet size spectra from rotary atomizers and hydraulic nozzles in mosquito control

Hewitt, A.J., Zany, W., Dorr, G. J. and Woods, N. (2001). Droplet size spectra from rotary atomizers and hydraulic nozzles in mosquito control. Dearborn, MI, USA, May 2001. Irvine, CA, USA: ILASS Americas (Institute of Liquid Atomization and Spray Systems, North & South America).

Real time spray drift prediction

Maber, J., Dewar, P., Praat, J. P. and Hewitt, A. J. (2001). Real time spray drift prediction. International Society for Horticultural Science. doi: 10.17660/ActaHortic.2001.566.64

The measurement of droplet size distributions from rotary atomizers

Teske, Milton E., Hewitt, Andrew J. and Mickle, Robert E. (2001). The measurement of droplet size distributions from rotary atomizers. American Society for Testing and Materials. doi: 10.1520/stp10729s

A review of ground sprayer data and a preliminary analytical model

Teske, Milton E., Valcore, David L. and Hewitt, Andrew J. (2000). A review of ground sprayer data and a preliminary analytical model.

Methodologies for the Quantification of Spray Deposition and Drift in Field Applications

Hewitt, A. J. (2000). Methodologies for the Quantification of Spray Deposition and Drift in Field Applications.

The need for nozzle emission spectra in drift mitigation

Teske, Milton E., Hewitt, Andrew J., Esterly, David M. and Valcore, David L. (2000). The need for nozzle emission spectra in drift mitigation.

Drift control polymers and formulation type affect volumetric droplet size spectra of propanil sprays

Apodaca, M. A., Sanderson, R., Huddleston, E. W., Clason, D. L., Hewitt, A. J., Ledson, T. M., Ross, J. B. and Ortiz, M. (1996). Drift control polymers and formulation type affect volumetric droplet size spectra of propanil sprays. Taylor and Francis Inc.. doi: 10.1080/03601239609373041

Droplet size spectra of DipelTM sprayed through different atomizers

Sanderson, Robert, Hewitt, Andrew J., Huddleston, Ellis W., Devisetty, Bala N., Melchoir, Gary L. and Ross, James B. (1993). Droplet size spectra of DipelTM sprayed through different atomizers. Publ by ASTM.