Morphological and Molecular Characteristics of the Oak Tree Canker Pathogen, <i>Annulohypoxylon truncatum</i>

Cha, Jaeyul; Heo, Bitna; Ahn, Soo Jeong; Gang, Guen-Hye; Park, Chung Gyoo; Kwak, Youn Sig

doi:10.5941/myco.2012.40.1.079

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…The morphological characteristic of the fungi were compared to previously identified Hypoxylon images ( Fig. 1B ) ( Ju and Rogers, 1996 ; Cha et al, 2012 ).…”

Section: Methodsmentioning

confidence: 99%

Oak Tree Canker Disease Supports Arthropod Diversity in a Natural Ecosystem

Lee

Park

et al. 2014

The Plant Pathology Journal

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Microorganisms have many roles in nature. They may act as decomposers that obtain nutrients from dead materials, while some are pathogens that cause diseases in animals, insects, and plants. Some are symbionts that enhance plant growth, such as arbuscular mycorrhizae and nitrogen fixation bacteria. However, roles of plant pathogens and diseases in natural ecosystems are still poorly understood. Thus, the current study addressed this deficiency by investigating possible roles of plant diseases in natural ecosystems, particularly, their positive effects on arthropod diversity. In this study, the model system was the oak tree (Quercus spp.) and the canker disease caused by Annulohypoxylon truncatum, and its effects on arthropod diversity. The oak tree site contained 44 oak trees; 31 had canker disease symptoms while 13 were disease-free. A total of 370 individual arthropods were detected at the site during the survey period. The arthropods belonged to 25 species, 17 families, and seven orders. Interestingly, the cankered trees had significantly higher biodiversity and richness compared with the canker-free trees. This study clearly demonstrated that arthropod diversity was supported by the oak tree canker disease.

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“…The morphological characteristic of the fungi were compared to previously identified Hypoxylon images ( Fig. 1B ) ( Ju and Rogers, 1996 ; Cha et al, 2012 ).…”

Section: Methodsmentioning

confidence: 99%

Oak Tree Canker Disease Supports Arthropod Diversity in a Natural Ecosystem

Lee

Park

et al. 2014

The Plant Pathology Journal

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“…Despite its wide distribution, very poor information is available on biology and damage of A. truncatum . Severe cankers have been observed in Korea on Quercus acutissima and Q. variabilis , causing dark brown discoloration of the sap in affected trees; dark brown glomerate stromata with spherical perithecia are associated with the cankers (Cha et al., 2012 ). In North America, the fungus was only found on dead branches of Quercus spp.…”

Section: Canker Fungi and Other Fungi Associated With Sapwood ( ...mentioning

confidence: 99%

Commodity risk assessment of maple veneer sheets from Canada

Bragard,

Baptista,

Chatzivassiliou

et al. 2024

EFS2

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The European Commission requested the EFSA Panel on Plant Health to deliver a risk assessment on the likelihood of pest freedom from Union quarantine pests and pests subject to measures adopted pursuant to Article 30 of Regulation (EU) No 2016/2031 for the maple veneer sheets manufactured according to the process set out by Canada, with emphasis on the freedom from Davidsoniella virescens and Phytophthora ramorum (non‐EU isolates). The assessment was conducted for veneer sheets of up to 0.7 mm and up to 6 mm thickness, taking into account the different phases in the veneer production in a systems approach. Some of those phases, taken alone, including the heat treatment of logs in a water bath, the cutting into thin veneer sheets and the final high heat drying of veneer sheets are expected to be effective against some of the pests, without uncertainties, making the system approach fully effective. The panel considers that no insects would survive cutting of logs into thin veneer sheets of 0.7 mm and that Xylella fastidiosa will not survive the temperatures in the water bath and final drying of veneers. The degree of pest freedom for the different groups of organisms is generally very high with slightly lower degree of pest freedom for veneer sheets of 6 mm thickness because of lower temperatures reached in the final drying of veneer sheets compared to thinner sheets. P. ramorum is not expected to survive the high heat drying of thin veneer sheets, but it may survive the lower temperatures inside thicker veneer sheets. The Expert Knowledge Elicitation (EKE) indicated, with 95% certainty, that between 9989 and 10,000 veneer sheets (thickness 6 mm) per 10,000 will be free from living P. ramorum. For D. virescens, the EKE indicated, with 95% certainty, that between 9984 and 10,000 veneer sheets (0.7 mm) per 10,000 and that between 9954 and 10,000 veneer sheets (6 mm) per 10,000 will be free from living inoculum. For other relevant groups of pests, the greatest likelihood of pest presence was observed for wood decay fungi. The EKE indicated, with 95% certainty, that between 9967 and 10,000 veneer sheets (0.7 mm) per 10,000 and that between 9911 and 10,000 veneer sheets (6 mm) per 10,000 will be free from living wood decay fungi.

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