Publications (Clicking on the reprint icon will take you to the publication reprint.)

Evaluating airborne hyperspectral imagery for mapping saltcedar infestations in west Texas - (Peer Reviewed Journal)

(26-Apr-13)

Agricultural aviation application in the USA - (Peer Reviewed Journal)

(31-Mar-13)

Blackmargined aphid (Monellia caryella (Fitch); Hemiptera: Aphididae) honeydew production in pecan (Carya illinoinesis (Koch)) and implications for managing the pecan aphid complex in Texas - (Peer Reviewed Journal)

(28-Jan-13)

Using airborne imagery to monitor cotton root rot progression in fungicide-treated and untreated cotton fields. - (Proceedings)

(18-Jan-13)

Effects of image spatial and radiometric resolutions on the detection of cotton plants - (Proceedings)

(18-Jan-13)

Precision agricultural systems - (Book / Chapter)

(30-Nov-12)

Measurement and classification methods using the ASAE S572-1 reference nozzles - (Peer Reviewed Journal)

Fritz, B.K., Hoffmann, W.C., Czaczyk, Z., Bagley, W., Kruger, G., Henry, R. 2012. Measurement and classification methods using the ASAE S572-1 reference nozzles. Journal of Plant Protection Research. 52:447-457.

A method for fast selecting feature wavelengths from the spectral information of crop nitrogen - (Peer Reviewed Journal)

(12-Oct-12)

Correction of spray concentration and bioassay cage penetration data - (Peer Reviewed Journal)

Fritz, B.K., Hoffmann, W.C., Bonds, J., Haas, K. 2012. Correction of spray concentration and bioassay cage penetration data. American Mosquito Control Association. 28(40):320-322.

Broaden Engineering Technology students' knowledge through hands-on with motion robotics - (Proceedings)

Wang, Y., Lan, Y., Lian, J., Cui, S. 2012. Broaden Engineering Technology students' knowledge through hands-on with motion robotics. Proceedings of ASEE AC. 2012-5398.

Airspeed and orifice size affect spray droplet spectrum from an aerial electrostatic nozzle for fixed-wing applications - (Peer Reviewed Journal)

(07-Sep-12)

Development of an unmanned agricultural robotics system for measuring crop conditions for precision aerial application - (Abstract Only)

Lan, Y., Zheng, Y., Wang, Y., Hoffmann, W.C. 2012. Development of an unmanned agricultural robotics system for measuring crop conditions for precision aerial application. ASABE Annual International Meeting. Paper No. 121338444.

Multi-objective optimization of crop planting structure in irrigation area based on remote sensing technology - (Abstract Only)

Zhang, C., Zhang, Z., Chen, J., Lan, Y. 2012. Multi-objective optimization of crop planting structure in irrigation area based on remote sensing technology. ASABE Annual International Meeting. Paper No. 121341201.

Combine harvester monitor system based on wireless sensor network - (Abstract Only)

Yin, Y., Zheng, Y., Zhang, C., Tan, Y., Lan, Y., Wang, S. 2012. Combine harvester monitor system based on wireless sensor network. ASABE Annual International Meeting. Paper No. 121341224.

Communication protocol in chassis detecting wireless transmission system based on WiFi - (Abstract Only)

He, J., Zheng, Y., Zhang, C., Tan, Y., Lan, Y., Wang, S. 2012. Communication protocol in chassis detecting wireless transmission system based on WiFi. ASABE Annual International Meeting. Paper No. 121341223.

Detection system for concentration quantization of colloidal-gold test strips based on embedded and image technology - (Abstract Only)

Zheng, Y., Kong, F., Jiang, H., Wang, H., Lan, Y., Tan, Y. 2012. Detection system for concentration quantization of colloidal-gold test strips based on embedded and image technology. ASABE Annual International Meeting. Paper No. 121341221.

An ontology-based collaborative service framework for agricultural information - (Abstract Only)

Zheng, Y., Yang, S., Chen, Y., Lan, Y., Li, D., Tan, Y. 2012. An ontology-based collaborative service framework for agricultural information. ASABE Annual International Meeting. Paper No. 121341225.

