Temporal development of ash dieback symptoms and spatial distribution of collar rots in a provenance trial of Fraxinus excelsior

Enderle, Rasmus; Peters, F. E.; Nakou, Aikaterini; Metzler, B.

doi:10.1007/s10342-013-0717-y

Cited by 62 publications

(122 citation statements)

References 22 publications

Supporting

Mentioning

106

Contrasting

Order By: Relevance

“…Collar necroses occurred more frequently in plots with a higher proportion of ash on the total basal area of all tree species, which is related to increased amounts of inoculum. Moreover, the probability for root collar infection was significantly greater for heavily defoliated trees, which is in agreement with other studies that demonstrated a relationship between collar necroses prevalence and crown symptoms [15,16].…”

Section: Discussionsupporting

confidence: 92%

“…On average, planar terrain is more humid than steep ground, as water takes much more time to drain off. Thus, the higher collar necroses prevalence at more planar sites is in agreement with other studies that indicated increased risks of collar necroses on wet or humid sites or sites that are periodically flooded [15,16,18,19]. Moreover, the prevalence was highest in the Upper Rhine Valley and Lake Konstanz region, where ash usually grows on humid or wet sites.…”

Section: Discussionsupporting

confidence: 90%

“…Necroses can also occur on ash root collars, which are often followed by extensive butt rot and which decisively drive mortality. H. fraxineus was frequently detected in such collar necroses and is probably the causal agent of this symptom [15][16][17][18][19][20][21]. However, there are other pathogenic fungi that frequently colonize ash collar necroses, especially species of honey fungus (Armillaria spp.).…”

Section: Introductionmentioning

confidence: 99%

“…However, there are other pathogenic fungi that frequently colonize ash collar necroses, especially species of honey fungus (Armillaria spp.). It is assumed that honey fungi act mainly as secondary pathogens in ash collar necroses but play an important aggravating role in this pathosystem [15][16][17][18][19][20][21]. Infections by these fungi are often followed by wood decay and a reduction of the stability of the trees, which can be a crucial risk for forest visitors, forestry staff, and adjacent infrastructure [5,21,22].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Ash Dieback on Sample Points of the National Forest Inventory in South-Western Germany

Enderle

Metzler

Riemer³

et al. 2018

Forests

Self Cite

View full text Add to dashboard Cite

Abstract:The alien invasive pathogen Hymenoscyphus fraxineus causes large-scale decline of European ash (Fraxinus excelsior). We assessed ash dieback in Germany and identified factors that were associated with this disease. Our assessment was based on a 2015 sampling of national forest inventory plots that represent a supra-regional area. In the time from 2012 to 2015, the number of regrown ash trees corresponded to only 42% of the number of trees that had been harvested or died. Severe defoliation was recorded for almost 40% of the living trees in 2015, and more than half of the crowns mainly consisted of epicormic shoots. Necroses were present in 24% of root collars. A total of 14% of the trees were in sound condition, which sum up to only 7% of the timber volume. On average, trees of a higher social status or with a larger diameter at breast height were healthier. Collar necroses were less prevalent at sites with a higher inclination of terrain, but there was no evidence for an influence of climatic variables on collar necroses. The disease was less severe at sites with smaller proportions of the basal area of ash compared to the total basal area of all trees and in the north-eastern part of the area of investigation. The regeneration of ash decreased drastically.

show abstract

Section: Discussionsupporting

confidence: 92%

Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ash Dieback on Sample Points of the National Forest Inventory in South-Western Germany

Enderle

Metzler

Riemer³

et al. 2018

Forests

Self Cite

View full text Add to dashboard Cite

show abstract

“…The concern about the ecological impact of this invasion is confirmed by several investigations carried out throughout Europe (Enderle et al 2013, Havrdová et al 2016, Hobson et al 2016, Queloz 2016. Recently, the recovering of surviving plants in affected areas open up new possibilities for characterization and breeding of hyposensitive trees (Kjaer et al 2011, Havrdová et al 2016, Enderle et al 2017a).…”

