black root rot of carrot - alternaria radicina

agriculture alternaria and bed bio biologic biology black carota carrot closeup control danger dauci daucus disease diseased drop farming fence fertilizer food fungal fungi fungicide fungus garden gardener gardening green grow growing growth harvest home horticulture infection infest media microorganism mold mould nature organic pathogen pathology pest pesticide phytopathology plague plant problem protection radicina rain raised root rot science seedborne soil soilborne spores spot summer symptoms tip vegetable water watering wet yard