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What makes a compost suppressive to soilborne pathogens?

Logo, Anja; Thürig, Barbara; Oberhänsli, Thomas; Maurhofer, Monika; Widmer, Franco; Mayerhofer, Johanna and Flury, Pascale (2023) What makes a compost suppressive to soilborne pathogens? In: Book of Abstracts. ICPP 2023 One Health for all plants, crops and trees, 20-25 August, Lyon, France, p. 129.

[thumbnail of Abstract] PDF - English (Abstract)


Composts have been shown to suppress soilborne pathogens in numerous greenhouse and field experiments. However, the effectiveness of disease suppression is highly variable between composts, and we currently lack reliable indicators to select composts for plant protection. We hypothesize that disease suppression is a complex interplay between abiotic and biotic compost properties. Investigating the microbial communities may help to develop tools for predicting suppressive properties and producing composts with strong biocontrol activity.
In the first part of the project, 17 composts were assessed for disease suppression in a cress–Globisporangium ultimum (syn. Pythium ultimum) system and assessed for their physico-chemical properties. Their microbial communities were analyzed using an Illumina metabarcoding approach, which identified bacterial taxa that are indicative for disease suppression. This data set has now been extended by 30 additional composts and a cucumber–G. ultimum and a cucumber–Rhizoctonia solani test system, which revealed differences in disease suppression between pathogens and plant species. The microbial communities are currently assessed by SMRT cell long-read sequencing with the goal to get a high taxonomic resolution to accurately relate the sequencing data with isolates obtained from the composts. Our comprehensive data set provides new insights into the contribution of different abiotic and biotic factors to disease-suppressive activity of composts.

EPrint Type:Conference paper, poster, etc.
Type of presentation:Poster
Keywords:soilborne pathogens, compost, field experiments, greenhouse, Abacus, FiBL20086
Agrovoc keywords:
Subjects: Soil > Soil quality
Crop husbandry > Composting and manuring
Crop husbandry > Crop health, quality, protection
Research affiliation: Switzerland > Agroscope
Switzerland > ETHZ - Agrarwissenschaften
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Crops > Crop protection > Biocontrol
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Crops > Composting and fertilizer application > Compost
Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil > Soil quality
Switzerland > University of Basel
Related Links:https://www.icpp2023.org/sites/default/files/2023-08/ICPP2023-BOOK-ABSTRACTS-VF.pdf
Deposited By: Forschungsinstitut für biologischen Landbau, FiBL
ID Code:51990
Deposited On:08 Dec 2023 09:16
Last Modified:08 Dec 2023 09:16
Document Language:English
Refereed:Peer-reviewed and accepted

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