Section: Introductionmentioning

confidence: 92%

Evaluating the impact of Hymenoscyphus fraxineus in Trentino (Alps, Northern Italy): first investigations

Giongo¹,

Longa²,

Maso³

et al. 2017

iForest

View full text Add to dashboard Cite

The spread of Hymenoscyphus fraxineus has been causing great concern regarding the survival of European ash (Fraxinus excelsior) throughout Europe since the 1990s. The disease was first recorded in Trentino (southern Alps, Italy) in 2012 and has spread throughout the mountain landscape, where ash trees are scattered in small and isolated stands in different valleys. The status of the disease was checked by monitoring the damage to natural regeneration and adult trees in 90 sites spread over the whole region. The survey confirmed the complete colonization by the pathogen of the whole investigated area, with high levels of damage to both young and adult ash trees. Regeneration (both seedlings and saplings) was observed to be affected by the fungus in 88 plots out of 90. Out of 4486 examined young European ashes, 2261 (50.4%) were affected and 789 (17.6%) were already dead. Ten of the 384 assayed flowering ashes (Fraxinus ornus) showed symptoms on branches and apical stems, similar to those observed for European ash. Isolation and molecular analysis proved the presence of the fungus on both symptomatic European and flowering ashes. The examined 386 adult trees showed different levels of damage, sometimes reaching more than 75% of the crown. Some individual trees (42) growing close to severely damaged trees appeared fully healthy, which suggests the possible existence of some resistant/tolerant individuals in the examined populations.

show abstract

Climate of seed source affects susceptibility of coastal Douglas‐fir to foliage diseases

et al. 2017

View full text Add to dashboard Cite

Abstract. Seed-source movement trials using common garden experiments are needed to understand climate, tree (host), and pathogen interactions. Douglas-fir (Pseudotsuga menziesii var menziesii) is an important tree species native to western North America influenced by the foliar fungi Phaeocryptopus gaeumannii, a biotroph and causal agent of Swiss needle cast (SNC), and Rhabdocline species, necrotrophs that cause Rhabdocline needle cast. We used the Douglas-fir Seed-Source Movement Trial, a large provenance study of Douglas-fir that consists of populations and test sites chosen to represent the range of climate conditions experienced by Douglas-fir west of the Cascade and northern Sierra Nevada Mountains, USA, to assess disease severity and symptom expression in Douglas-fir in relation to climatic differences between test sites and population sources. Using generalized linear mixed models, probability of disease severity/expression was modeled with respect to the climate variables May through September precipitation (MSP), mean winter temperature (MWT), and continentality. Stark differences in disease expression were observed in trees from different regions, especially in relation to resistance to Rhabdocline spp. and tolerance to P. gaeumannii. There were no major differences across seed-source regions at any particular site in infection levels of P. gaeumannii assessed by fruiting body abundance, yet disease tolerance followed similar geographic patterns as resistance to Rhabdocline spp. Transfers of populations from low to high MSP, and/or cool to warm MWT, increased the probability of moderate to severe Rhabdocline spp. infection and SNC disease symptoms. Our results suggest that local seed sources are adapted to local climate and pathogen pressures and that seed sources from regions with high foliage disease pressure are most resistant/tolerant to those foliage diseases. We also confirm that temperature and precipitation are important epidemiological factors in forest disease and that assisted migration must take into account trophic interactions of trees. Movement of seed sources from dry spring and summer and/or cool winter conditions to mild, mesic environments is likely to lead to increased probability of losses due to these foliage diseases.

show abstract

Temporal development of ash dieback symptoms and spatial distribution of collar rots in a provenance trial of Fraxinus excelsior

Cited by 62 publications

References 22 publications

Ash Dieback on Sample Points of the National Forest Inventory in South-Western Germany

Ash Dieback on Sample Points of the National Forest Inventory in South-Western Germany

Evaluating the impact of Hymenoscyphus fraxineus in Trentino (Alps, Northern Italy): first investigations

Climate of seed source affects susceptibility of coastal Douglas‐fir to foliage diseases

Contact Info

Product

Resources

About