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Quantifying Lygus (Hemiptera: Miridae) damage in faba bean (Fabaceae) seeds using shortwave-infrared imaging

Published online by Cambridge University Press:  18 June 2019

A.M. Smith*
Affiliation:
Agriculture and Agri-Food Canada, Science and Technology Branch, Lethbridge Research and Development Centre, 5403 1st Avenue South, Lethbridge, Alberta, T1J 4B1, Canada
B. Rivard
Affiliation:
Department of Earth and Atmospheric Sciences, 2-063 Centennial Centre for Interdisciplinary Science, University of Alberta, Edmonton, Alberta, T6G 2E3, Canada
J. Feng
Affiliation:
Department of Earth and Atmospheric Sciences, 2-063 Centennial Centre for Interdisciplinary Science, University of Alberta, Edmonton, Alberta, T6G 2E3, Canada
H.A. Carcamo
Affiliation:
Agriculture and Agri-Food Canada, Science and Technology Branch, Lethbridge Research and Development Centre, 5403 1st Avenue South, Lethbridge, Alberta, T1J 4B1, Canada
*
1Corresponding author (e-mail: anne.smith@canada.ca)

Abstract

Lygus Hahn (Hemiptera: Miridae) feeding in faba beans (Vicia faba Linnaeus (Fabaceae)) often results in a reduction in seed quality and economic losses. Traditionally, seed damage is assessed subjectively through visual examination by a trained individual, but the use of non-destructive imaging to evaluate seed quality is gaining momentum. The focus of this study was to determine the ability to quantify Lygus species damage in faba bean using shortwave-infrared imaging and two analysis techniques: (1) spectral angle mapper and (2) simple reflectance indices. Seed samples were visually assessed for damage before imaging in 242 wavebands between 980 and 2500 nm. Four spectral intervals, involving 102 wavebands, were identified as optimal for the detection of seed damage using spectral angle mapper. A strong relationship was obtained between the area of seed damage derived using spectral angle mapper and visually (R2 = 0.95). Seed damage derived by thresholding of two normalised faba bean damage indices involving reflectance at 1086 and 1313 nm and 2218 and 2342 nm also showed a strong relationship with the visual assessment (R2 = 0.92). The two image analysis techniques provided similar results. The study suggests that imaging in the shortwave-infrared wavelengths and the derivation of simple indices can effectively quantify faba bean damage by Lygus feeding.

Type
Physiology, Biochemistry, Development, and Genetics
Creative Commons
Parts of this are a work of Her Majesty the Queen in Right of Canada.
Copyright
© Entomological Society of Canada 2019

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Footnotes

Subject Editor: Suzanne Blatt

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