Detection of bacterial wilt infection caused by Ralstonia solanacearum in potato (Solanum tuberosum L.) through multifractal analysis applied to remotely sensed data |
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| Authors: | Perla Chávez Christian Yarlequé Hildo Loayza Víctor Mares Paola Hancco Sylvie Priou María del Pilar Márquez Adolfo Posadas Percy Zorogastúa Jaume Flexas Roberto Quiroz |
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| Institution: | 1. Crop Management and Production Systems Division, International Potato Center, Av. La Molina 1895, Lima 12, Peru
2. Research Group in Biology of Plants Under Mediterranean Conditions, University of Balearic Islands, Crtra. Valldemossa km.7.5, 07122, Palma de Mallorca, Spain
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| Abstract: | Potato bacterial wilt, caused by the bacterium Ralstonia solanacearum race 3 biovar 2 (R3bv2), affects potato production in several regions in the world. The disease becomes visually detectable when extensive damage to the crop has already occurred. Two greenhouse experiments were conducted to test the capability of a remote sensing diagnostic method supported by multispectral and multifractal analyses of the light reflectance signal, to detect physiological and morphological changes in plants caused by the infection. The analysis was carried out using the Wavelet Transform Modulus Maxima (WTMM) combined with the Multifractal (MF) analysis to assess the variability of high-resolution temporal and spatial signals and the conservative properties of the processes across temporal and spatial scales. The multispectral signal, enhanced by multifractal analysis, detected both symptomatic and latently infected plants, matching the results of ELISA laboratory assessment in 100 and 82%, respectively. Although the multispectral method provided no earlier detection than the visual assessment on symptomatic plants, the former was able to detect asymptomatic latent infection, showing a great potential as a monitoring tool for the control of bacterial wilt in potato crops. Applied to precision agriculture, this capability of the remote sensing diagnostic methodology would provide a more efficient control of the disease through an early and full spatial assessment of the health status of the crop and the prevention of spreading the disease. |
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