Ultra-low altitude and low spraying technology research with UAV in paddy - (Abstract Only)

Xue, X., Qin, W., Lan, Y. 2012. Ultra-low altitude and low spraying technology research with UAV in paddy. International Conference on Precision Agriculture Abstracts & Proceedings. CD-ROM.

Determination of selection criteria for spray drift reduction from atomization data - (Peer Reviewed Journal)

Hoffmann, W.C., Fritz, B.K., Bagley, W., Gednalske, J., Elsik, C., Kruger, G. 2012. Determination of selection criteria for spray drift reduction from atomization data. Journal of ASTM International. DOI:10.1520/STP104454.

Effect of formulated glyphosate and adjuvant tank mixes on atomization from aerial application flat fan nozzles - (Peer Reviewed Journal)

Fritz, B.K., Hoffmann, W.C., Bagley, W.E. 2012. Effect of formulated glyphosate and adjuvant tank mixes on atomization from aerial application flat fan nozzles. Journal of ASTM International. doi 10.1520/STP104451.

Differentiation of cotton from other crops at different growth stages using spectral properties and discriminant analysis - (Peer Reviewed Journal)

Zhang, H., Lan, Y., Suh, C.P., Westbrook, J.K., Lacey, R., Hoffmann, W.C. 2012. Spectral properties of crops at different growth stages. Transactions of the ASABE. 55:1-8.

Wind tunnel and field evaluation of drift from aerial spray applications with multiple spray formulations - (Peer Reviewed Journal)

Fritz, B.K., Hoffmann, W.C., Bretthauer, S., Wolf, R.E., Bagley, W.E. 2012. Wind tunnel and field evaluation of drift from aerial spray applications with multiple spray formulations. Journal of ASTM International. doi 10-1520/STP104403.

Further evaluation of spray characterization of sprayers typically used in vector control - (Peer Reviewed Journal)

Hoffmann, W.C., Walker, T.W., Fritz, B.K., Farooq, M., Smith, V.L., Robinson, C.A., Lan, Y. 2012. Further evaluation of spray characterization of sprayers typically used in vector control. Journal of the American Mosquito Control Association. 28(2):93-101.

Precision aerial application for site-specific rice crop management - (Abstract Only)

Lan, Y., Hoffmann, W.C. 2012. Precision aerial application for site-specific rice crop management. Rice Technical Working Group Meeting Proceedings. CD-ROM.

Fusion of remotely sensed data from airborne and ground-based sensors for cotton regrowth study - (Proceedings)

Lan, Y., Zhang, H., Suh, C.P., Westbrook, J.K., Hoffmann, W.C., Yang, C., Huang, Y. 2011. Fusion of remotely sensed data from airborne and ground-based sensors for cotton regrowth study. ASA-CSSA-SSSA Proceedings. CD-ROM.

Effect of Hexaflumuron on feeding response and reproduction of bollworm, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae) - (Peer Reviewed Journal)

Lopez, J., Latheef, M.A., Hoffmann, W.C. 2011. Effect of Hexaflumuron on feeding response and reproduction of bollworm, Helicoverpa zea (Boddie) (Lepidoptera: Noctuidae). Southwestern Entomologist. 36(3):247-259.

Expansion of the USDA ARS Aerial Application spray atomization models - (Proceedings)

Fritz, B.K., Hoffmann, W.C., Martin, D.E., Lan, Y. 2011. Expansion of the USDA ARS Aerial Application spray atomization models. Proceedings Annual Conference on Liquid Atomization and Spray Systems. Estoril, Portugal, September 5-7, 2011. p. 1-7.

Effect of abamectin on feeding response, mortality, and reproduction of adult bollworm (Lepidoptera: Noctuidae) - (Peer Reviewed Journal)

Lopez, J., Latheef, M.A., Hoffmann, W.C. 2011. Effect of abamectin on feeding response, mortality, and reproduction of adult bollworm (Lepidoptera: Noctuidae). Southwestern Entomologist. 36:155-166.

