Etiology and Control of Seedling Blight of Brassaia actinophylla Caused by Pythium splendens in Hawaii. B. T. Yamamoto, Research Assistant, Department of Plant Pathology, University of Hawaii, Honolulu 96822. M. Aragaki, Plant Pathologist, Department of Plant Pathology, University of Hawaii, Honolulu 96822. Plant Dis. 67:396-399. Accepted for publication 10 September 1982. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-396.

Phythium splendens was consistently associated with grayish water-soaked lesions on seeding hypocotyls of Brassaia actinophylla. Six isolates of P. splendens from brassaia and single isolates from schefflera, anthurium, and papaya caused preemergence and postemergence damping-off of brassaia seedlings. Chlorotic leaves and reduced growth rates were symptoms of both root rot and stem canker on inoculated 4-mo-old plants. Metalyxyl at 25 ppm a.i. and etridiazole at 500 ppm a.i. were effective in controlling the disease. Metalaxyl at 500 ppm a.i. and etridiazole at 1,000 ppm a.i. or higher were phytotoxic.