Some investigations with Beech bark disease Nectria in southern England

New ecological and physiological dimensions of beech bark disease development in aftermath forests

“…Although the exact mechanism underlying this relationship has never been demonstrated, Ehrlich (1934) and Houston (1994a) suggested it involves N. faginata spores entering and germinating in beech phloem made accessible by C. fagisuga feeding wounds (Ehrlich, 1934;Houston, 1994a). Additionally, infection may be facilitated by C. fagisuga salivary enzymes that prevent trees from callusing wounded bark during heavy infestations (Parker, 1975;Lonsdale, 1980;Perrin, 1983;Houston, 1994a). The importance of particular phenols to disease development and resistance varies by host-pathogen system (Witzell and Martin, 2008).…”

“…Mineral nutrients are important factors predisposing European beech (F. sylvatica L.) to BBD caused by N. ditissima and N. coccinea in Europe (Parker, 1975;Lonsdale and Pratt, 1981). Excessive or deficient levels of soil nitrogen (N) and phosphorus (P) increase European beech susceptibility to N. ditissima infection (Perrin and Garbaye, 1984).…”

Contribution à la connaissance de l'étiologie de la maladie de l'écorce du hêtre

“…L'etude de la flore corticale associee a la maladie de l'ecorce du hetre revele la constante presence de Nectria coeeinea, seul cryptogame releve en marge de la necrose des tissus corticaux, confirmant pleinement les conclusions de PARKER (1974). Afin de mieux eomprendre le role joue par ee champignon, nous avons procede a des inoculations artificielles de la souche isolee.…”

“…Fort des resultats de PARKER (1974), les inoculations ont eu lieu pendant la periode de repos vegetatif. L'eeorce est prealablement desinfectee en surface comme precedeniment.…”

Bark necrosis of Acer pseudoplatanus L. in northern Britain

“…Nectria coccinea sensu lato is an established wound parasite of Fagus sylvatica (PARKER 1975) and of Populus L. spp. (KONING 1938), and has also been associated with dieback of other genera including Acer L. (PEACE 1962).…”