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Commercial radio frequency units are used in industrial applications to rapidly heat a variety of materials. Because of the speed of the process, it may be applied to products normally considered to be heat sensitive, such as in-shell walnuts. A collaborative project, lead by Juming Tang of Washington State University, has developed a radio frequency treatment to disinfest in-shell walnuts of postharvest insect pests. A recent pilot study at a large walnut processing facility demonstrated the potential utility of the treatment. Current projects include the development of radio frequency treatments for dried pulses.
Project Home Page
Non-Chemical Postharvest Insect Control in Fruits and Nuts with Dielectric Heating
Collaborators
Juming Tang , WashingtonState University, Pullman
Shaojin Wang , WashingtonState University, Pullman
Elizabeth Mitcham, Cooperative Extension, Universityof California, Davis
James Hansen, USDA-ARS, Yakima, WA (retired)
Guy Hallman, USDA-ARS, Weslaco, TX
Jack Armstrong, USDA-ARS, Hilo, HI (retired)
Steve Drake, Wenatchee, WA (retired)
Publications
Pdf versions of publications may be downloaded by following the links. For publications with no links, copies may be obtained by email request to: judy.johnson@ars.usda.gov
Guo, W., Wang, S., Tiwari, G. Johnson, J. A., and Tang, J.Temperature and moisture dependent dielectric properties of legume flour associated with dielectric heating. LWT - Food Sci. Tech. 43: 193-201. 2010
Wang, S., Johnson, J. A., Hansen, J. D. and Tang, J. Determining thermotolerance of fifth-instar Cydia pomonella(L.) (Lepidoptera: Tortricidae) and Amyelois transitella (Walker) (Lepidoptera: Pyralidae) by three different methods. J. Stored Products Res. 45: 184-189. 2009
Wang, S., Monzon, M., Johnson, J. A., Mitcham, E. J., Tang, J. Industrial-scale radio frequency treatments for insect control in walnuts I: Heating uniformity and energy efficiency. Postharvest Bio. and Tech. 45: 240-246. 2007
Wang, S., Monzon, M., Johnson, J. A., Mitcham, E. J., Tang, J. Industrial-scale radio frequency treatments for insect control in walnuts II: Insect mortality and product quality. Postharvest Bio. and Tech. 45: 247-253. 2007
Hansen, J. D. and Johnson, J. A. Introduction. In Tang, J., Micham, E., Wang, S., and Lurie, S. (ed.) Heat Treatments for Postharvest Pest Control: Theory and Practice. CABI Publishing, Wallingford, Oxforshire, UK; Cambridge MA. pp. 1-26. 2007.
Tang, J., Wang, S., Johnson, J. A. Biology and thermal death kinetics of selected insects. In Tang, J., Micham, E., Wang, S., and Lurie, S. (ed.) Heat Treatments for Postharvest Pest Control: Theory and Practice. CABI Publishing, Wallingford, Oxforshire, UK; Cambridge MA. pp. 133-161. 2007.
Monzon, M. E., Biasi, B., Simpson, T. L., Johnson, J., Feng, X., Slaughter, D. C., Mitcham. E. J. Effect of radio frequency heating as a potential quarantine treatment on the quality of ‘Bing’ sweet cherry fruit and mortality of codling moth larvae. Postharvest Bio. and Tech. 40: 197-203. 2006.
Mitcham, E. J., Monzon, M., Johnson, J. A., Wang, S., Tang, J. Insect control and walnut quality following large-scale industrial radio frequency treatments. Ann. Intl. Res. Confr. Methyl Bromide Alternatives and Emissions Reductions. pp. 78.1-4. Orlando, Fl. Nov. 2006.
Wang, S., Tang, J., Johnson, J. A., Monzon, M., Mitcham, E. J. Industrial-scale radio frequency treatments for insect control in in-shell walnuts. Proc. Amer. Soc. Agric. Biol. Engineers Int. Paper # 066046, 10 pp. Portland, OR. July 2006.
Wang, S., Johnson, J. A., Tang, J., Yin, X. Heating condition effects on thermal resistance of fifth-instar Amyelois transitella (Walker) (Lepidoptera: Pyralidae). J. Stored Products Res. 41: 469-478. 2005.
Johnson, J. A., Valero, K. A., Wang, S., Tang, J. Thermal death kinetics of red flour beetle (Coleoptera: Tenebrionidae). J. Econ. Entomol. 97: 1868-1873. 2004.
Mitcham, E. J., Veltman, R. H., Feng, X., de Castro, E., Johnson, J. A., Simpson, T. L., Biasi, W. V., Wang, S., Tang, J. Application of radio frequency treatments to control insects in in-shell walnuts. Postharvest Bio. and Tech. 33: 93-100. 2004.
Tang, J., Wang, S., Mitcham, E., Johnson, J.A., Hansen, J.D., Hallman, G. Update on development of postharvest pest control treatments for nuts, citrus and tropical fruits using RF energy. Ann. Intl. Res. Confr. Methyl Bromide Alternatives and Emissions Reductions. pp. 75.1-4. Orlando, FL, Nov. 2004.
Wang, S., Tang, T., Johnson, J. A., Mitcham, E., Hansen, J. D., Hallman, G., Drake, S. R., Wang, Y. Dielectric properties of fruits and insect pests as related to radio frequency and microwave treatments. Biosystems Engineering 85: 201-212. 2003.
Johnson, J. A., Wang, S., and Tang, J. Thermal death kinetics of fifth-instar Plodia interpunctella (Lepidoptera: Pyralidae). J. Econ. Entomol. 96: 519-524. 2003.
Tang, J., Wang, S., Hansen, J., Johnson, J., Mitcham, E., Drake, S., Hallman. G. Postharvest control of insect pests in nuts and fruits based on radio frequency energy. Postharvest Unlimited, Leuven, Belgium, June 2002. published in Acta Horticulture 599: 175-181. 2003.
Wang, S., Tang, J., Johnson, J. A., Mitcham, E., Hansen, J. D., Cavalieri, R. P., Bower, J., Biasi, B. Process protocols based on radio frequency energy to control field and storage pests in in-shell walnuts. Postharvest Bio. and Tech. 26: 265-273. 2002.
Wang, S., Tang, J., Johnson, J. A., and Hansen, J. D. Thermal-death kinetics of fifth-instar Amyelois transitella (Walker) (Lepidoptera: Pyralidae). J. Stored Products Res. 38: 427-440. 2002.
Mitcham, E. J., Tipping, C., Simpson, T., Tang, J., Hansen, J., Wang, S., Brower, J., Biasi, B., Johnson, J. Control of arthropod pests after harvest using CA, GRAS fumigants or radio frequency heating. Proc. Int. Symp. Recent Drying & Storage Technology of Foods and Agricultural Products. pp. 14-19. Seoul, Korea. Nov. 2001
Johnson, J. A., Wang, S., and Tang, T. Thermal tolerance of navel orangeworm and Indianmeal moth. Ann. Intl. Res. Confr. Methyl Bromide Alternatives and Emissions Reductions. p. 60.1-4. San Diego, CA. Nov. 2001.
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