Genetic differentiation across North America in Heliothis virescens and H. subflexa: A generalist versus a specialist moth - (Peer Reviewed Journal)

Groot, A., Classen, A., Inglis, O., Blanco, C., Lopez, J., Teran Vargas, A., Schal, C., Heckel, D., Schoefl, G. 2011. Genetic differentiation across North America in Heliothis virescens and H. subflexa: A generalist versus a specialist moth. Molecular Ecology. 20(13):2676-2692.

Field scale evaluation of spray drift reduction technologies from ground and aerial application systems - (Peer Reviewed Journal)

Fritz, B.K., Hoffmann, W.C., Bagley, W.E., Hewitt, A. 2011. Field scale evaluation of spray drift reduction technologies from ground and aerial application systems. Journal of ASTM International. 8(5):JAI103457.

Air and spray mixture temperature effects on atomization of agricultural sprays - (Peer Reviewed Journal)

Hoffmann, W.C., Fritz, B.K., Martin, D.E. 2011. Air and spray mixture temperature effects on atomization of agricultural sprays. Agricultural Engineering International: CIGR Journal. 13(1):Manuscript 1730.

Effects of air speed and liquid temperature on droplet size - (Peer Reviewed Journal)

Hoffmann, W.C., Fritz, B.K., Bagley, W.E., Lan, Y. 2011. Effects of air speed and liquid temperature on droplet size. Journal of ASTM International. 8(4):JAI103461.

A fluorescent tracer method for evaluating spray transport and fate of field and laboratory spray applications - (Peer Reviewed Journal)

Fritz, B.K., Hoffmann, W.C., Jank, P.C. 2011. A fluorescent tracer method for evaluating spray transport and fate of field and laboratory spray applications. Journal of ASTM International. 8(3):JAI103619.

Influence of moisture content and temperature on thermal conductivity and thermal diffusivity of rice flours - (Peer Reviewed Journal)

Mahapatra, A.K., Lan, Y., Harris, D.L. 2011. Influence of moisture content and temperature on thermal conductivity and thermal diffusivity of rice flours. International Journal of Food Properties. 14:675-683.

Update on monitoring of resistance to Bt cotton in key lepidopteran pests in the USA - (Proceedings)

Dennehy, T.J., Carroll, M., Greenplate, J.T., Head, G.P., Moar, W., Price, P.A., Akbar, W., Akin, D.S., Bradley, J.R., Cook, D.R., Greene, J.K., Kerns, D., Leonard, B.R., Lopez, J., Roberts, P., Smith, R., Vanduyn, J., Unnithan, G.C. 2011. Update on monitoring of resistance to Bt cotton in key lepidopteran pests in the USA. Proceedings of the Beltwide Cotton Conferences. Paper 11502.

Spatial analysis of NDVI readings with difference sampling density - (Peer Reviewed Journal)

Zhang, H., Lan, Y., Lacey, R., Hoffmann, W.C., Westbrook, J.K. 2011. Spatial analysis of NDVI readings with difference sampling density. Transactions of the ASABE. 54:349-354.

Volumetric Collection Efficiency and Droplet Sizing Accuracy of Rotary Impactors - (Peer Reviewed Journal)

Fritz, B.K., Hoffmann, W.C., Bonds, J.A., Farooq, M. 2011. Volumetric collection efficiency and droplet sizing accuracy of rotary impactors. Transactions of the ASABE. 54:57-63.

Impact of electrostatic and conventional sprayers characteristics on dispersion of barrier spray - (Peer Reviewed Journal)

Farooq, M., Walker, T.W., Heintschel, B.P., Hoffmann, W.C., Fritz, B.K., Smith, V.L., Robinson, C.A., English, T. 2010. Impact of electrostatic and conventional sprayers characteristics on dispersion of barrier spray. Journal of the American Mosquito Control Association. 26:422-429.

Mortality and reproductive effects of ingested spinosad on adult bollworm - (Peer Reviewed Journal)

Lopez, J., Latheef, M.A., Hoffmann, W.C. 2011. Mortality and reproductive effects of ingested spinosad on adult bollworm. Pest Management Science. 67:220-225.

Filtration effects due to bioassay cage design and screen type - (Peer Reviewed Journal)

Fritz, B.K., Hoffmann, W.C., Farooq, M., Walker, T., Bonds, J. 2010. Filtration effects due to bioassay cage design and screen type. Journal of the American Mosquito Control Association. 26:411-421.

