Meaning of Java black rot

Ja'va black' rot"

Pronunciation: [key]
— Plant Pathol. Plant Pathol.
  1. a disease of stored sweet potatoes, characterized by dry rot of and black protuberances on the tubers, caused by a fungus, Diplodia tubericola.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.