Worldwide distribution. On passionfruit, cultivated and wild. Note, this is the same fungus that causes a similar disease on tomato (root rot, and a firm dark fruit rot; seeFact Sheet no. 157), and also attacks capsicum, citrus (see Fact Sheet no. 264), papaya (see Fact Sheet no. 152), pineapple, and tobacco.
A water mould, an oomycete, not a fungus.
A blight of young leaves, brown spots on older ones, rots on fruits and vines; root decay causing wilts.
Spread by rain splash from spores in the soil; long distance spread is on wind-driven rain, and perhaps on nursery plants.
Cultural control: yellow variety rootstocks with graft 30 cm above soil; avoid planting in poorly drained land; prune to aid air circulation and drying; grass barriers to stop rain-splash; collect trash and burn after harvest.
Chemical control: copper or mancozeb (protectants); or phosphorous acid (systemic).