Article Investigating the Role of Restoration Plantings in Introducing Disease—A Case Study Using Phytophthora Flora Donald 1,2,3,* , Bethan V. Purse 1 and Sarah Green 3,* 1 UK Centre for Ecology and Hydrology, Maclean Building, Benson Lane, Crowmarsh Gifford, Wallingford, Oxfordshire OX10 8BB, UK;
[email protected] 2 Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK 3 Forest Research, Northern Research Station, Roslin, Midlothian EH25 9SY, UK * Correspondence: fl
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[email protected] (S.G.) Abstract: Translocating plants to natural habitats is a long-standing conservation practice but is growing in magnitude to deliver international targets to mitigate climate change and reverse bio- diversity loss. Concurrently, outbreaks of novel plant pests and pathogens are multiplying with increased global trade network connectivity and larger volumes of imported plants, raising concerns that restoration plantings may act as introductory disease pathways. We used UK common juniper, subject since ~1995 to conservation plantings and now experiencing significant mortality from the non-native pathogen Phytophthora austrocedri Gresl. & E. M. Hansen, as an example species to explore the availability of monitoring data that could be used to assess disease risks posed by planting. We compiled spatial records of juniper planting including qualitative data on sources of planting material, propagation settings and organization types that managed planting projects. We found that juniper planting activity expanded every decade since 1990 across the UK and while not all planting resulted in outbreaks, 19% of P. austrocedri detections were found within 2 km of a known planting.