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Compost teas provide reduction of grey mould (Botrytis cinerea Pers.) on tomato plants

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Abstract

Compost teas are watery fermented extracts with proven suppressive effects against plant pathogens. Compost teas were prepared from six different compost sources and assayed for in vitro effects against Botrytis cinerea growth. In vivo, weekly foliar application of compost teas on tomato plants and a tomato leaflet trial with undiluted and 10 × diluted teas were conducted to assess effects on grey mould caused by B. cinerea. Results showed that all tested compost teas inhibited B. cinerea growth when unsterilized. Heat- and cold-sterilization of compost teas reduced or eliminated inhibitory effects, suggesting that the presence of microorganisms is essential for inhibitory efficacy. When used as foliar sprays, bovine manure (BOV), shrimp (SHR), and garden-leaves-straw (GLS) compost teas effectively reduced disease severity for six weeks. In leaflet trials, BOV, GLS, and garden waste (GAR) compost teas caused the greatest delay in grey mould lesion expansion. Moreover, BOV, GLS, and, in particular, SHR compost teas were equally effective in undiluted and diluted form. Microbial characterization showed varying microbial compositions across all compost teas, with notably large populations of fungi or oomycetes and Pseudomonas spp. in GLS. There was no clear relationship between the source of compost (manure, other animal by-product, solely plant-based) and efficacy against grey mould. Results also indicate that the abundance of microbial populations and subpopulations did not correlate with the inhibitory effects of the teas. The diversity of microbial populations or the presence of particular microbial species is more likely to be a determining factor of compost tea efficacy.

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The authors confirm that all data generated during this study are available upon reasonable request to the corresponding author (TJA).

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Acknowledgements

We thank Edward Bruggink and Michael Shaikhet for technical assistance.

Funding

This research was supported by grant RGPIN-2020–06406 from the Natural Sciences and Engineering Council of Canada (NSERC) to TJA.

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Contributions

CB and IP prepared the original draft, performed material preparation, data collection and analysis; HS performed material preparation, data collection and analysis; CB and MLS conceived some experiments; TJA conceptualized the project and methodology, performed data analysis, supervised and administered the project, acquired project funding. All authors reviewed and approved the final manuscript.

Corresponding author

Correspondence to Tyler J. Avis.

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The authors have no competing interests to declare that are relevant to the content of this article. The authors have no relevant financial or non-financial interests to disclose.

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Bakker, C., Popescu, I., Schott, H. et al. Compost teas provide reduction of grey mould (Botrytis cinerea Pers.) on tomato plants. Eur J Plant Pathol (2024). https://doi.org/10.1007/s10658-024-02860-x

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  • DOI: https://doi.org/10.1007/s10658-024-02860-x

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