phytophthora cajani phytophthora cajani phytophthora cajani is a species of water mould that infects pigeon pea (cajanus cajan). it was first described in 1978. phytophthora cajani scientific classification kingdom: chromista phylum: oomycota order: peronosporales family: peronosporaceae genus: phytophthora species: p. cajani binomial name phytophthora cajanik.s. amin, baldev & f.j. williams 1978