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See detailStrategy to control the effectiveness of microwave treatment of wood in the framework of the implementation of ISPM 15
Henin, Jean-Marc; Charron, Stéphane; Luypaert, Peter et al

in Forest Products Journal (2008), 58(12), 75-81

Wood packaging materials (WPM) are known to be important potential vectors of exotic organisms, some of which turn into major ecological or socio-economic problems in regions where they are introduced. At ... [more ▼]

Wood packaging materials (WPM) are known to be important potential vectors of exotic organisms, some of which turn into major ecological or socio-economic problems in regions where they are introduced. At present, the heating and methyl bromide fumigation of WPM are the only sanitary treatments approved under ISPM15 (FAO 2002). Since both methods present noticeable disadvantages, the use of microwaves for the disinfestation of WPM is a very attractive alternative. Therefore, pallet components (22 mm-thick pine planks) artificially infested with larvae of Hylotrupes bajulus (Col., Cerambycidae) were treated in a continuous conveying tunnel design of 4 kW microwave oven. Posttreatment surface and inside emperatures of the planks were strongly correlated. As expected from the literature, all larvae exposed to inside plank temperatures exceeding 55 °C died. Surface temperatures higher than 60 °C guaranteed these lethal conditions inside the wood, whatever its moisture content. Those <br />observations thus suggest that treatment effectiveness could be controlled through the measurement of the planks’ surfacetemperatures. Although further experiments are needed, irradiation of 22 mm-thick pine planks in a continuously supplied 28.8 kW microwave oven confirmed the appeal of this monitoring strategy. If successful treatment control is demonstrated whatever the characteristics of the planks (thickness, basic density, species, MC, . . . ), the proposed monitoring strategy, which can be integrated in an assembly line provided with a tunnel oven, can be a significant step towards the recognition of microwave <br />irradiation as an acceptable treatment for eradication of pests and pathogens in WPM. [less ▲]

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