Development of a distribution system for measuring nozzle integrative parameters - (Peer Reviewed Journal)

Xue, X., Liang, J., Liu, P., Lan, Y. 2010. Development of a distribution system for measuring nozzle integrative parameters. Advances in Hydro-Science and Engineering. 3:133-138.

Rapid detection of E. coli on goat meat by electronic nose - (Peer Reviewed Journal)

Ding, N., Lan, Y., Zheng, X. 2010. Rapid detection of E. coli on goat meat by electronic nose. Advances in Natural Science. 3:185-191.

Development of a PWM precision spraying controller for unmanned aerial vehicles - (Peer Reviewed Journal)

Zhu, H., Lan, Y., Wu, W., Hoffmann, W.C., Huang, Y., Xue, X., Liang, J., Fritz, B.K. 2010. Development of a PWM precision spraying controller for unmanned aerial vehicles. Journal of Bionics. 7:276-283.

Variation in sexual communication of the tobacco budworm, Heliothis virescens - (Peer Reviewed Journal)

Groot, A.T., Blanco, C.A., Classen, A., Inglis, O., Santangelo, R.G., Lopez, J., Heckel, D.G., Schal, C. 2010. Variation in sexual communication of the tobacco budworm, Heliothis virescens. Southwestern Entomologist. 35:367-372.

Spray drift reduction evaluations of spray nozzles using a standardized testing protocol - (Peer Reviewed Journal)

Hoffmann, W.C., Fritz, B.K., Thornburg, J.W., Bagley, W.E., Birchfield, N.B., Ellenberger, J. 2010. Spray drift reduction evaluations of spray nozzles using a standardized testing protocol. Journal of ASTM International. 7(6):JAI102820.

Multisensor data fusion of remotely sensed imagery for crop field mapping - (Proceedings)

Lan, Y., Zhang, H., Yang, C., Zhao, K., Huang, Y., Hoffmann, W.C., Lacey, R. 2010. Multisensor data fusion of remotely sensed imagery for crop field mapping. International Conference on Precision Agriculture Abstracts & Proceedings. CDROM.

Current status and future directions of precision aerial application for site-specific crop management in the USA - (Peer Reviewed Journal)

Lan, Y., Thomson, S.J., Huang, Y., Hoffmann, W.C., Zhang, H. 2010. Current status and future directions of precision aerial application for site-specific crop management in the USA. Computers and Electronics in Agriculture. 74:34-38.

Spectral properties of crops at different growth stages - (Proceedings)

Zhang, H., Lan, Y., Suh, C.P., Westbrook, J.K., Lacey, R., Hoffmann, W.C. 2010. Spectral properties of crops at different growth stages. ASABE Annual International Meeting. Paper No. 10-9038.

Simulating and characterizing agricultural ground applications for soil VOC deposition studies - (Peer Reviewed Journal)

Fritz, B.K., Hoffmann, W.C., Rohde, A., Warren, C., Faulkner, W. 2010. Simulating and characterizing agricultural ground applications for soil VOC deposition studies. Journal of ASTM International. 7(7):Paper ID JAI102776.

Ground-based spectral reflectance measurements for evaluating the efficacy of aerially-applied glyphosate treatments - (Peer Reviewed Journal)

Zhang, H., Lan, Y., Lacey, R., Hoffmann, W.C., Martin, D.E., Fritz, B.K., Lopez, J. 2010. Ground-based spectral reflectance measurements for evaluating the efficacy of aerially-applied glyphosate treatments. Biosystems Engineering. 107:10-15.

Evaluation of spray drift using low speed wind tunnel measurements and dispersion modeling - (Peer Reviewed Journal)

Fritz, B.K., Hoffmann, W.C., Birchfield, N., Ellenberger, J., Kahn, F., Bagley, W.E., Thornburg, J.W., Hewitt, A. 2010. Evaluation of spray drift using low speed wind tunnel measurements and dispersion modeling. Journal of ASTM International. 7(6):JAI102775.

