Ground detection of Ganoderma basal stem rot disease in oil palms using electrical resistance tomography technology

GanoER tomography is a powerful tool for the diagnosis (detection) of oil palm trunk early decay/rotting due to Ganoderma disease, which can be used to establish an early control and management programme through Integrated Ganoderma Management (IGM). In both healthy (uninfected) and infected (mild and severe diseased) oil palm trunk by Ganoderma fungus, it was possible to calculate decay and non-decay stem tissues represented as a spectrum colour (black represent internal decay/rotting tissues or white represent non-decay tissues). It was evident that some oil palm trees were in earlier stages of Ganoderma infection while others were in more advanced stages, affecting the ER measurement. Based on ER values, detecting the percentage (%) of internal trunk decay/rotting using GanoER tomography was possible in monitoring the progress of decay/rotting in living standing oil palm trees. The ability to diagnose asymptomatic oil palm trees is a great advancement in disease management and not only will permit the reduction in Ganoderma inoculum by earlier eradication (by sanitation) of the affected oil palm trees but also will provide researchers/managers with tools to evaluate earlier management practices such as fungicide treatment or removal of the infected oil palm. This will help to increase oil palm yield and productivity by reducing losses due to Ganoderma disease.

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