Septoria lycopersici
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Author(s): Paul Bachi, University of Kentucky Research and Education Center
Source: IPM Images
Septoria lycopersici Speg. 1881
The fungus is a foliar pathogen of tomatoes and potatoes in the Americas and some other regions under conditions of high humidity. Two varieties, specialized on these 2 hosts have been described (see below). The fungus survives in plant residues and disperses mainly by rain splashes. Transmission by seeds is also suspected. In the leaf spots, several black pycnidia are formed, filled with filamentous conidia, around 50-100 µm long. No sexual stage is known. Control involves the use of fungicides and the removal of infected plant debris.
Septoria lycopersici var. lycopersici
The fungus infects the leaves and stems of tomatoes, causing round to elliptical spots, up to 5 mm large, with dark edges and a grey, later black center. Heavily infected leaves drop prematurely and the disease can result in yield losses.
| Vernacular names | |
|---|---|
| • Deutsch: | Blattfleckenkrankheit der Tomate |
| • English: | Septoria leaf spot of tomato |
Septoria lycopersici var. malagutii
Infects potatoes in the Americas. Small round and brownish spots are formed on the upper side of the leaves, with pronounced concentric ridges. In contrast to the tomato variety, the potato variety prefers low temperatures.
- Other images of Septoria lycopersici (IPM Images - click to enlarge)
symptoms on tomato
asexual spores
