Design of Vegetation Index for Identifying the Mosaic Virus in Sugarcane Plantation: A Brazilian Case Study

Author:

Moriya Érika Akemi Saito1,Imai Nilton Nobuhiro1ORCID,Tommaselli Antonio Maria Garcia1ORCID,Honkavaara Eija2ORCID,Rosalen David Luciano3ORCID

Affiliation:

1. Department of Cartography, São Paulo State University UNESP, Presidente Prudente 19060-900, Brazil

2. Department of Remote Sensing and Photogrammetry, Finnish Geospatial Research Institute, National Land Survey of Finland, 02150 Espoo, Finland

3. Department of Engineering and Mathematical Sciences, São Paulo State University, Jaboticabal 14884-900, Brazil

Abstract

Phytosanitary control of crops requires the rapid mapping of diseases to enable management attention. This study aimed to evaluate the potential of vegetation indices for the detection of sugarcane mosaic disease. Spectral indices were applied to hyperspectral images collected by an unmanned aerial vehicle (UAV) to find the areas affected by the mosaic virus in sugarcane. Identifying indices capable of detecting diseased plants in agricultural crops supports data processing and the development of efficient tools. A new index was designed based on spectral regions, which presents higher differences between healthy and mosaic virus-infected leaves to enhance hyperspectral image pixels representing diseased plants. Based on the data generated, we propose the anthocyanin red edge index (AREI) for mosaic virus detection in sugarcane plantations. An index that can adequately identify sugarcane infected by the mosaic virus may incorporate wavelengths associated with variations in leaf pigment concentrations as well as changes in leaf structure. The indices that assessed to detect plants infected with the sugarcane mosaic virus were the normalised difference vegetation index (NDVI), normalised difference vegetation index red edge (NDVI705), new vegetation index (NVI), ARI2 and AREI. The results showed that AREI presented the best performance for the detection of mosaic in sugarcane from UAV images, giving an overall accuracy of 0.94, a kappa coefficient of 0.87, and omission and inclusion errors of 2.86% and 10.52%, respectively. The results show the importance of wavelengths associated with the concentration of chlorophyll and anthocyanin and the position of the red edge for the detection of diseases in sugarcane.

Funder

São Paulo Research Foundation

National Council for Scientific and Technological Development

Brazilian Federal Agency for Support and Evaluation of Graduate Education

Foundation for Unesp development

Publisher

MDPI AG

Subject

Agronomy and Crop Science

Reference78 articles.

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