Root rot of carrot
dark brown to black, moist, mostly circular spots 0.5 -1.2 cm diameter that extend only to 2 mm in the root, up to 20-25 per carrot root. They occur h [...] Rhexocercosporidium infection can cause loss of seedlings. The subsurface parts turn dark brown to black, while the cotyledons remain green. During humid [...] fungus sporulates on root, leaf, and petiole lesions. Continuous light is best for in vitro sporulation. Spore germination in vitro requires free water