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    Description

    Methyl bromide (MB) fumigation is required for U.S. Quercus log exports due to concern over unintentional spread of Bretziella fagacearum. MB alternatives are needed due to the chemical's ability to damage the earth's ozone layer. Vacuum steam (VS) is an environmentally-friendly method that was evaluated for its ability to eradicate B. fagacearum in logs (24 to 61 cm dia; 2.1 m long) obtained from Q. rubra that had wilted following natural infection (NI) or artificial inoculation (AI). Five replicate loads of two NI and one AI logs were VS-treated at 56°C for 30 min and 60°C for 60 min (at 5.0 cm sapwood depth). Mean frequencies of pre-treatment fungus colonization ranged from 12.5 to 24.4% in NI and 29.4 to 45.6% in AI logs based on isolation from wood chips of inner and outer sapwood, respectively, of two disks per log. Frequencies of pathogen DNA detection were similar to those for isolation. No viable pathogen or its DNA were detected in post-treatment logs. Treatment times ranged from 5 to 9 h for the 56°C/30 min schedule and 8 to 10 h for the 60°C/60 min schedule. Based on these results, VS is worthy of further development as a MB alternative.

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    Citation

    Juzwik, Jennifer; Yang, Anna; Chen, Zhanghing; White, Marshall S.; Mack, Ronald. 2018. Vacuum steam treatment eradicates viable Bretziella fagacearum from logs cut from wilted Quercus rubra. Plant Disease. 36 p. https://doi.org/10.1094/PDIS-07-18-1252-RE.

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https://www.fs.usda.gov/treesearch/pubs/57265