Relationship between presence of basidiomes, above‐ground symptoms and root infection by C<i>ollybia fusipes</i> in oaks

Marçis, B.; Caël, O.; Delatour, Claude

doi:10.1046/j.1439-0329.2000.00179.x

Cited by 14 publications

(24 citation statements)

References 6 publications

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“…did not appear to have a consistent relationship with oak crown health status. The correlation between crown health status and damages induced by C. fusipes confirmed that severe infections of this pathogen is linked to decline [26] and shows additionally that in the studied plots, most of the decline is linked to C. fusipes infection. Thereafter, it is not surprising to find several mentions of C. fusipes in association with different decline episodes [11,15].…”

Section: Discussionsupporting

confidence: 67%

“…In pedunculate oaks, hypertrophy of the bark is usually observed as infected bark is thickened up to 3-4 cm. Previous work showed that C. fusipes is consistently isolated from such lesions on oak roots [15,25,26]. The infection status of each major root was assessed within the following four classes: (0) no necrosis detected; (1) superficial necrosis present, but covering less than half of the root circumference (penetration of C. fusipes in the bark of no more than 1-2 mm); (2) necrosis covering one side of the root entirely with a penetration of the parasite in the bark usually more than 2-5 mm; (3) C. fusipes infection over the entire root circumference but root still alive (penetration of the parasite in the bark of usually more than 4-5 mm); (4) root dead with decayed wood.…”

Section: Assessment Of Root Damage Induced By C Fusipesmentioning

confidence: 99%

“…It is a slow primary parasite that produces typical orange lesions on large roots and causes a drastic destruction of the root system [25]. In some types of soil, severe root infection was associated with a deterioration of crown health status in particular in coarse textured soils [26].…”

Section: Introductionmentioning

confidence: 99%

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Relationships between soil factors, Quercus robur health, Collybia fusipes root infection and Phytophthora presence

Camy¹,

Delatour²,

Marçais³

2003

Ann. For. Sci.

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-About sixty oaks (Quercus robur), with different status of crown health, located in three plots in north eastern France were assessed for their degree of infection by C. fusipes. Baiting of Phytophthora spp. from soil was carried out at different seasons in a sub sample of these oaks. The variability of soil characteristics, such as depth to waterlogging signs and depth to a gravel layer limiting rooting was evaluated. Soil factors were tightly correlated. Infection induced by C. fusipes was significantly more severe in non-waterlogged conditions. In two plots Phytophthora spp. were present at the base of the majority of trees investigated. Success of Phytophthora isolation was significantly linked with the season. The crown health status deteriorates with increasing severity of infection by C. fusipes and with the depth to waterlogging. Conversely, Phytophthora was not correlated with crown health status.Quercus / Collybia fusipes / root rot fungus / Phytophthora sp. / oak decline Résumé -Relations entre les facteurs du sol, l'état du houppier de Quercus robur, les infections racinaires induites par Collybia fusipes et la présence de Phytophthora. Le niveau d'infection induit par Collybia fusipes a été évalué sur environ 60 chênes pédonculés (Quercus robur) présentant différents états sanitaires, situés dans trois parcelles du nord-est de la France. Le piégeage des Phytophthora spp. présents dans le sol a été effectué sur un sous-échantillon de chênes à différentes saisons. La variabilité des facteurs du sol concernant la profondeur d'apparition des traces d'hydromorphie et la profondeur d'apparition d'un plancher de graviers limitant l'enracinement a été évaluée. Les facteurs du sol étaient fortement inter-dépendants. Les infections induites par C. fusipes diminuaient lorsque les traces d'hydromorphie apparaissaient plus profondément. Différentes espèces de Phytophthora ont été détectées dans deux des trois parcelles. Les Phytophthora étaient alors présents à la base de la majorité des chênes. La détection positive des Phytophthora était fortement liée à la saison de piégeage. L'état sanitaire des chênes diminuait avec la sévérité des infections induites par C. fusipes et la profondeur d'apparition des traces d'hydromorphie. Au contraire, aucun lien n'a pu être mis en évidence entre l'état sanitaire des chênes et la présence du Phytophthora dans le sol.Quercus / Collybia fusipes / pourridié / Phytophthora sp. / dépérissement du chêne

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Section: Discussionsupporting

confidence: 67%

Section: Assessment Of Root Damage Induced By C Fusipesmentioning

confidence: 99%

See 1 more Smart Citation

Relationships between soil factors, Quercus robur health, Collybia fusipes root infection and Phytophthora presence

Camy¹,

Delatour²,

Marçais³

2003

Ann. For. Sci.

