Quick Search Carrot Diseases Posted byglobaladmin February 17, 2020February 20, 2020 Leave a comment on Quick Search Carrot Diseases Credits: Biovision-Infonet Cottony soft rot Cottony soft rot (Sclerotinia sclerotiorum). Greyish, white mold forms at the base of stem. Black round structures appear as disease progresses. The disease can extend underground to the root.(c) David B. Langston, University of Georgia, Bugwood.org Leaf blight Leaf blight (Alternaria dauci). Small, irregular, black to purplish coloured spots. Spots may coalesce to cover the entire leaf.(c) David B. Langston, University of Georgia, Bugwood.org Powdery mildew Powdery mildew on carrot caused by Erysiphe heraclei (c) www.poljoberza.net Damping-off on carrot Damping-off on carrot (Phythium sp.)(c) David B. Langston, University of Georgia, www.bugwood.org Bacterial soft rot Bacterial soft rot caused by (Erwinia carotovora var. carotovora) on carrot(c) Oregon State University