Progress 10/01/04 to 08/31/08
Outputs
Progress Report Objectives (from AD-416) Develop thermal tolerance data for tropical fruits for correlating to fruit fly egg and larval heat mortality kinetics in order to define radio frequency energy heating parameters that will differentially heat the target insect to kill the insect without damaging the fruit; then to develop quarantine treatment parameters for exporting tropical fruits from Hawaii to U.S. mainland and foreign markets. Approach (from AD-416) Avocado, banana, carambola, litchi, longan, papaya, and other tropical fruits will be immersed in a Strayfield Model P512T 12 kW, 27.12 MHz RF batch type heating system and subjected to selected heating parameters to model the thermal effects of RF heating on fruit quality. This model will be correlated to thermal death kinetics models for Mediterranean, melon, and oriental fruit fly eggs and larvae to develop potential RF treatment parameters that will heat the eggs and larvae more quickly than the host fruit, thereby killing the insects without damaging fruit quality. If successful, confirmatory tests using infested fruits will be done to demonstrate treatment efficacy. Documents Reimbursable with WSU. Log 27215. Formerly 5320-43000-013-08R (6/2005). Significant Activities that Support Special Target Populations The goal of this research was to examine the potential of radio frequency energy for use as a postharvest heat treatment to control fruit fly pests in tropical fruit. A heating plate designed and constructed by the Food and Engineering Department of Washington State University was used to develop thermal mortality data for modeling the time and temperature combinations required to kill Mediterranean fruit fly, Malaysian fruit fly, melon fly, and oriental fruit fly eggs and larvae. The late-aged egg and third instar life stages of laboratory-reared Malaysian fruit fly, Bactrocera latifrons (Hendel); Mediterranean fruit fly, Ceratitis capitata (Wiedemann); melon fly, B. cucurbitae Coquillett; and oriental fruit fly, B. dorsalis (Hendel), (Diptera: Tephritidae), and the third instars of wild Mediterranean fruit fly were exposed to thermal treatments using the heating block system. Treatments consisted of heating the fruit fly life stages to 44, 46, 48, and 50�C and holding for different times ranging from 0 to 120 min depending on the thermal mortality response and time required to obtain 100% mortality for each species and life stage. The 0.5th order kinetic model had the best fit to the survival ratio for all the treatment temperatures and was used for the prediction of the lethal times. The thermal death time (TDT) curves showed a resistance order of Mediterranean fruit fly eggs at 50�C, and third instars at 44, 46, < eggs at 48�C, and wild third instars < the laboratory-reared third instars. Comparison between Mediterranean fruit fly third instar thermotolerance from Hawaii and Israel showed that Israeli Mediterranean fruit fly was more thermotolerant. A Strayfield radio frequency treatment unit for testing potential quarantine treatments and developing fruit quality data was acquired and shipped to Pacific Basin Agricultural Research Center, but due to a lack of space the Strayfield unit was never set up or used. The ADODR monitors progress through direct supervision of the research project and through participation in research activities.
