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Septoria lycopersici prefers warm, wet, and humid conditions. Disease development occurs within a wide range of temperatures; however, the optimal temperatures lie between 20 and 25 degrees Celsius. [4] High humidity and leaf wetness are also ideal for disease development. [2]
Septoria musiva, correct taxonomic name: Sphaerulina musiva (teleomorph: Mycosphaerella populorum), is an ascomycete fungus [1] responsible of a leaf spot and canker disease on poplar trees. It is native on the eastern cottonwood poplar Populus deltoides , causing only a leaf spot symptom.
Septoria leaf spot infects the blueberry plant through spores ejected from infected leaves and stem lesions left on the ground from the previous harvest season. These spores infect the crop and small white/tan leaf lesions form on the plant and the stem in early May.
Septoria are ascomycete pycnidia-producing fungi that cause numerous leaf spot diseases on field crops, forages and many vegetables including tomatoes which are known to contract Septoria musiva from nearby cottonwood trees, and is responsible for yield losses.
Septoria malagutii is a fungal plant pathogen infecting potatoes. [3] The casual fungal pathogen is a deuteromycete and therefore has no true sexual stage. As a result, Septoria produces pycnidia, an asexual flask shaped fruiting body, on the leaves of potato and other tuber-bearing spp. causing small black to brown necrotic lesions ranging in ...
There will be chlorotic spots on upper surfaces of leaves, masses of spores on lesions which resemble black mats on lower leaf surface, and necrotic spots on leaves [7]. The leaf spot has a unique grey to dark powdery appearance that can distinct it from septoria leafspot and ascochyta blight. The leaf withers as the spots join together.