Low persistence of Phytophthora ramorum (Werres, De Cock, and Man in ‘t Veld) in western France after implementation of eradication measures

作者：Arielle Beltran, Simon Laubray, Renaud Ioos, Claude Husson, Benoît Marçais · 发表于：Annals of Forest Science · 年份：2024 · DOI：10.1186/s13595-024-01222-1 · 被引用次数：5 · 研究领域：Plant Pathogens and Resistance、Plant and Fungal Interactions Research、Plant Pathogens and Fungal Diseases

Abstract Key message Presence of Phytophthora ramorum (Werres, De Cock, and Man in ‘t Veld ) in western France was studied after the detection of this invasive pathogen in 2017 in Larix kaempferi (Lamb.) and eradication of the affected stands. P. ramorum was seldom detected in the area of the outbreak in the year following eradication. However, we confirm that P. ramorum can multiply to epidemic level on chestnuts ( Castanea sativa Mill.) in the absence of larch ( Larix spp.). This represents the major risk in France. Context Phytophthora ramorum is an invasive oomycete that causes significant damage in the USA and Europe. Although the pathogen has been present in nurseries in France since 2002, the first outbreaks in forest stands were identified in 2017 in plantations of Larix kaempferi in two forests in western France (Saint-Cadou and Hanvec). In order to limit the development of the epidemic, neighboring larch stands were clear-cut. Aim This study investigated the presence of P. ramorum in the affected area after the eradication treatment. Methods Larch stands located within a 18-km radius of the reported outbreaks were investigated. We also monitored the native woody hosts present in infected clear-cut larch stands and in the vicinity of seven ornamental nurseries that had been infected by P. ramorum on several occasions in the past. Results Overall, a very limited presence of P. ramorum was detected in 2018–2021. Two new stands of infected L. kaempferi were found close ...