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Oïdium du chêne (Erysiphe alphidoides)

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MAAF 02/05/17 Les variations interannuelles de sévérité de l'oïdium du chêne peuvent-elles s'expliquer par un effet du climat de l'hiver sur Erysiphe quercicola ? Marie-Laure Desprez-Loustau, Dominique Piou, Nicolas Feau et Benoît Marçais avec la contribution de nombreux correspondants- observateurs L'oïdium des chênes est une des maladies forestières parmi les plus communes.

MAAF 02/05/17 Les variations interannuelles de sévérité de l'oïdium du chêne peuvent-elles s'expliquer par un effet du climat de l'hiver sur Erysiphe quercicola ?

Toutefois, sa prévalence et sa sévérité sont très variables selon les années et les localités, comme le montrent bien les données de la base du Département Santé des Forêts (DSF). L’analyse de ces données, fait apparaître un certain nombre de "pics épidémiques" , en particulier dans le sud-ouest (années 1997- 2001). L’étude a cherché à comprendre si ces pics pouvaient être expliqués par des variables climatiques. De façon plutôt inattendue pour un parasite foliaire, ce ne sont pas les variables climatiques de la saison qui ressortent mais celles de l'hiver précédent.

Pour expliquer cette relation statistique, l’INRA a émis l’hypothèse que les hivers doux favoriseraient la survie hivernale du champignon. Analyse de la fréquence locale de formes drapeaux. APS JOURNAL - 2016 - Can oak powdery mildew severity be explained by indirect effects of climate on the composition of the Erysiphe pathogenic complex? WebImagesPlus… Connexion Recherche avancée Scholar Recherche avancée Articles contenant.

APS JOURNAL - 2016 - Can oak powdery mildew severity be explained by indirect effects of climate on the composition of the Erysiphe pathogenic complex?

PLoS One. 2016; 11(5): e0155344. Powdery Mildew Decreases the Radial Growth of Oak Trees with Cumulative and Delayed Effects over Years. ECOSPHERE - NOV 2016 - Temporal niche differentiation of parasites sharing the same plant host: oak powdery mildew as a case study. Arch. Biol. Sci., Belgrade, 65 (3), 1069-1077, 2013 EFFECT OF TEMPERATURE, RELATIVE HUMIDITY AND LIGHT ON CONIDIAL GERMINATION OF OAK POWDERY MILDEW (MICROSPHAERA ALPHITOIDES GRIFF. ET MAUBL.) UNDER CONTROLLED CONDITIONS.

Annals of Forest Science (2014) 71:633–642 European oak powdery mildew: impact on trees, effects of environmental factors, and potential effects of climate change. BALTIC FORESTRY - 2014 - Impact of Erysiphe alphitoides (Griffon & Maubl.) U. Braun & S. Takam. on Leaf Physiological Parameters in Pedunculate Oak (Quercus robur L.) Saplings. Forest Research Papers - MARS 2015 - Occurrence of Erysiphe alphitoides in oak stands affected by flood disaster.

1Poznań University of Life Sciences, Department of Forest Pathology, ul.

Forest Research Papers - MARS 2015 - Occurrence of Erysiphe alphitoides in oak stands affected by flood disaster

Wojska Polskiego 71c, 60–625 Poznań, Poland 2Department of Forest Entomology, Uniwersytet Przyrodniczy w Poznaniu, ul. Wojska Polskiego 71c, 60-625 Poznań, Poland Pedunculate oak (Quercus robur L.) is the most valuable deciduous tree species in Poland. For almost 30 years, an oak decline resulting from stress factors leading to a decrease of tree vitality in the long-term has been observed. TREE PHYSIOLOGY 02/10/14 Oak powdery mildew (Erysiphe alphitoides)-induced volatile emissions scale with the degree of infection in Quercus robur. NEW DISEASE REPORTS - 2016 - First record of Erysiphe alphitoides on Wisteria brachybotrys and W. frutescens, and first record of its chasmothecia on Wisteria. G.J.

NEW DISEASE REPORTS - 2016 - First record of Erysiphe alphitoides on Wisteria brachybotrys and W. frutescens, and first record of its chasmothecia on Wisteria

Denton1, J.O. Denton1* and R.T.A. Cook2 1 Plant Pathology, Royal Horticultural Society, Wisley, Woking, Surrey GU23 6QB, UK 2 30 Galtres Avenue, York YO31 1JT, UK In 2014, pale chlorotic spots with occasional cell necrosis occurred mainly on adaxial surfaces of juvenile leaves of Wisteria brachybotrys ‘Murasaki-kapitan’ and W. frutescens ‘Amethyst Falls’ (Fig. 1) at Hyde Hall (Essex) and Wisley (Surrey) Royal Horticultural Society Gardens, respectively. Mycol Res. 2007 Jul;111(Pt 7):809-26. Epub 2007 Jun 7. Phylogeny and taxonomy of the oak powdery mildew Erysiphe alphitoides sensu lato.

ACTA MYCOLOGICA Vol. 44 (1): 109–123 2009 The development of Erysiphe alphitoides and E. hypophylla in the urban environment. WIKIPEDIA ANGLOPHONE – Erysiphe alphitoides. Erysiphe alphitoides is a species of fungus which causes powdery mildew on oak trees. Discovery and taxonomy[edit] Today oak powdery mildew is one of the most common diseases in European forests but it is thought to not always have been present in these forests. The first reports of the disease were made in Paris and other regions of France, Spain, Luxembourg and the Netherlands in 1907.

By 1908 the disease had spread into many other European countries, becoming an epidemic. By 1909 it had reached Russia and Turkey, followed by Brazil in 1912 and soon after was distributed around the world. Recently, molecular biology has provided new tools for identifying species and elucidating their relatedness.

Pathology[edit] Only young developing leaves are susceptible to colonisation by E. alphitoides. Effects on host[edit] The disease can be very severe on Quercus robur and Quercus petraea in Europe, particularly on young trees. Susceptible species[edit] References[edit] WIKIPEDIA - Erysiphe alphitoides. Un article de Wikipédia, l'encyclopédie libre. Erysiphe alphitoides (anciennement Microsphaera alphitoides) est une des espèces de champignons responsables de l'oïdium du chêne.

Historique[modifier | modifier le code] Apparu en France en 1907, c'est seulement en 1911 que les chasmothèces, qui correspondent à la forme sexuée ou parfaite, ont été observés et décrits, jusqu'ici seule la forme anamorphe ou imparfaite avait été décrite. European Journal of Plant Pathology September 2009, Impact of Erysiphe alphitoides on transpiration and photosynthesis in Quercu. Mycoscience. 2006, 47(6), p. 367-373. Identity of a powdery mildew fungus occurring on Paeonia and its relationship with Erysiph.

Zoological Studies 51(2): 175-184 (2012) Changes in Oak Gall Wasps Species Diversity (Hymenoptera: Cynipidae) in Relation to the.