Phytophthora nicotianae var. parasitica water as the causal agent of leaf blight and crown rot of cordyline terminalis Kunth

• Published in: Journal of Tropical Plant Pathology (Philippines) Vol. 40; no. 1-2
• Main Authors: Orajay, J.I, Divinagracia, G.G, Bayot, O.N, Dizon, T.O.,Philippines Univ. Los Banos, College, Laguna (Philippines). Dept. of Plant Pathology
• Format: Journal Article
• Language: English
• Published: 01.01.2004
• Subjects: ANATOMIA DE LA PLANTA; ANATOMIE VEGETALE; BLIGHT; COPA; CORDYLINE FRUTICOSA; CROWN; CULTURAL METHODS; DEPERISSEMENT; FEUILLE; FILIPINAS; HOJAS; HOUPPIER; http://www.fao.org/aos/agrovoc#c_16172; http://www.fao.org/aos/agrovoc#c_27306; http://www.fao.org/aos/agrovoc#c_29762; http://www.fao.org/aos/agrovoc#c_37361; http://www.fao.org/aos/agrovoc#c_3852; http://www.fao.org/aos/agrovoc#c_4243; http://www.fao.org/aos/agrovoc#c_5783; http://www.fao.org/aos/agrovoc#c_5954; http://www.fao.org/aos/agrovoc#c_6667; http://www.fao.org/aos/agrovoc#c_957; INFECCION; INFECTION; LEAVES; METODOS DE CULTIVO; MODE DE CULTURE; PHILIPPINES; PHYTOPHTHORA NICOTIANAE; PLANT ANATOMY; PODREDUMBRES; POURRITURE; ROTS; TIZON
• ISSN: 0115-0804

This study was conducted to identify the causal organism of leaf blight and crown rot of Cordyline terminalis or ti plant, a potential export foliage ornamental crop. Infected leaves of C. terminalis `Lemon Lime', `Pink Top', and `Hawaiian Compacta' from nurseries of the Institute of Plant Breeding and Dept. of Horticulture in UPLB and from a farmer's field in Lucban, Quezon [Philippines], respectively were collected and the causal organism isolated using the modified tissue planting technique. Formation of sexual structures was induced by mating the isolates of V-8 juice agar blocks. Cultural and morphological characteristics like growth responses to particular incubation temperatures, mating reactions and morphology and measurements of the sexual and asexual structures were examined. Following the key to identification of species of Phytophthora, the three isolates were identified as Phytophthora nicotianae var. parasitica Water Csyn.P. parasitica Dast.). Furthermore, their heterothallic nature was also demonstrated. To our knowledge, this is the first report in the country about this species infecting ti plants.