Electrophysiological Research in Plant Pathology

Tattar, Terry A.; Blanchard, Robert O.

doi:10.1146/annurev.py.14.090176.001521

Cited by 36 publications

(19 citation statements)

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“…The lower moisture of the decay and the reaction zone and a lower concentration of mobile ions at 1.30 m than at lower heights may explain this observation. Ideally, above 30% moisture content (fibre saturation) the conductivity would only depend on the quantity of ions (Tattar and Blanchard, 1976); however, some authors have observed that electrical resistance correlated with wood moisture above 30% (Lindberg and Johansson, 1989). Indeed, we observed a drop in moisture from 1.30 m in both decay and reaction zone.…”

Section: Discussionmentioning

confidence: 58%

Accuracy of the Rotfinder instrument in detecting decay on Norway spruce (Picea abies) trees

Oliva

Romeralo

Stenlid

2011

Forest Ecology and Management

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Section: Discussionmentioning

confidence: 58%

Accuracy of the Rotfinder instrument in detecting decay on Norway spruce (Picea abies) trees

Oliva

Romeralo

Stenlid

2011

Forest Ecology and Management

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“…Fourthly, cambium damage was estimated by the electrical resistance of the cambium zone, with a Shigometer (Tattar and Blanchard, 1976;Shigo and Shortle, 1985), in the four quadrants of the bole at 0.5 m above ground (where bark char was also assessed). Two measurements were made in each quadrant.…”

Section: Sampling and Measurementsmentioning

confidence: 99%

Pinus pinaster Ait. tree mortality following wildfire in Spain

Vega

Jiménez

Vega

et al. 2011

Forest Ecology and Management

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“…This is mainly due to the fact that in most types of decayed wood moisture content (Fig. 3) and electrolyte concentrations are higher than in the surrounding uninfected wood (Tattar and Blanchard, 1976). Both of these attributes lead to a significant increase of electric conductivity.…”

Section: Discussionmentioning

confidence: 98%

“…Wood infected with decay fungi usually has different wood moisture contents than the uninfected wood and contains higher amounts of electrolytes (Tattar et al, 1972). Because moisture content and electrolytes have a strong influence on the electric properties of the material, its electric conductivity differs also (Skutt et al, 1972;Tattar and Blanchard, 1976). Therefore it should be possible to detect incipient stages of decay and to monitor the progress of rot in standing trees.…”

Section: Introductionmentioning

confidence: 99%

Non-destructive monitoring of early stages of white rot by Trametes versicolor in Fraxinus excelsior

Bieker¹,

Kehr²,

Weber³

et al. 2010

Ann. For. Sci.

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Abstract• Non-destructive detection of fungal decay in living trees is relevant for forest management of valuable species, hazard tree assessment, and research in forest pathology. A variety of tomographic methods, based on stress wave timing, radioactive radiation, or electrical resistivity have been used to detect decay in standing trees non-destructively. But apart from mobile gamma ray computed tomography (Habermehl and Ridder, 1993) which is virtually unavailable, the detection of incipient stages of decay is still not possible.• Wood moisture and electrolyte content influence the electric resistivity of wood. Both are changed by fungal decay. Therefore electric resistivity tomography (ERT) should detect decay in its early stages. Then it could be used to monitor the spatial and temporal progress of degradation.• We infected four Fraxinus excelsior trees with Trametes versicolor using wooden dowels and measured two-dimensional electric resistivity tomograms 3, 10, 13 and 21 months after infection. Immediately after the last electric resistivity measurement trees were felled for further analyses of stem cross-sections. Wood moisture content and raw density had significantly increased in infected areas, but dry density had not significantly changed after 21 months. Areas of very low electric resistivity around the infected wounds correlated very well with infected wood in the stem cross-sections. Increasing areas of low electric resistivity around the infected wounds during consecutive measurements indicate increasing areas of infected wood.• We conclude that the growth of white rot by Trametes versicolor can be monitored with electric resistivity tomography (ERT) beginning from incipient stages, even before wood density decreases. ERT could therefore be a powerful research tool for decay dynamics as well as a method for diagnosing wood decay in forestry and arboriculture.Mots-clés : développement / ERT / contrôle / tomographie / pourriture fongique du bois Résumé -Contrôle non destructif des premiers stades de la pourriture blanche de Trametes versicolor chez Fraxinus excelsior.• Le contrôle non destructif des champignons de la pourriture du bois dans les arbres vivants est pertinent pour la gestion forestière des essences précieuses, l'évaluation des risques de l'arbre, et la recherche en pathologie forestière. Une variété de méthodes de tomographie, sur la base d'onde de contraintes cadencées, des radiations radioactives, ou de la résistivité électrique ont été utilisés pour détecter la pourriture des arbres sur pied de façon non destructive. Mais, en dehors de la tomographie à rayon gamma mobile (Habermehl et Ridder, 1993) qui est pratiquement indisponible, la détection des débuts de pourriture n'est pas encore possible.• L'humidité du bois et le contenu électrolytique influence la résistivité électrique du bois. Les deux sont modifiés par la pourriture fongique. Par conséquent, la tomographie de résistivité électrique (ERT) devrait détecter la pourriture à ses débuts. Ensuite, elle pourrait être utilisée...

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Electrophysiological Research in Plant Pathology

Cited by 36 publications

References 0 publications

Accuracy of the Rotfinder instrument in detecting decay on Norway spruce (Picea abies) trees

Accuracy of the Rotfinder instrument in detecting decay on Norway spruce (Picea abies) trees

Pinus pinaster Ait. tree mortality following wildfire in Spain

Non-destructive monitoring of early stages of white rot by Trametes versicolor in Fraxinus excelsior

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