Disease severity assessment in epidemiological studies: accuracy and reliability of visual estimates of Septoria leaf blotch (SLB) in winter wheat

Poster

El Jarroudi, Moussa, Kouadio, Louis, Mackels, Christophe, Tychon, Bernard, Delfosse, Philippe and Bock, Clive H.. 2014. "Disease severity assessment in epidemiological studies: accuracy and reliability of visual estimates of Septoria leaf blotch (SLB) in winter wheat." 2014 APS-CPS Joint Meeting. Minneapolis, United States of America 09 - 13 Aug 2014 United States. American Phytopathological Society. https://doi.org/10.1094/PHYTO-104-11-S3.1
Paper/Presentation Title

Disease severity assessment in epidemiological studies: accuracy and reliability of visual estimates of Septoria leaf blotch (SLB) in winter wheat

Presentation TypePoster
AuthorsEl Jarroudi, Moussa (Author), Kouadio, Louis (Author), Mackels, Christophe (Author), Tychon, Bernard (Author), Delfosse, Philippe (Author) and Bock, Clive H. (Author)
Journal or Proceedings TitlePhytopathology: International Journal of the American Phytopathological Society
Journal Citation104 (Suppl. 3, No. 11), p. S3.37
Article NumberS3.37
Number of Pages1
Year2014
PublisherAmerican Phytopathological Society
Place of PublicationUnited States
ISSN0031-949X
1943-7684
Digital Object Identifier (DOI)https://doi.org/10.1094/PHYTO-104-11-S3.1
Conference/Event2014 APS-CPS Joint Meeting
Event Details
2014 APS-CPS Joint Meeting
Event Date
09 to end of 13 Aug 2014
Event Location
Minneapolis, United States of America
Abstract

Several methods are available to measure the severity of Septoria leaf blotch (SLB) of winter wheat but differ in accuracy, reliability, ease of use and rapidity. The accuracy and reliability of visual assessments of SLB severity by raters was determined by comparison with assumed actual values obtained by digital image analysis. Raters included one plant pathologist with extensive experience of visual disease assessment, and three other raters who were trained prior to field observations using standard area diagrams and the software DISTRAIN. Initially analyses were performed using SLB severity over the full 0-100% range; subsequently, to explore error over short ranges of the 0-100% scale, the scale was divided into sequential 10%-increments (i.e., 0-10%, 10-20%,…90-100%) based on the actual values. Lin’s concordance correlation (LCC) analysis demonstrated that all raters were accurate when compared over the whole severity range (LCC coefficient (ρc) = 0.92-0.99). However, agreement between actual SLB severities and the estimates by raters was less good when compared over the short intervals of the 10×10% classes (ρc = -0.12-0.99, depending on the percentage class and the experiment), demonstrating that agreement will vary depending on the actual disease range over which it is compared. Inter-rater reliability over the full 0-100% range measured using correlation analysis was high between each pair of raters (r = 0.970 to 0.992, P<0.0001), which was confirmed by the inter-class correlation coefficient (ρ ≥ 0.927). This study provides new insight into using a full range of actual disease severity versus limited ranges to ensure a realistic measure of rater accuracy and reliability, in addition to contributing to the ongoing debate on the use of visual disease estimates based on the 0-100% ratio scale for epidemiological research.

KeywordsSeptoria leaf blotch
ANZSRC Field of Research 2020300409. Crop and pasture protection (incl. pests, diseases and weeds)
Public Notes

Abstract only.

