Abstract
The application of foliar fungicides to horticultural crops has raised public concerns worldwide. In fact, it has been demonstrated that such fungicides have an impact on non-target microorganisms in the rhizosphere. Fluopyram, triadimenol and penthiopyrad are three broad-spectrum fungicides recommended to control foliar diseases. In our experiment, these fungicides were applied to a cucumber crop to mainly control downy mildew caused by Pseudoperonospora cubensis and grey mold caused by Botrytis cinerea. At the same time, we found that these treatments also controlled other fungal pathogens affecting cucumber crops, particularly penthiopyrad, which was more effective. Once the fungicide application period was over, the effect decreased, although fungicide traces remained in the soil. Furthermore, microbial soil community analysis indicated that both fungicide treatments affect fungal communities to a greater extent than bacterial communities.
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