Root rot of carrot
mycelium can develop on the surface. Initially, the disease forms circular to irregular spots on the leaves that vary in colour from grey to almost black [...] and the air. The fungus develops at temperatures ranging from -3°C to 25°C, with an optimum around 18°C. Lesions are dark brown to black, moist, mostly circular [...] germination in nonsterile soil was proportional to the proximity to carrot rootlets. Conidia on leaflets produced a germ tube, an appressorium and an infection