Citrus Arborist b 480-969-8808 Warner has been treating sick trees in Mesa AZ. for over 50 years. If you look to the left there are links to our other web sites. There is also a link to our YouTube channel. So if you live in Mesa AZ. or the surrounding areas give us a call. Thanks..


Tree service for Citrus tree diseases in Mesa Az.



Scientific Name

[Fungus] Septoria citri Pass.

Other common names 

Septoria spot

Disease cycle 

Septoria has saprophytic capabilities and pycnidia often form on dead twigs and leaves. Conidia from these pycnidia are spread by splashing water and may infect leaves and fruit. However, symptoms may not result for up to six months after infection.




Leaf - foliar lesions are blister-like, raised, black and 1-4 mm in diameter. Over time the center of the lesions become necrotic and pale brown. Pycnidia develop in the lesions especially following leaf drop when the lesion turns dark brown with dark margins. When conditions are favorable, the disease may cause severe leaf drop in the lower portion of the tree.

Fruit - early fruit lesions are small light tan to reddish brown pits 1-2 mm in diameter that extend no deeper than the flavedo. Older lesions are darker sunken 20-30 mm in diameter. Dark fruiting bodies, pycnidia, may develop in these lesions. Lesions may appear in the form of "tear stains" patterns. Spots are more evident on ripe fruit.

Host range 

All citrus cultivar are susceptible. However, Valencia oranges, Navel oranges, lemons and grapefruit are frequently damaged.


This disease has been reported from most citrus producing areas throughout the world.

I hope you found this page about Septoria useful. If you have any questions about Tree Disease please contact our Tree Service to schedule an appointment. We have been treating sick trees for over 50 years. We currently serve, Mesa AZ, Gilbert AZ, Chandler AZ, Scottsdale, Phoenix AZ and all of Maricopa County AZ.

We currently serve - Mesa Az. – Gilbert Az. - Tempe Az. - Chandler Az. - Queen Creek Az. - Scottsdale Az. – Paradise Valley Az. - East Phoenix Az.