Erysiphe alphitoides causes powdery mildew on Eucalyptus gunnii

2017 ◽  
Vol 48 (1) ◽  
pp. e12377 ◽  
Author(s):  
S. E. Cho ◽  
S. H. Lee ◽  
S. K. Lee ◽  
S. T. Seo ◽  
H. D. Shin
Keyword(s):  
Powdery Mildew ◽  
Erysiphe Alphitoides

Phylogeny and taxonomy of the oak powdery mildew Erysiphe alphitoides sensu lato

2007 ◽  
Vol 111 (7) ◽  
pp. 809-826 ◽  
Author(s):  
Susumu Takamatsu ◽  
Uwe Braun ◽  
Saranya Limkaisang ◽  
Sawwanee Kom-un ◽  
Yukio Sato ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Erysiphe Alphitoides

scholarly journals Relationships between the Pathogen Erysiphe alphitoides, the Phytophagous Mite Schizotetranychus garmani (Acari: Tetranychidae) and the Predatory Mite Euseius finlandicus (Acari: Phytoseiidae) in Oak

Insects ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 981
Author(s):  
Slobodan Milanović ◽  
Katarina Mladenović ◽  
Bojan Stojnić ◽  
Alejandro Solla ◽  
Ivan Milenković ◽  
...  
Keyword(s):  
Body Size ◽  
Powdery Mildew ◽  
Population Density ◽  
The Body ◽  
Pedunculate Oak ◽  
Adult Size ◽  
Phytophagous Mite ◽  
Euseius Finlandicus ◽  
Erysiphe Alphitoides ◽  
The Impact

Food webs on forest trees include plant pathogens, arthropods, and their natural enemies. To increase the understanding of the impact of a plant pathogen on herbivore-natural enemy interactions, we studied the powdery mildew fungus Erysiphe alphitoides, the phytophagous mite Schizotetranychus garmani, and the predatory and mycophagous mite Euseius finlandicus in pedunculate oak (Quercus robur) leaves. In June, July and August of 2016, we assessed the severity of powdery mildew, mite population density and adult female mite size in 30 trees in three forests near Belgrade, Serbia. In August, the infection severity of E. alphitoides related positively to the population density of S. garmani and negatively to the body size of S. garmani females. Throughout the vegetative season, the infection severity of E. alphitoides related positively to the population density of E. finlandicus but not to its body size. The effect of E. alphitoides on the population density and adult size of S. garmani was not mediated by the population density of E. finlandicus, and vice versa. Interactions were consistent in all forests and varied with the summer month. Our findings indicate that E. alphitoides can influence the average body size and population densities of prey and predatory mites studied, irrespective of predator-prey relationships.

Molecular phylogenetic analyses reveal a close relationship between powdery mildew fungi on some tropical trees and Erysiphe alphitoides, an oak powdery mildew

Mycoscience ◽  
2006 ◽  
Vol 47 (6) ◽  
pp. 327-335 ◽  
Author(s):  
Saranya Limkaisang ◽  
Susumu Takamatsu ◽  
James Henry Cunnington ◽  
Liew Kon Wui ◽  
Baharuddin Salleh ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Phylogenetic Analyses ◽  
Tropical Trees ◽  
Erysiphe Alphitoides ◽  
Close Relationship ◽  
Molecular Phylogenetic ◽  
Powdery Mildew Fungi

scholarly journals Trichoderma asperellum efficiently protects Quercus robur leaves against Erysiphe alphitoides

2020 ◽  
Author(s):  
Tomasz Oszako ◽  
Dmitry Voitka ◽  
Marcin Stocki ◽  
Natalia Stocka ◽  
Justyna Anna Nowakowska ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Rna Polymerase Ii ◽  
Quercus Robur ◽  
Biocontrol Agent ◽  
Elongation Factor ◽  
Preventive Measure ◽  
Protective Effects ◽  
Trichoderma Asperellum ◽  
Erysiphe Alphitoides ◽  
Forest Nurseries

