Heat Treatments for Killing Apple Maggot Fly (Diptera : Tephritidae) Puparia for Application in Disinfesting Organic Yard Waste
Published by Oxford University Press on behalf of Entomological Society of America 2022..
Organic yard waste from western Washington, U.S. that may contain puparia of apple maggot fly, Rhagoletis pomonella (Walsh) (Diptera: Tephritidae), had been moved to central Washington for composting, threatening the $3 billion apple industry concentrated in that region. Heating waste to kill fly puparia before it is transported could be a solution to this problem. Here, we report results of studies in 2016-2021 that sought to identify a minimum heat treatment simulating that obtained using a low-pressure steam generator for maximizing kill of R. pomonella puparia. In two experiments, puparia were exposed to temperatures ramped linearly over 6 h from 21°C to 47.8, 51.1, 55.0, or 60.0°C in an oven. The 47.8, 51.1, and 55°C treatments did not achieve 100% mortality, although only one adult fly from 4,000 puparia was found in the 55°C treatment, while no puparia survived the 60°C treatment. In a third, similar experiment, no puparia out of 2,400 exposed to 55°C survived. In a fourth and final experiment conducted over 3 years, no puparia out of 61,223 exposed to a 6-h ramp from 21°C to 55°C followed by a 1-h hold time at 55°C produced flies. In addition, all puparia in this treatment died. Based on 42.3 to 69.8% control survival, 31,217 puparia were killed by this treatment with no survivors, for a probit 8.7190 level of security. Results suggest that the 55°C and 1-h hold time treatment here is close to the minimum heat regime needed for disinfesting organic waste of R. pomonella puparia.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2022 |
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| Erschienen: |
2022 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:115 |
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| Enthalten in: |
Journal of economic entomology - 115(2022), 2 vom: 13. Apr., Seite 493-500 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Yee, Wee L [VerfasserIn] |
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| Links: |
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| Themen: |
Compost |
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| Anmerkungen: |
Date Completed 15.04.2022 Date Revised 10.05.2022 published: Print Citation Status MEDLINE |
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| doi: |
10.1093/jee/toab269 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| 520 | |a Organic yard waste from western Washington, U.S. that may contain puparia of apple maggot fly, Rhagoletis pomonella (Walsh) (Diptera: Tephritidae), had been moved to central Washington for composting, threatening the $3 billion apple industry concentrated in that region. Heating waste to kill fly puparia before it is transported could be a solution to this problem. Here, we report results of studies in 2016-2021 that sought to identify a minimum heat treatment simulating that obtained using a low-pressure steam generator for maximizing kill of R. pomonella puparia. In two experiments, puparia were exposed to temperatures ramped linearly over 6 h from 21°C to 47.8, 51.1, 55.0, or 60.0°C in an oven. The 47.8, 51.1, and 55°C treatments did not achieve 100% mortality, although only one adult fly from 4,000 puparia was found in the 55°C treatment, while no puparia survived the 60°C treatment. In a third, similar experiment, no puparia out of 2,400 exposed to 55°C survived. In a fourth and final experiment conducted over 3 years, no puparia out of 61,223 exposed to a 6-h ramp from 21°C to 55°C followed by a 1-h hold time at 55°C produced flies. In addition, all puparia in this treatment died. Based on 42.3 to 69.8% control survival, 31,217 puparia were killed by this treatment with no survivors, for a probit 8.7190 level of security. Results suggest that the 55°C and 1-h hold time treatment here is close to the minimum heat regime needed for disinfesting organic waste of R. pomonella puparia | ||
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