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Phytosanitary treatment of European pallets by microwave: developing a program to ensure compliance with ISPM 15 and monitoring its efficacy on the house longhorn beetle (Hylotrupes bajulus L.)

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Abstract

Microwave heating was recently approved by the FAO as a significantly effective phytosanitary treatment for wood packaging material. According to ISPM 15 (FAO 2009), the target organisms are eradicated if a temperature higher than 60 °C is maintained for 60 s across the entire profile of the board (i.e. 60 °C/60 s). A study using pallet boards was carried out in order to set up a treatment program that would meet ISPM 15 requirements in terms of wood temperature and insect mortality. A 4 m-long industrial tunnel oven (maximum power of 28.8 kW) was used to carry out the experiments. Temperature was measured by means of a VarioCAM® infrared camera. The most relevant results found were: (i) achieving a mean temperature of 63.2 °C (Populus sp.) or 64.8 °C (Pinus sylvestris L.) on the upper surface of 22 mm-thick boards enabled compliance with FAO requirements (i.e. 60 °C/60 s), whatever the moisture content, basic density and initial temperature of the wood (provided the latter exceeded 0 °C); (ii) larvae >150 mg represented the most microwave-resistant life stage of Hylotrupes bajulus L.; (iii) the mortality rate of the larvae was influenced by the moisture content of the boards. Using the Gompertz model, the upper surface temperature was estimated that would be needed to achieve a 99.99683 % mortality rate (the Probit 9 mortality level of efficacy) for the most microwave-resistant life stage of H. bajulus. This temperature was estimated to be 46.8 and 57 °C for wood with >50 and <25 % moisture content, respectively.

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Authors and Affiliations

  1. Laboratory of Wood Technology, Public Service of Wallonia (PSW), 23, Avenue Maréchal Juin, B-5030, Gembloux, Belgium

    Jean-Marc Henin & Benoit Jourez

  2. Department of Forest and Nature Management, Gembloux Agro-Bio Tech, University of Liège (ULg), 2, Passage des Déportés, B-5030, Gembloux, Belgium

    Michael Leyman, Aline Bauduin & Jacques Hébert

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  1. Jean-Marc Henin
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  2. Michael Leyman
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  3. Aline Bauduin
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  4. Benoit Jourez
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  5. Jacques Hébert
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Correspondence to Jacques Hébert.

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Henin, JM., Leyman, M., Bauduin, A. et al. Phytosanitary treatment of European pallets by microwave: developing a program to ensure compliance with ISPM 15 and monitoring its efficacy on the house longhorn beetle (Hylotrupes bajulus L.). Eur. J. Wood Prod. 72, 623–633 (2014). https://doi.org/10.1007/s00107-014-0826-4

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