Septoria is a genus of fungal plant pathogens in the phylum Ascomycota. They cause necrotic leaf spots on the leaves of their hosts, producing filiform or cylindrical conidia inside pycnidia embedded in the … · Septoria leaf spot is one of the most common garden diseases. Learn how to identify, treat, and prevent septoria in tomatoes and other plants. Septoria leaf spot is a fungal disease that affects a wide range of plants. It usually begins as small, water-soaked spots on the lower leaves of the plant and progresses into larger, circular lesions with a gray or … Because it is a fungal disease, it is spread by the spores of Septoria lycopersici, a fungus that hangs out on plant debris and weeds. It overwinters easily and is spread to individual plants when water splashes … How to Control Septoria Leaf Spot: Once septoria leaf spot appears in tomatoes, time is of the essence. Remove infected lower leaves to limit the spread to fruit-bearing branches. Septoria leaf spot is a prevalent fungal disease affecting a wide range of crops, such as tomatoes, lettuce, and parsley. This disease, caused by fungi in the Septoria genus, can cause significant yield losses if … Septoria Important diseases: Leaf spots on numerous plants, Purple leaf blotch. Septoria causes numerous leaf spot diseases on a wide variety of vegetables, field crops, forages, and ornamentals. It also causes … Septoria leaf spot Pathogen: Septoria spp. Hosts Include: Artemisia, Baptisia, Campanula, Chrysanthemum, Coreopsis, Delphinium, Dianthus, Echinacea, Gaillardia, Heuchera, Lamium, Lathyrus, … The most notorious species within the genus is Septoria lycopersici, which specifically targets tomato plants, causing Septoria leaf spot. Favorable conditions for septoria infections include high humidity … Septoria leaf spot is caused by a fungus, Septoria lycopersici. It is one of the most destructive diseases of tomato foliage and is particularly severe in areas where wet, humid weather persists for extended periods.