. Researchers have isolated many species of
fungi of black root rotfrom strawberries, but some are more
often involved than other. Rhizoctonia solani, R. fragraria,
Pythium spp. are all isolated frequently, often in various
combination [5,6]. Wilhelm and Nelson [7] stated their
belief that R. fragariae or its perfect stage, Ceratobastidium,
and P. ultimum were the ‘‘primary factor responsible’’ for
black root rot.Most ofthe fungi involved in black root rot are
weak parasites, living saprophytically in the soil and
becoming pathogenic only when strawberry roots are
stressed by a condition of water logging, low oxygen, or
root injury