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Foot rot of black pepper (Piper nigrum L.) caused by Phytophthora capsici Leonian occurs yearly on black pepper plantations in the Dominican Republic. To understand the microbiological conditions in the plantations important for disease control, fungal flora associated with roots and fruits were analyzed in a preliminary study8). Twelve isolates of four Pythium species were collected, and using methods by previous workers4,5), were identified as P. deliense Meurs, P. intermedium de Bary, and P. splendens Braun. One species was not identified. The three identified species are pathogens of various plants such as kidney beans against P. deliense6), P. intermedium against cucumber7) and melon against P. splendens9). Because they have been isolated occasionally from collapsed black pepper vines during this study, pathogenicity of the representative isolates of each species was then tested on black pepper seedlings. Isolates were collected from four locations including the Exhibition Farms of CENDETECA (Centro Nacional de Desarrollo Tecnologico de Cacao) in the Dominican Republic. They are three isolates of P. splendens [isolate SP7, K4(=ATCC200560), PyLM], and one isolate each of P. deliense [K6(=ATCC200559)], P. intermedium [K5(=ATCC200569)] and Pythium sp. (SP5); four isolates of Mortierella spp. (SP6, K8, K9, K10) and two Phytophthora isolates [Phy. capsici (A16) and a Phytophthora sp. (HPS2)]. The last two genera served as controls. The morphology, identification and pathogenicity of both Phytophthora and Pythium spp. were described by Matsuda et al. in 19943) and Watanabe et al. in 19968). Potted soils were artificially infested by mixing minced 5-day-old cultures grown on carrot juice agar (decoction of 200g of fresh carrot roots, glucose 20g, agar 20g, distilled water 11) with potted soils (500g potted soil/plate culture). Healthy seedlings were transplanted to artificially

Root Rots of Black Pepper Caused by Pythium splendens in the Dominican Republic.