[1][2] Septoria lycopersici infects the tomato leaves via the stomata and also by direct penetration of epidermal cells.

[3] Symptoms generally include circular or angular lesions most commonly found on the older, lower leaves of the plant.

When the lesions become numerous often the leaves turn yellow, then brown, shriveling up and eventually dropping off the plant altogether.

This can be accomplished by burning or destroying all infected plant tissues to prevent the spread of the primary innoculum.

Improving air circulation around the plants through separation of rows and use of cages can also promote faster drying and reduction of splashing, thus reducing the spread of fungal spores.