Isolation and Identification of the Pathogen Causing Phytophthora Blight of Pachira macrocarpa Isolation and Identification of the Pathogen Causing Phytophthora Blight of Pachira macrocarpa Elicitation of the Hypersensitive Responses in Tabacco by a10.6 kD Proteinaceous Elicitor from Phytophthora palmi