Institution of OriginUniversity of Southern Queensland
Byline AffiliationsUniversity of Liege, Belgium
Agriculture and Agri-Food, Canada
Luxembourg Institute of Science and Technology, Luxembourg
California Department of Food and Agriculture, United States
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El Jarroudi, Moussa, Kouadio, Louis, Beyer, Marco, Junk, Jurgen, Hoffmann, Lucien, Tychon, Bernard, Maraite, Henri, Bock, Clive H. and Delfosse, Philippe. 2015. "Economics of a decision–support system for managing the main fungal diseases of winter wheat in the Grand-Duchy of Luxembourg." Field Crops Research. 172, pp. 32-41. https://doi.org/10.1016/j.fcr.2014.11.012
Disease Severity Estimates-Effects of Rater Accuracy and Assessment Methods for Comparing Treatments
Bock, C. H., El Jarroudi, M., Kouadio, L. A., Mackels, C., Chiang, K.-S. and Delfosse, P.. 2015. "Disease Severity Estimates-Effects of Rater Accuracy and Assessment Methods for Comparing Treatments." Plant Disease. 99 (8), pp. 1104-1112. https://doi.org/10.1094/PDIS-09-14-0925-RE
Assessing the Performance of MODIS NDVI and EVI for Seasonal Crop Yield Forecasting at the Ecodistrict Scale
Kouadio, Louis, Newlands, Nathaniel K., Davidson, Andrew, Zhang, Yinsuo and Chipanshi, Aston. 2014. "Assessing the Performance of MODIS NDVI and EVI for Seasonal Crop Yield Forecasting at the Ecodistrict Scale." Remote Sensing. 6 (10), pp. 10193-10214. https://doi.org/10.3390/rs61010193
Brown rust disease control in winter wheat: II. Exploring the optimization of fungicide sprays through a decision support system
El Jarroudi, Moussa, Kouadio, Louis, Giraud, Frederic, Delfosse, Philippe and Tychon, Bernard. 2014. "Brown rust disease control in winter wheat: II. Exploring the optimization of fungicide sprays through a decision support system." Environmental Science and Pollution Research. 21 (7), pp. 4809-4818. https://doi.org/10.1007/s11356-014-2557-9
Brown rust disease control in winter wheat: I. Exploring an approach for disease progression based on night weather conditions
El Jarroudi, Moussa, Kouadio, Louis, Delfosse, Philippe and Tychon, Bernard. 2014. "Brown rust disease control in winter wheat: I. Exploring an approach for disease progression based on night weather conditions." Environmental Science and Pollution Research. 21 (7), pp. 4797-4808. https://doi.org/10.1007/s11356-013-2463-6
An integrated, probabilistic model for improved seasonal forecasting of agricultural crop yield under environmental uncertainty
Newlands, Nathaniel K., Zamar, David S., Kouadio, Louis A., Zhang, Yinsuo, Chipanshi, Aston, Potgieter, Andries, Toure, Souleymane and Hill, Harvey S. J.. 2014. "An integrated, probabilistic model for improved seasonal forecasting of agricultural crop yield under environmental uncertainty." Frontiers in Environmental Science. 2, pp. 1-21. https://doi.org/10.3389/fenvs.2014.00017
A comparison of raters and disease assessment methods for estimating disease severity for purposes of hypothesis testing
Bock, Clive, El Jarroudi, Moussa, Kouadio, Louis, Mackels, Christophe, Chiang, Kuo-Szu and Delfosse, Philippe. 2014. "A comparison of raters and disease assessment methods for estimating disease severity for purposes of hypothesis testing." Phytopathology: International Journal of the American Phytopathological Society. 104 (11), pp. 15-16.
Importance of a well-distributed frequency of measurements in the senescence monitoring of winter wheat and yield estimates
Kouadio, Louis, Djaby, Bakary, El Jarroudi, Moussa and Tychon, Bernard. 2012. "Importance of a well-distributed frequency of measurements in the senescence monitoring of winter wheat and yield estimates." Journal of Agricultural Science and Technology . 2 (12), pp. 1203-1213.
Estimating winter wheat yield through the decreasing phase of its green area [Cinetique de decroissance de la surface verte et estimation du rendement du ble d'hiver]
Kouadio, Amani Louis, Djaby, Bakary, Duveiller, Gregory, El Jarroudi, Moussa and Tychon, Bernard. 2012. "Estimating winter wheat yield through the decreasing phase of its green area [Cinetique de decroissance de la surface verte et estimation du rendement du ble d'hiver]." Biotechnology, Agronomy, Society and Environment. 16 (2), pp. 179-191.
Typology of the main fungal diseases affecting winter wheat in the Grand Duchy of Luxembourg
El Jarroudi, Moussa, Kouadio, Louis, Delfosse, Philippe, Giraud, Frederic, Junk, Jurgen, Hoffmann, Lucien, Maraite, Henri and Tychon, Bernard. 2012. "Typology of the main fungal diseases affecting winter wheat in the Grand Duchy of Luxembourg." Journal of Agricultural Science and Technology . 2 (12), pp. 1386-1399.
Spatial distribution of calibrated WOFOST parameters and their influence on the performances of a regional yield forecasting system
Djaby, Bakary, de Wit, Allard, Kouadio, Louis, El Jarroudi, Moussa and Tychon, Bernard. 2013. "Spatial distribution of calibrated WOFOST parameters and their influence on the performances of a regional yield forecasting system." Sustainable Agriculture Research. 2 (4), pp. 12-29. https://doi.org/10.5539/sar.v2n4p12
Profitability of using warning system for foliar disease of wheat in the Grand-Duchy of Luxembourg
El Jarroudi, M., Kouadio, L., Beyer, M., Tychon, B. and Delfosse, P.. 2013. "Profitability of using warning system for foliar disease of wheat in the Grand-Duchy of Luxembourg." 2013 APS-MSA Joint Meeting. United States 10 - 14 Aug 2013 United States. American Phytopathological Society. https://doi.org/10.1094/PHYTO-103-6-S2.1