AbstractThe protective effects of Trichoderma asperellum IZR D-11 as a biocontrol agent against the powdery mildew Erysiphe alphitoides infecting leaves of Quercus robur were evaluated for the first time. A strain of Trichoderma had earlier been isolated in Belarus, and was identified in this study as T. asperellum by sequencing of three genomic markers: internal transcribed spacer, translation elongation factor 1 alpha and RNA polymerase II subunit 2, with over 99.2% identity to corresponding genomic sequences in GenBank. When applied once in the first year just after onset of powdery mildew disease, T asperellum IZR D-11 reduced disease progression and continued to reduce powdery mildew levels during the following three years. Photosynthetic activity as represented by chlorophyll fluorescence measured in oak seedlings was increased in treated plants, and greater assimilate production was also found. The use of this antagonistic fungus increased the total water content in oak leaves suggesting that T. asperellum IZR D-11 can serve as a preventive measure to reduce energy losses in the process of water transpiration. GC-MS analysis detected 49 volatile compounds in the headspace of pure cultures of T. asperellum. Sesquiterpenes represented mainly by daucene, dauca-4(11),8-diene and isodaucene were the largest group of compounds emitted. We speculate that these volatiles from T. asperellum IZR D-11 may be involved in induced resistance in the plant, but further research is needed. The above results suggest that T. asperellum strain IZR D-11 has potential as a biocontrol agent of oak powdery mildew in forest nurseries.

scholarly journals First Report of Powdery Mildew Caused by Erysiphe alphitoides on Euonymus japonicas and Its Natural Teleomorph Stage in China

Plant Disease ◽  
2017 ◽  
Vol 101 (2) ◽  
pp. 387-387
Author(s):  
J. G. Huang ◽  
M. Y. Chi ◽  
X. M. Sun ◽  
H. W. Qian ◽  
W. X. Liang ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
First Report ◽  
Erysiphe Alphitoides

scholarly journals Can Oak Powdery Mildew Severity be Explained by Indirect Effects of Climate on the Composition of the Erysiphe Pathogenic Complex?

2017 ◽  
Vol 107 (5) ◽  
pp. 570-579 ◽  
Author(s):  
Benoit Marçais ◽  
Dominique Piou ◽  
Damien Dezette ◽  
Marie-Laure Desprez-Loustau
Keyword(s):  
Powdery Mildew ◽  
Indirect Effects ◽  
Fungal Pathogens ◽  
Critical Role ◽  
Disease Dynamics ◽  
Complementarity Effect ◽  
Disease Epidemiology ◽  
Erysiphe Alphitoides ◽  
Climate Influences

Coinfection by several pathogens is increasingly recognized as an important feature in the epidemiology and evolution of plant fungal pathogens. Oak mildew is induced by two closely related Erysiphe invasive species (Erysiphe alphitoides and E. quercicola) which differ in their mode of overwintering. We investigated how climate influences the co-occurrence of the two species in oak young stands and whether this is important for the disease epidemiology. We studied the frequency of flag-shoots (i.e., shoots developing from infected buds, usually associated with E. quercicola) in 95 oak regenerations over a 6-year period. Additionally, in 2012 and 2013, the oak mildew severity and the two Erysiphe spp. relative frequencies were determined in both spring and autumn in 51 regenerations and 43 1-year-old plantations of oaks. Both the frequency of flag-shoots and the proportion of Erysiphe lesions with E. quercicola presence were related to climate. We showed that survival of E. quercicola was improved after mild winters, with increase of both the flag-shoot frequency and the proportion of Erysiphe lesions with E. quercicola presence in spring. However, disease severity was not related to any complementarity effect between the two Erysiphe spp. causing oak powdery mildew. By contrast, increased E. alphitoides prevalence in spring was associated with higher oak mildew severity in autumn. Our results point out the critical role of between-season transmission and primary inoculum to explain disease dynamics which could be significant in a climate-warming context.

scholarly journals Occurrence of Erysiphe alphitoides in oak stands affected by flood disaster

