disease_location_wetland
soaked
Root rot of pepper, spinach, pansy, tomato and several other crop and garden plants. The fungus, a facultatively necrotrophic plant pathogen, attacks seeds (pre-emergence disease) and/or seedlings (post-emergence damping off). Affected plants develop a generalised wilt which becomes progressively more severe. In pepper, seeds are attacked and black lesions develop on hypocotyls of the surviving seedlings, often extending to the bases of the cotyledons. In spinach, roots become covered in yellow to orange spots their tissues becoming soft and water-soaked. In pansies, the vascular cylinder develops a deep orange-reddish discoloration in which, in the early stages of infection, numerous oospores can be seen. Stem bases become extensively rotted and eventually the aerial organs collapse and shrivel. In tomato plants, rootlet tips become discoloured and die back.
Aphanomyces cladogamus
Aphanomyces cladogamus