First report of Neonectria neomacrospora on Abies grandis in Belgium

摘要

In June 2017, symptoms of shoot dieback were detected on natural regeneration of an Abies grandis (grand fir) stand located in southern Belgium (Luxembourg province). The affected saplings were between five to ten years old and located in the understorey of grand fir planted in the early 1970's. Symptoms were observed on about 20% of the saplings which showed shoot tip necroses (Fig. 1) affecting lateral as well as terminal shoots. Bark of the necrotic areas displayed a purple to reddish colour and a reduction of shoot diameter was occasionally observed. Necroses were also associated with a browning and shedding of needles.