While para rubber trees originated in Brazil, they have suffered devastating damage there by a disease called SALB (South American Leaf Blight) in the early 20th century and they have hardly been planted in Brazil since then.
In Southeast Asia where over 90% of the world’s para rubber tree plantations are concentrated now, the damage caused by the white root rot disease (*1) is getting worse. As traditional diagnosis of the disease relies on visual inspection of under-soil roots, there has been a high risk of late detection and false diagnosis, which results in the spread of the disease.
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