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“…However, efforts to demonstrate that oak trees growing in sandy soils or subjected to water shortage were more susceptible to C. fusipes were not successful [35,37]. Furthermore, it was demonstrated that, at a given level of root destruction by C. fusipes, the likelihood of decline of a tree was greater in a sandy loam compared to a clay loam [36,126]. This could be explained by a decreased ability of root-damaged trees to cope with situations of poor water availability.…”

Section: Possible Role Of Root Pathogens In Declines Associated With mentioning

confidence: 99%

Interactive effects of drought and pathogens in forest trees

et al. 2006

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-This review synthesizes the available knowledge on drought-disease interactions in forest trees with a focus on (1) evidence and patterns of drought-disease interactions, (2) current understanding of processes and mechanisms, and (3) three well documented cases studies. The first part is based on the analysis of a database of slightly more than one hundred studies, obtained by keyword searches combining drought, diseases or pathogens, and forest trees. A large majority of published studies referred to a positive association between drought and disease, i.e. disease favoured by drought or drought and disease acting synergistically on tree health status, with a predominance of canker/dieback diseases, caused by pathogens like Botryosphaeria, Sphaeropsis, Cytospora and Biscognauxia (Hypoxylon). The type of disease-related variables (incidence vs. severity) and the intensity and timing of water stress were shown to be significant factors affecting the drought-infection interaction. Interactions with other abiotic stresses and species-specific and genetic effects, related to host or pathogen, have also been reported. Direct effects of drought on pathogens are generally negative, although most fungal pathogens exhibit an important plasticity and can grow at water potentials well below the minimum for growth of their host plants. Studies on indirect effects of drought on pathogens through other community interactions are still relatively scarce. Positive drought-infection effects can mostly be explained by indirect effects of drought on host physiology. The predisposition and the multiple stress hypotheses are presented, as well as recent developments in the study of the molecular basis of abiotic and biotic stress, and their interactions. Sphaeropsis sapinea on pines, Biscognauxia mediterranea on oaks and root pathogens in declines associated with drought provide illustrative examples, treated as case studies, of pathogens of current significance associated with drought. The conclusion highlights some knowledge gaps, e.g. the role of latent parasites and the shift to a pathogenic stage, or the genetics of some fungal groups. The need for prevention of pathogen dispersal, especially crucial in the case of latent pathogens, is emphasized. drought / water stress / pathogenic fungi / predisposition / forest trees Résumé -Interactions entre sécheresse et agents pathogènes chez les arbres forestiers. Cette revue synthétise les connaissances actuelles sur les interactions entre sécheresse et maladies chez les arbres forestiers, avec trois grandes parties : (1) description des types d'interaction ; (2) connaissances acquises sur les mécanismes impliqués ; (3) trois études de cas bien étudiées. La première partie est basée sur l'analyse d'une base de données d'une centaine d'études, sélectionnées par recherche sur mots clés. La plupart de ces études se rapportent à des maladies favorisées par la sécheresse ou à un effet synergique entre sécheresse et maladie sur l'état sanitaire des arbres, avec une prédominance de m...

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“…The interaction between insect defoliation and powdery mildew has been less frequently invoked to explain more recent oak declines (but see Selochnik et al 1994, Thomas et al 2002, Petercord 2011) while other inciting factors, especially drought and root pathogens have been put forward (Landmann et al 1993;Brasier et al 1993;Jung et al 2000;Marçais et al 2000). However, insect defoliations remain very important causes of oak decline (Landmann et al 1993, Thomas et al 2002 and Gerard et al 2013 showed that very severe powdery mildew infection were common after insect defoliations.…”

Section: Powdery Mildew As a Contributing Factor Of Oak Decline Espementioning

confidence: 99%

European oak powdery mildew: impact on trees, effects of environmental factors, and potential effects of climate change

Marçais

Desprez‐Loustau

2012

Annals of Forest Science

138

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• Context Powdery mildew is one of the most common diseases of oaks in Europe. After alarming reports in the beginning of the twentieth century following the presumed introduction of the invasive fungus, the disease has become familiar to foresters. However, its impact may vary greatly according to intrinsic and extrinsic factors. • Aims We aimed at providing updated and synthesised information on the impact of powdery mildew on oak and on the effects of environment on disease. • Methods A comprehensive literature review was performed, including old reports of the early epidemics to more recent data. • Results Tree growth patterns are of critical importance to explain the severity of the disease and the differences between juvenile and mature trees. A critical element, especially for infection of mature trees, is the availability of spores during the production of the first leaf flush. High disease impact is often related to modified growth patterns, either by environmental factors (insects or frost) or silvicultural practices (e.g., coppicing). • Conclusion Powdery mildew can have important impacts in natural oak regenerations and a significant role in decline of mature trees. Climate change might influence the disease severity mainly by altering the host pathogen phenological synchrony. Process-based models are required for reliable predictions.

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Relationship between presence of basidiomes, above‐ground symptoms and root infection by Collybia fusipes in oaks

Cited by 14 publications

References 6 publications

Relationships between soil factors, Quercus robur health, Collybia fusipes root infection and Phytophthora presence

Relationships between soil factors, Quercus robur health, Collybia fusipes root infection and Phytophthora presence

Interactive effects of drought and pathogens in forest trees

European oak powdery mildew: impact on trees, effects of environmental factors, and potential effects of climate change

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