Assessment of ozone visible symptoms in the field: perspectives of quality control

Bussotti, Filippo; Schaub, Marcus; Cozzi, Alberto; Kräuchi, Norbert; Ferretti, Marco; Novak, K.; Skelly, J. M.

doi:10.1016/s0269-7491(03)00095-2

Cited by 45 publications

(26 citation statements)

References 5 publications

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“…We calculated difference (Dif), defined as the field team measurement minus the control measurement, percentage difference (PDif), defined as absolute difference divided by the control team measurement, and standard deviation (SD) of the differences, a measure of random measurement errors (Solberg andStrand 1999, Kaufmann andSchwyzer 2001). The statistical significance of differences between Dif and PDif of the first and second levels of training and Dif and PDif of the second and third levels of training was determined by the Wilcoxon sign test (Dobbertin et al 2004, Bussotti et al 2003 and for SD by the F-test.…”

Section: Discussionmentioning

confidence: 99%

Effects of training for inexperienced surveyors on data quality of tree diameter and height measurements

Kitahara¹,

Mizoue²,

Yoshida³

2010

Silva Fenn.

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, S. 2010. Effects of training for inexperienced surveyors on data quality of tree diameter and height measurements. Silva Fennica 44(4): 657-667.Due to the large number of sample plots and variables to be measured, inexperienced surveyors are expected to take field measurements in National Forest Inventories (NFIs). However, very little information exists on the data quality that can be expected from inexperienced surveyors given different levels of training. We evaluated the quality of data produced by inexperienced undergraduate students when measuring the most fundamental variables: tree diameter using a diameter tape and height using an ultrasonic Vertex III hypsometer. We found that a single training session on how to use the instruments and how to reduce measurement errors was insufficient for inexperienced surveyors to achieve measurement quality objectives (MQOs). Providing a single feedback of control team measurements significantly improved data quality, except in the measurements of tree height of broad-leaved trees, but additional feedback did not contribute to further improvement. We propose that field training courses for inexperienced surveyors incorporate a one-day exercise with feedback instruction.

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Section: Discussionmentioning

confidence: 99%

Effects of training for inexperienced surveyors on data quality of tree diameter and height measurements

Kitahara¹,

Mizoue²,

Yoshida³

2010

Silva Fenn.

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“…The H-B scale continues to be used in plant pathology (Hagan et al 2003;Keinath et al 2006;Stevenson et al 2007), and has been adopted in other disciplines (Pernezney et al 2008;Bussotti et al 2003;Chappelka et al 2003). Choosing to use an H-B type disease scale will depend on a decision based on the trade-offs between time taken to perform the assessment, sample size, precision and accuracy, and reliability of the data.…”

Section: Advantages and Disadvantages Of The H-b Scalementioning

confidence: 99%

“…The Horsfall and Barratt (H-B) scale was developed in the early 1940s as the science of plant pathology was becoming more quantitative (Horsfall 1986). The scale has been used widely, and is still used by plant pathologists (Mila et al 2005;Lang et al 2007;Stevenson et al 2007), and has been adopted in other disciplines (Pernezney et al 2008;Bussotti et al 2003;Chappelka et al 2003). The impact of the H-B scale can be further established by it being noted as a "Citation Classic" in Current Contents (Horsfall 1986).…”

Section: Introductionmentioning

confidence: 99%

The Horsfall-Barratt scale and severity estimates of citrus canker

Bock

Gottwald

Parker³

et al. 2009

Eur J Plant Pathol

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Citrus canker assessment data were used to investigate effects of using the Horsfall-Barratt (H-B) scale to estimate disease compared to direct estimation to the nearest percent. Twenty-eight raters assessed each of two-hundred infected leaves (0-38% true diseased area). The data were converted to the H-B scale. Correlation (r) showed that direct estimates had higher inter-rater reliability compared to H-B scaled data (r=0.75 and 0.71 for direct estimates and H-B scaled data, respectively). Lin's concordance correlation (LCC, ρ c ) analysis showed individual rater estimates by direct estimation had better agreement with true values compared to H-B scaled data. The direct estimates were more precise compared to H-B scaled data (r=0.80-0.95 and 0.61-0.90, respectively), but measures of generalised bias or accuracy (C b ) were similar for both methods (0.38-1.00). Cumulative mean disease and cumulative variance of the means were calculated for each rater on a leaf-by-leaf basis. Direct estimates were closer to the true severity 59.5% of the time, and to the cumulative true sample mean 53.7% of the time, and to the cumulative true sample mean variance 63.6% of the time. Estimates of mean severity for each leaf based on estimates by 3, Eur J Plant Pathol (2009) 125:23-38 5, 10, 20 and 28 raters were compared to true disease severity. LCC showed that rater-means based on more raters had better agreement with true values compared to individual estimates, but H-B scale data were less precise, although with means based on ≥10 raters, agreement was the same for both assessment methods. Magnitude and dispersion of the variance of the means based on H-B scaled data was greater than that by direct estimates. H-B scaling did not improve reliability, accuracy or precision of the estimate of citrus canker severity compared to direct visual estimation.

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“…Consequently, the relatively few indicators of environmental stress, including pollution, that are in practical use tend to be gross and nonspecific (Mayer et al 1992), such as the observation of visible injury symptoms in plants (Jacobson and Hill 1970;Bussotti et al 2003;Weinstein and Davison2003).…”

Section: Species Attributes For Biological Monitoringmentioning

confidence: 99%

Rapid quantitative assessment of visible injury to vegetation and visual amenity effects of fluoride air pollution

Doley

2008

Environ Monit Assess

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Quantitative measures of visible injury are proposed for the protection of the aesthetic acceptability and health of ecosystems. Visible indications of air pollutant injury symptoms can be assessed rapidly and economically over large areas of mixed species such as native ecosystems. Reliable indication requires close attention to the criteria for assessment, species selection, and the influence of other environmental conditions on plant response to a pollutant. The estimation of fluoride-induced visible injury in dicotyledonous species may require techniques that are more varied than the measurement of necrosis in linear-leaved monocotyledons and conifers. A scheme is described for quantitative estimates of necrosis, chlorosis and deformation of leaves using an approximately geometric series of injury categories that permits rapid and sufficiently consistent determination and recognises degrees of aesthetic offence associated with foliar injury to plants.

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Assessment of ozone visible symptoms in the field: perspectives of quality control

Cited by 45 publications

References 5 publications

Effects of training for inexperienced surveyors on data quality of tree diameter and height measurements

Effects of training for inexperienced surveyors on data quality of tree diameter and height measurements

The Horsfall-Barratt scale and severity estimates of citrus canker

Rapid quantitative assessment of visible injury to vegetation and visual amenity effects of fluoride air pollution

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