Evaluation of low-volume sprayers used in asian citrus Psyllid control applications - (Peer Reviewed Journal)

Hoffmann, W.C., Fritz, B.K., Martin, D.E., Atwood, R., Hurner, T., Ledebuhr, M., Tandy, M., Jackson, J., Wisler, G.C. 2010. Evaluation of low-volume sprayers used in asian citrus Psyllid control applications. HortTechnology. 20:632-639.

Quantifying the movement of multiple insects using an optical insect counter - (Peer Reviewed Journal)

Hoffmann, W.C., Jank, P.C., Klun, J.A., Fritz, B.K. 2010. Quantifying the movement of multiple insects using an optical insect counter. Journal of the American Mosquito Control Association. 26:167-171.

"Who ate our corn?" We want to know and so should you! - (Book / Chapter)

Wilson, C.T., Lopez, J., Scott, T.P. 2010. "Who ate our corn?" We want to know and so should you! In: Yager, R. E. Exemplary Science for Resolving Societal Challenges. Arlington, VA. National Science Teachers Association. pp. 51-68.

Toxicity of selected insecticides and insecticide mixtures to adult brown stink bug (Heteroptera: Pentatomidae) - (Proceedings)

Lopez, J., Latheef, M.A., Ree, B. 2010. Toxicity of selected insecticides and insecticide mixtures to adult brown stink bug (Heteroptera: Pentatomidae). National Cotton Council Beltwide Cotton Conference. p. 985-990.

Low-volume sprayer rodeos - (Popular Publication)

Hoffmann, W.C., Fritz, B.K., Martin, D.E. 2009. Low-volume sprayer rodeos. Florida Grower. p. 12-13.

Ground-based spectral reflectance measurements for efficacy evaluation of aerially applied glyphosate treatments - (Proceedings)

Zhang, H., Lan, Y., Lacey, R., Hoffmann, W.C., Martin, D.E., Fritz, B.K., Lopez, J. 2009. Ground-based spectral reflectance measurements for efficacy evaluation of aerially applied glyphosate treatments. National Agricultural Aviation Association Meeting. Paper No. AA09-004.

An overview of spray drift reduction testing of spray nozzles - (Proceedings)

Fritz, B.K., Hoffmann, W.C., Thornburg, J.W., Bagley, W.E., Birchfield, N., Ellenberger, J. 2009. An overview of spray drift reduction testing of spray nozzles. National Agricultural Aviation Association Meeting. Paper No. AA09-002.

Analysis of variograms with various sample sizes from a multispectral image - (Peer Reviewed Journal)

Zhang, H., Lan, Y., Lacey, R., Huang, Y., Hoffmann, W.C., Martin, D.E., Bora, G. 2009. Analysis of variograms with various sample sizes from a multispectral image. International Journal of Agricultural and Biological Engineering. 2:62-69.

Samplers for evaluation and quantification of ultra-low volume space sprays - (Peer Reviewed Journal)

Farooq, M., Hoffmann, W.C., Walker, T., Smith, V., Robinson, C., Dunford, J., Sutherland, I.W. 2009. Samplers for evaluation and quantification of ultra-low volume space sprays. Journal of the American Mosquito Control Association. 25:521-524.

Current status and future directions of precision agriculture for aerial application in the USA - (Proceedings)

Lan, Y., Thomson, S.J., Huang, Y., Hoffmann, W.C., Zhang, H. 2009. Current status and future directions of precision agriculture for aerial application in the USA. Asian Conference on Precision Agriculture. CDROM.

Aerosol sampling: Comparison of two rotating impactors for field droplet sizing and volumetric measurements - (Peer Reviewed Journal)

Barber, J., Greer, M., Fritz, B.K., Hoffmann, W.C. 2009. Aerosol sampling: Comparison of two rotating impactors for field droplet sizing and volumetric measurements. Journal of the American Mosquito Control Association. 25:474-479.

Analysis of variograms with various sample sizes from a multispectral image - (Proceedings)

Zhang, H., Lan, Y., Lacey, R., Huang, Y., Hoffmann, W.C., Martin, D.E., Bora, G. 2009. Analysis of variograms with various sample sizes from a multispectral image. Asian Conference on Precision Agriculture. CDROM.

