Septoria Lycopersici

Fungal Disease

Septoria Lycopersici

Fungal Disease

Septoria Lycopersici

Fungal Disease

Septoria Lycopersici

Fungal Disease

Septoria leaf spot usually appears on the lower leaves after the first fruit sets. Spots are circular, about 1/16 to 1/4 inch in diameter with dark brown margins and tan to gray centers with small black fruiting structures. Characteristically, there are many spots per leaf. This disease spreads upwards from oldest to youngest growth. If leaf lesions are numerous, the leaves turn slightly yellow, then brown, and then wither. Fruit infection is rare.

Long periods of high relative humidity, temperatures of 15–26^oC, and leaf wetness are ideal conditions for the development and spread of the pathogen.

Image Source: Missouri Botanical Garden, Nancy Gregory, University of Delaware, Bugwood.org, Bruce Watt, University of Maine, Bugwood.org.