Apple collar rot
General Phytophthora cactorum is a plant pathogen that causes root rot, rhizome rot of strawberry, apple rot, apple collar rot and crown rot. It has an [...] range. Damage symptoms Phytophthora cactorum causes seedling damping off, a reduced root system and black discolouration of the roots. On the foot, dark [...] the plant surface and new sporangiophores (structures containing sporangia, a type of spores) with sporangia are formed, that protrude through the stomata