Rigidoporus lignosus (Klotzsch) Imaz commonly called white
root rot is the pathogen most feared by planters throughout
the rubber-growing regions of the world (Rao 1975; Nandris
et al. 1983) except in India (Jayasinghe 2010). White root rot is
a silent killer, their above ground symptoms are produced
once the roots are fully damaged. Presently it is spreading at