Phytophthora in Horticultural Nursery Green Waste—A Risk to Plant Health

Author:

Schiffer-Forsyth Kadiatou1,Frederickson Matika Debra Frederickson1,Hedley Pete E.2,Cock Peter J. A.2,Green Sarah1

Affiliation:

1. Forest Research, Northern Research Station, Roslin EH25 9SY, UK

2. The James Hutton Institute, Invergowrie, Dundee DD2 5DA, UK

Abstract

Phytophthora is a genus of destructive plant pathogens. Certain species are damaging to native ecosystems, forestry, and the horticultural sector, and there is evidence of their dissemination in plant imports. Horticultural nurseries are central nodes of the plant trade and previous studies have found a high diversity of Phytophthora associated with plant nursery stock. It was subsequently hypothesized that green waste disposal sites in nurseries could harbour diverse Phytophthora communities and act as a pathogen reservoir and conduit, facilitating further Phytophthora infection of nursery stock and its spread into the wider environment. This project identified Phytophthora species associated with green waste at three Scottish nurseries by sampling material from waste piles, water run-off from piles, and roots from discarded plants. Species were identified using a baiting method and sequencing of environmental DNA. Plant nursery green waste was shown to harbour diverse and varied Phytophthora species assemblages, with differences among nurseries reflecting biosecurity management practices. Eighteen Phytophthora species were detected in the samples, including the highly destructive pathogens P. ramorum and P. austrocedri. Results suggest that the improved management of waste, for example through effective on-site composting, is essential to reduce the risk of Phytophthora pathogens spreading from nurseries into the wider environment.

Funder

Rural & Environment Science and Analytical Services (RESAS) Division

Publisher

MDPI AG

Subject

Horticulture,Plant Science

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