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Early detection of basal stem rot disease (Ganoderma) in oil palms based on hyperspectral reflectance data using pattern recognition algorithms


Liaghat, Shohreh and Ehsani, Reza and Mansor, Shattri and Mohd Shafri, Helmi Zulhaidi and Meon, Sariah and Sankaran, Sindhuja and Azam, Siti H. M. N. (2014) Early detection of basal stem rot disease (Ganoderma) in oil palms based on hyperspectral reflectance data using pattern recognition algorithms. International Journal of Remote Sensing, 35 (10). pp. 3427-3439. ISSN 0143-1161; ESSN: 1366-5901


Basal stem rot (BSR) is a fatal fungal (Ganoderma) disease of oil palm plantations and has a significant impact on the production of palm oil in Malaysia. Because there is no effective treatment to control this disease, early detection of BSR is vital for sustainable disease management. The limitations of visual detection have led to an interest in the development of spectroscopically based detection techniques for rapid diagnosis of this disease. The aim of this work was to develop a procedure for early and accurate detection and differentiation of Ganoderma disease with different severities, based on spectral analysis and statistical models. Reflectance spectroscopy analysis ranging from the visible to near infrared region (325–1075 nm) was applied to analyse oil palm leaf samples of 47 healthy (G0), 55 slightly damaged (G1), 48 moderately damaged (G2), and 40 heavily damaged (G3) trees in order to detect and quantify Ganoderma disease at different levels of severity. Reflectance spectra were pre-processed, and principal component analysis (PCA) was performed on different pre-processed datasets including the raw dataset, first derivative, and second derivative datasets. The classification models: linear and quadratic discrimination analysis, k-nearest neighbour (kNN), and Naïve–Bayes were applied to PC scores for classifying four levels of stress in BSR-infected oil palm trees. The analysis showed that the kNN-based model predicted the disease with a high average overall classification accuracy of 97% with the second derivative dataset. Results confirmed the usefulness and efficiency of the spectrally based classification approach in rapid screening of BSR in oil palm.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Agriculture
Faculty of Engineering
DOI Number: https://doi.org/10.1080/01431161.2014.903353
Publisher: Taylor & Francis
Keywords: Basal stem rot disease (Ganoderma); Oil palm plantations
Depositing User: Nabilah Mustapa
Date Deposited: 05 Aug 2015 01:14
Last Modified: 01 Oct 2015 02:33
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1080/01431161.2014.903353
URI: http://psasir.upm.edu.my/id/eprint/37181
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