Impacts
(N/A)
Publications
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Progress 10/01/06 to 09/30/07
Outputs
Progress Report Objectives (from AD-416) Develop thermal tolerance data for tropical fruits for correlating to fruit fly egg and larval heat mortality kinetics in order to define radio frequency energy heating parameters that will differentially heat the target insect to kill the insect without damaging the fruit; then to develop quarantine treatment parameters for exporting tropical fruits from Hawaii to U.S. mainland and foreign markets. Approach (from AD-416) Avocado, banana, carambola, litchi, longan, papaya, and other tropical fruits will be immersed in a Strayfield Model P512T 12 kW, 27.12 MHz RF batch type heating system and subjected to selected heating parameters to model the thermal effects of RF heating on fruit quality. This model will be correlated to thermal death kinetics models for Mediterranean, melon, and oriental fruit fly eggs and larvae to develop potential RF treatment parameters that will heat the eggs and larvae more quickly than the host fruit, thereby killing the insects without damaging fruit quality. If successful, confirmatory tests using infested fruits will be done to demonstrate treatment efficacy. Documents Reimbursable with WSU. Log 27215. Formerly 5320-43000-013-08R (6/2005). Significant Activities that Support Special Target Populations This report serves to document research conducted under a reimbursable agreement between USDA-ARS, U.S. Pacific Basin Agricultural Research Center and Washington State University (previously 5320-43000-013-08R). Additional details of research can be found in the report for the parent CRIS 5320-43000-014-00D, Postharvest Treatment of Tropical Commodities for Quarantine Security, Quality Maintenance, and Value Enhancement. This research investigates the use of radio frequency energy to control fruit fly pests in tropical fruit as an alternative to methyl bromide fumigation. A heating plate designed and constructed by the Food and Engineering Department of Washington State University was used to develop thermal mortality data for modeling the time and temperature combinations required to kill Mediterranean fruit fly, Malaysian fruit fly, melon fly, and oriental fruit fly eggs and larvae. The process of modeling the thermomortality data to provide parameters for potential radio frequency treatments to kill fruit fly eggs and larvae in tropical fruits with export value was initiated. A Strayfield radio frequency treatment unit for testing potential quarantine treatments and developing fruit quality data was acquired and shipped to Pacific Basin Agricultural Research Center. The lack of space to house the Strayfield unit has delayed initiation of research until the completion of construction of the new Center or acquisition of appropriate commercial space in which to accomplish the research. The ADODR monitors progress through direct supervision of the research project and through participation in research activities.
Impacts
(N/A)
Publications
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Progress 10/01/05 to 09/30/06
Outputs
Progress Report 4d Progress report. This report serves to document research conducted under a reimbursable agreement between ARS and the Washington State University. Addition details of research can be found in the report for the parent CRIS 5320- 43000-014-00D "Postharvest Treatment of Tropical Commodities for Quarantine Security, Quality Maintenance, and Value Enhancement." This research investigates the use of radio frequency energy to control fruit fly pests in tropical fruit as an alternative to methyl bromide fumigation. A heating plate designed and constructed by the Food and Engineering Department of Washington State University was used to develop thermal mortality data for modeling the time and temperature combinations required to kill Mediterranean fruit fly, Malaysian fruit fly, melon fly, and oriental fruit fly eggs and larvae. The process of modeling the thermomortality data to provide parameters for potential radio frequency treatments to kill fruit fly
eggs and larvae in tropical fruits with export value was initiated. A Strayfield radio frequency treatment unit for testing potential quarantine treatments and developing fruit quality data was acquired and shipped to Pacific Basin Agricultural Research Center. The lack of space to house the Strayfield unit has delayed initiation of research until the completion of construction of the new Center or acquisition of appropriate commercial space in which to accomplish the research.
Impacts
(N/A)
Publications
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Progress 10/01/04 to 09/30/05
Outputs
4d Progress report. This report serves to document research conducted under a reimbursable agreement between ARS and Washington State University. Additional details of research can be found in the report for the in-house associated project 5320-43000-014-00D, Postharvest Treatment of Tropical Commodities for Quarantine Security, Quality Maintenance, and Value Enhancement. This research investigates the use of radio frequency energy to control fruit fly pests in tropical fruit as an alternative to methyl bromide fumigation. A heating plate designed and constructed by the Food and Engineering Department of Washington State University was used to develop thermal mortality data for modeling the time and temperature combinations required to kill Mediterranean fruit fly, Malaysian fruit fly, melon fly, and oriental fruit fly eggs and larvae. The process of modeling the thermomortality data to provide parameters for potential radio frequency treatments to kill fruit fly
eggs and larvae in tropical fruits with export value was initiated. A Strayfield radio frequency treatment unit for testing potential quarantine treatments and developing fruit quality data was acquired and shipment to Pacific Basin Agricultural Research Center is in progress.
Impacts
(N/A)
Publications
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