Comparison of Visual and Multispectral Radiometric Disease Evaluations of Cercospora Leaf Spot of Sugar Beet

Plant Disease
K SteddomC M Rush

Abstract

Visual assessments of disease severity are currently the industry standard for quantification of the necrosis caused by Cercospora beticola on sugar beet (Beta vulgaris) leaves. We compared the precision, reproducibility, and sensitivity of a multispectral radiometer to visual disease assessments. Individual wavebands from the radiometer, as well as vegetative indices calculated from the individual wavebands, were compared with visual disease estimates from two raters at each of two research sites. Visual assessments and radiometric measurements were partially repeated immediately after the first assessment at each site. Precision, as measured by reduced coefficients of variation, was improved for all vegetative indices and individual waveband radiometric measures compared with visual assessments. Visual assessments, near-infrared singlewaveband reflectance values, and four of the six vegetative indices had high treatment F values, suggesting greater sensitivity at discriminating disease severity levels. Reproducibility, as measured by a test-retest method, was high for visual assessments, single-waveband reflectance at 810 nm, and several of the vegetative indices. The use of radiometric methods has the potential to increase t...Continue Reading

References

Oct 24, 2008·Phytopathology·K SteddomC M Rush
Jan 1, 1995·Annual Review of Phytopathology·H Nilsson
Jul 1, 1998·Plant Disease·Carol E WindelsTom Knudsen

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Citations

Sep 1, 2017·Plant Disease·Sarah J PethybridgeJulie R Kikkert
May 23, 2019·Frontiers in Plant Science·Alexander LoladzeMaruthi Prasanna Boddupalli
Apr 1, 2012·Plant Disease·Gregory J ReynoldsSoizik Laguette
Sep 4, 2018·Frontiers in Plant Science·Kang YuAndreas Hund
Dec 15, 2020·Plant Phenomics : a Science Partner Journal·S JayF Baret

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