La pourriture des faines causfée par Rhizoctonia solani Kühn: Incidence de cette maladie après les fainées de 1974 et 1976. Traitement curatif des faines en vue de la conservation

Abstract

La pourriture des faines causee par Rhizoctonia solani Kiihn: Incidence de cette maladie apres les fainees de 1974 et 1976. Traitement curatif des faines en vue de la conservation Par R. PERRIN Avec la collaboration de CLAUDINE MULLER Reception du Ms. 22. 5. 1978 Abstract Rot of beechnuts caused hy Rhizoctonia solani Kiihri. Disease incidenee after the 1974 and 1976 mast years. Curative seed treatment before storage. Rot of beechnuts by Rhizoctonia solani Kiihn, occurred throughout Freneh beeeh forests after the ma.sts of 1974 and 1976. The site conditions and the climatie conditions of November and December determine the incidenee of disease which is notably reduced by soil cultivation, before the mast. Thermotherapy -24 hours at 36-38 °C at 100 % relative humidity -was shown to be a curative treatment of seeds before storage.U. S.

Does natural regeneration determine the limit of European beech distribution under climatic stress?

“…Continentality provides optimum conditions for seedling establishment and growth in two ways. Firstly, higher moisture during summer tends to increase seedling growth and decrease mortality (Madsen and Larsen, 1997;Petritan et al, 2007) whereas high moisture in winter, as in the case of Atlantic forests, improves pathogens like Rhizoctonia solani for seeds (Perrin and Muller, 1979) and Phytophtora for seedlings (Savoie et al, 1988). Secondly, winter chilling could improve germination quality by the induction of seed dormancy, the conservation of germinative capacity during winter, and the renewal of bud growth and shoot elongation (Falusi and Calamassi, 1990).…”

Rhizoctonia solani AG 2‐1 as a causative agent of cotyledon rot on European beech (Fagus sylvatica)

“…In the worst cases, natural generation of European beech has almost completely failed because of animal and insect damage and fungal infection (Le Tacon et al 1976). Regarding pathogenic fungi, Rhizoctonia solani Kü hn has been indicated as the most important pathogen attacking nuts of European beech in forest floor in France (Le Tacon et al 1976;Perrin and Muller 1979) and in Germany (Dubbel 1989). The disease is characterized by decay of cotyledons resulting in reduced failure to sprout or death after emergence.…”

“…Path. cotyledon rot of beech has not been investigated in the previous reports on the disease (Perrin and Muller 1979;Dubbel 1989). In contrast, the relatively few reports on the occurrence of this pathogen on tree seedlings often do not include a detailed description of this pathogen (Hietala and Sen 1996), and the anastomosis group of R. solani associated with, e.g.…”

“…35 (2005) Rhizoctonia solani has received considerable attention as an economically important pathogen in many agricultural crops. The disease description was as stated by Perrin and Muller (1979) and by Dubbel (1989), and correspondingly R. solani was frequently isolated from diseased seedlings. cotyledon rot of beech has not been investigated in the previous reports on the disease (Perrin and Muller 1979;Dubbel 1989).…”

“…cotyledon rot of beech has not been investigated in the previous reports on the disease (Perrin and Muller 1979;Dubbel 1989). As the previous studies on R. solani associated with beech (Perrin and Muller 1979;Dubbel 1989) do not include information on the anastomosis group and mode of infection of the pathogen, the aim of this study was to further characterize the disease and the associated pathogen. The disease description was as stated by Perrin and Muller (1979) and by Dubbel (1989), and correspondingly R. solani was frequently isolated from diseased seedlings.…”