Abstract
Feedstock of anaerobic digestion infected with phytopathogens could enhance the risk of spreading those pathogens to uninfested field through digestate. The viability of Fusarium proliferatum, Fusarium verticillioides, Sclerotinia sclerotiorum, and Rhizoctonia solani was investigated in anaerobic digestion experiments using infected plant material of sorghum (Sorghum bicolor), sugar beet (Beta vulgaris subsp. vulgaris var. altissima), and potato (Solanum tuberosum L.). Results from lab-scale reactors were confirmed in full-scale biogas plants. Anaerobic digestion under mesophilic conditions (35–42 °C) reduced most of the phytopathogens of feedstocks investigated. Thus, S. sclerotiorum and R. solani lost their viability within 6 h. In the case of sorghum, however, Fusarium spp. infected feedstock required a maximum of 138 h for sanitation. Thus, the risk of spreading plant pathogens with the digestate can only be decreased when the feedstock would undergo an additional treatment before anaerobic digestion or of the resulting digestate.
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Acknowledgments
The investigation was funded by the German Federal Ministry of Food, Agriculture and Consumer Protection (Projektträger: Fachagentur Nachwachsende Rohstoffe, FKZ: 22013207 and 22028508, “Joint project: Studies on the phytosanitary risk associated with the anaerobic digestion of plant material in biogas plants”). We thank F. Klinkert (Klinkert Bioenergie GmbH, Erding, Germany) for allowing us to conduct experiments at their biogas plant in Wildau, C. Idler for supporting ensiling of crop material, M. Goßmann for supporting the mycological studies, B. Kroschewski for scientific support in data analysis, and T. Vöhringer, D. Hahrt, V. Plogsties, and T. Scharnhorst for insertion of hundreds of germ carriers.
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Bandte, M., Schleusner, Y., Heiermann, M. et al. Viability of Plant–Pathogenic Fungi Reduced by Anaerobic Digestion. Bioenerg. Res. 6, 966–973 (2013). https://doi.org/10.1007/s12155-013-9326-3
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DOI: https://doi.org/10.1007/s12155-013-9326-3