The effect of soil amendment by brown, green and red seaweeds was studied in controlling the root rot infecting fungi of okra seedlings in the greenhouse. The soil amendment with seaweeds
Stokeyia indica
,
Padina pavonia
(brown),
Solieria robusta
(red), at 1% w/w reduced
Macrophomina phaseolina
,
Rhizoctonia solani
and
Fusarium solani
infection on okra roots.
Codium iyengarii
(green) at 0.5 % w/w was effective against
F. solani, while at 1% w/w was found phytotoxic.
S.robusta showed better control of
F. solani infection when used with
Pseudomonas aeruginosa
than either used alone. S. robusta produced better plant height and fresh weight of shoot than
P. aeruginosa. Results of the present study suggest that the use of brown seaweeds
S. indica and
P. pavonia alone and
S. robusta alone or in combination with
P. aeruginosa have great potential to control root-infecting fungi of okra with enhancement of plant growth. These seaweeds alone or in combination with
P. aeruginosa may be utilized as biological control of root infecting fungi of okra.
