Importance: Common and serious nursery pathogens, some species are exotic.
Symptoms: Phytophthora pathogens attack all parts of a plant including roots and crowns, fruit, leaves, stems, flowers and buds causing root rot, collar rot, tree canker, stem lesions, bud rot, heart rot, leaf blight, fruit rot, tuber and corm rot.
Common symptoms include rotting of roots, rotting of trunk at ground level, leaf yellowing and death, dieback, leaf drop, stunting of older plants, discolouration and wilting of the upper parts of the plant. May also cause seedling damping-off. Some species cause stem and foliage lesions.