noun
: any of several diseases of plants marked by reddish stripes or streaks: as
a. : a decay of timber caused by a pore fungus ( Polyporus vaporarius ) and characterized by red or brown streaks
b. : a disease of sugarcane caused by a bacterium ( Xanthomonas rubrilineans ) and characterized by long narrow dark red streaks on the leaves of young plants and later invasion of the vascular system with occasional top rotting