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Front. For. Glob. Change
Sec. Pests, Pathogens and Invasions
Volume 7 - 2024 | doi: 10.3389/ffgc.2024.1380040

Evidence to support phytosanitary policies -The minimum effective heat treatment parameters for pathogens associated with forest products Provisionally Accepted

 Meghan Noseworthy1* Eric A. Allen2 Angela L. Dale1 Isabel Leal1  Esme P. John1 Tyranna J. Souque1 Joey B. Tanney1 Adnan Uzunovic3
  • 1Natural Resources Canada, Canadian Forest Service, Canada
  • 2Other, Canada
  • 3Canada Wood Group, Canada

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Research on reducing the movement of pests on wood products has led to several options for safer trade including heat treatment of wood to mitigate pests. In this study, pathogenic organisms commonly regulated in the trade of forest products were tested to determine the minimum heat dose (temperature and time) required to cause mortality. The mycelial stage of tree pathogens, Heterobasidion occidentale, Grosmannia clavigera, Bretziella fagacearum, Phytophthora cinnamomi, P. lateralis, P. ramorum and P.xmultiformis, which may be found in wood products, were tested in vitro using the Humble water bathwith parameters simulating the rate of heat applied to wood in a commercial kiln. The lethal temperature for the pathogens ranged from 44-50 °C for a 30-minute treatment duration. A molecular diagnostic method to confirm pathogen mortality was available for five of the species heat treated. RNA detection using reverse transcription real-time PCR was used to validate pathogen mortality following treatment for: P. ramorum, P. lateralis, P. cinnamomi, P. x multiformis and G. clavigeraPathogen mortality was confirmed with RNA detection using reverse transcription real-time PCR for a subset of Phytophthora spp. and G. clavigera samples.

Keywords: Humble water bath, Forestry pests, sudden oak death, Oak wilt, Root disease, Blue stain, Phytophthora spp

Received: 31 Jan 2024; Accepted: 18 Apr 2024.

Copyright: © 2024 Noseworthy, Allen, Dale, Leal, John, Souque, Tanney and Uzunovic. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Mx. Meghan Noseworthy, Natural Resources Canada, Canadian Forest Service, Fredericton, Canada