Volume 23, 250

Tropical Grasslands (1989) Volume 23, 250–253

DAMPING-OFF OF STYLOSANTHES GUIANENSIS BY PYTHIUM IRREGULARE

A.B. GOULD¹ and R.M. SONODA ²

¹University of Florida, Agricultural Research and Education Center, Rt. 4, Box 4092, Monticello, FL 32344, USA.
²University of Florida, Agricultural Research and Education Center, P.O. Box 248, Ft. Pierce, FL 34954, USA

Abstract

Pythium irregulare Buisman was isolated from Stylosanthes guianensis seedlings showing symptoms of post-emergence damping-off in the greenhouse. Stylosanthes guinanenis seedlings inoculated with P. irregulare under aseptic conditions displayed tissue-browning, loss of turgor and tissue collapse. Seed treated with metalaxyl prior to planting in artificially infested soil had significantly less seedling losses to postemergence damping-off than untreated seed or seed treated with captan.