2015 ◽  
Vol 76 (1) ◽  
pp. 73-77
Author(s):  
Wojciech Szewczyk ◽  
Robert Kuźmiński ◽  
Małgorzata Mańka ◽  
Hanna Kwaśna ◽  
Piotr Łakomy ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
Statistical Significance ◽  
Carbon Assimilation ◽  
Stress Factors ◽  
Deciduous Tree ◽  
Pedunculate Oak ◽  
Oak Decline ◽  
Tree Vitality ◽  
Erysiphe Alphitoides ◽  
Assimilation Capacity

Abstract 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. The aim of the present study was to determine the proportion of leaves infected by the fungus Erysiphe alphitoides, the cause of powdery mildew, in post-flood oak stands situated in the Forest District Wołów (51°32’N, 16°62’E) as well as to evaluate effects of powdery mildew with respect to the oak decline. In order to record the powdery mildew incidence, we selec ted three trees in each of the ten investigated oak stands, and 200 leaves were collected from the upper part of the crowns. The percentage of infected leaves as well as the reduction of carbon assimilation capacity was assessed. Furthermore, we evaluated the average reduction of carbon assimilation capacity and the percentage of withering branch tips in 25 adjacent trees. Incidences of powdery mildew were observed in seven out of the ten stands. The maximum tree damage did not exceed 22% leaf infection and mean defoliation within the study areas ranged from 18% to 61.4%. Non-withering branch tips were observed in one post-flood area as well as in one area situated outside the flooded region. Within the remaining areas studied, the average proportion of withering branch tips ranged from 0.4% to 13.8%. Statistical analyses showed that differences between the investigated stands with regard to the rate of powdery mildew occurrence were not significant. Correlating the means, however, revealed a relationship between powdery mildew incidence and branch tip withering. This relationship is a possible indication of the ongoing oak dieback. No statistically significant relationship between tree defoliation and powdery mildew incidence was found. The lack of statistical significance, as observed here, implies that water stagnation within the investigated stands had no effect on Erysiphe alphitoides infection.

scholarly journals The influence of phosphite treatments on oak leaves and damage caused by powdery mildew Erysiphe alphitoides

2017 ◽  
Vol 59 (3) ◽  
pp. 239-245
Author(s):  
Piotr Andrzej Dąbrowski ◽  
Hazem Kalaji ◽  
Nenad Keča ◽  
Tomasz Horaczek ◽  
Tomasz Oszako
Keyword(s):  
Powdery Mildew ◽  
Leaf Area ◽  
Leaf Surface ◽  
Negative Consequences ◽  
Erysiphe Alphitoides ◽  
Oak Leaves

AbstractThe aim of the project was to check the influence of ammonium phosphite preparation − Actifos on the physiology of leaves and a possible reduction of infection by the fungus a year after the application of fertilizer. Three observation plots were selected in Karczma Borowa, Krotoszyn and Piaski Forest Districts (FD). In each of these observation plots, trees were chosen randomly. In Karczma Borowa FD, the trees were treated by watering them with a 3% solution of Actifos. In Krotoszyn FD, the leaves of trees were sprayed twice (in July and September) from the plane using a 50% solution of Actifos; and in Piaski FD, only the trunks of tress were sprayed twice the same way, but in July 2012 and September 2013. In October 2013, from each tested tree, ten leaves were selected randomly from the upper, well-lit parts of their crowns. The assessment of leaf surface damaged by mycelium and chlorophyllafluorescence was performed. After the application of the phosphite, no negative physiological consequences for the treated trees were noticed − neither concerning the average leaf area nor the fluorescence of chlorophyll. The manner of phosphite application (leaves, trunks or roots) did not cause any negative consequences for the vitality/health of the treated trees as compared to the control trees. A certain tendency in the reduction of oak mildew on the treated leaves with phosphite was observed, however these observations should be continued in the next years.

scholarly journals First Report of Powdery Mildew Caused by Erysiphe alphitoides on Exochorda racemosa in China

Plant Disease ◽  
2018 ◽  
Vol 102 (10) ◽  
pp. 2037-2037
Author(s):  
Y. Zhang ◽  
X. Li ◽  
Z. W. Dong ◽  
M. M. Wang ◽  
G. Chen ◽  
...  
Keyword(s):  
Powdery Mildew ◽  
First Report ◽  
Erysiphe Alphitoides
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