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Narrowband vegetation indexes and detection of disease damage in soybeans

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3 Author(s)
Vigier, B.J. ; ECORC Centre, Agric. & Agri-Food Canada, Ottawa, Ont., Canada ; Pattey, E. ; Strachan, I.B.

A portable narrowband spectroradiometer was used to detect sclerotinia stem rot infection, caused by the fungus Sclerotinia sclerotiorum in soybeans. Increasing levels of fungal inoculum were used to cause a gradient of disease infection in the field. Canopy reflectance measured in narrowband R675-R685 and broadband R635-R685 could estimate 86% of the variation in soybean plants damage measured by a count of early dead plants. Plant damage was also associated with the chlorophyll absorption in reflectance and the normalized pigment chlorophyll vegetation indexes, showing a loss of chlorophyll pigment compared to healthy plants. A new field approach is suggested for the investigation of plant damage with narrowband spectroradiometry.

Published in:

Geoscience and Remote Sensing Letters, IEEE  (Volume:1 ,  Issue: 4 )