Effects of spray mixtures on droplet size under aerial application conditions and implications on drift - (Peer Reviewed Journal)

Fritz, B.K., Bagley, B., Hoffmann, W.C. 2010. Effects of spray mixtures on droplet size under aerial application conditions and implications on drift. Applied Engineering in Agriculture. 26:21-29.

Analysis of vegetation indices derived from aerial multispectral and ground hyperspectral data - (Peer Reviewed Journal)

Zhang, H., Lan, Y., Lacey, R., Hoffmann, W.C., Huang, Y. 2009. Analysis of vegetation indices derived from aerial multispectral and ground hyperspectral data. International Journal of Agricultural and Biological Engineering. 2:1-8.

Aerial spray deposition on corn silks applied at high and low spray rates - (Peer Reviewed Journal)

Fritz, B.K., Lopez, J., Latheef, M.A., Martin, D.E., Hoffmann, W.C., Lan, Y. 2009. Aerial spray deposition on corn silks applied at high and low spray rates. International Agricultural Engineering Journal. 11:Manuscript 1360.

Spray characterization of ULV sprayers typically used in vector control - (Peer Reviewed Journal)

Hoffmann, W.C., Walker, T., Fritz, B.K., Farooq, M., Smith, V., Robinson, C., Szumlas, D., Lan, Y. 2009. Spray characterization of ULV sprayers typically used in vector control. Journal of the American Mosquito Control Association. 25:332-337.

Spatial analysis of hyperspectral vegetation index - (Proceedings)

Zhang, H., Lan, Y., Lacey, R., Hoffmann, W.C., Westbrook, J.K. 2009. Spatial analysis of hyperspectral vegetation index. ASABE Annual International Meeting. Paper No. 09-5982.

Wind-tunnel tests and modeling indicate that aerial dispersant delivery operations are highly accurate - (Book / Chapter)

Hoffmann, W.C., Nedwed, T., Coolbaugh, T., Huber, C.A., Fritz, B.K. 2009. Wind-tunnel tests and modeling indicate that aerial dispersant delivery operations are highly accurate. In: Jones, N., editor. Proceedings of the Thirty-second AMOP Technical Seminar on Environmental Contamination and Response. Ottawa, Ontario, Canada: Environment Canada. p. 365-382.

Spray table evaluation of insecticidal mortality for southern green stink bug, Nezara viridula L. (Pentatomidae: Heteroptera) on greenhouse-grown cotton - (Proceedings)

Lopez, J., Latheef, M.A. 2009. Spray table evaluation of insecticidal mortality for southern green stink bug, Nezara viridula L. (Pentatomidae: Heteroptera) on greenhouse-grown cotton. National Cotton Council Beltwide Cotton Conference. p. 820-824.

Effect of Hexaflumuron on gustation and reproduction of adult boll weevil - (Peer Reviewed Journal)

Lopez, J., Latheef, M.A., Hoffmann, W.C. 2009. Effect of hexaflumuron on gustation and reproduction of adult boll weevil. Southwestern Entomologist. 34:31-41.

Spray characteristics affected by physical properties of adjuvants - (Proceedings)

Lan, Y., Fritz, B.K., Hoffmann, W.C., Bagley, W.E., Huang, Y., Martin, D.E., Lopez, J. 2008. Spray characteristics affected by physical properties of adjuvants. National Agricultural Aviation Association Meeting. Paper No. AA-08-005.

Deposition of insecticides on corn silks applied at high and low spray rates for control of corn earworm - (Proceedings)

Fritz, B.K., Lopez, J., Latheef, M.A., Martin, D.E., Hoffmann, W.C., Lan, Y. 2008. Deposition of insecticides on corn silks applied at high and low spray rates for control of corn earworm. National Agricultural Aviation Association Meeting. Paper No. AA08-004.

Spray spectrum modifications through changes in airspeed to minimize drift - (Proceedings)

Fritz, B.K., Bagley, B., Hoffmann, W.C., Lan, Y. 2009. Spray spectrum modifications through changes in airspeed to minimize drift. National Agricultural Aviation Association Meeting. Paper No. AA08-002.