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.

Greasy spot

Scientific Name

[Fungus] Mycosphaerella citri Whiteside

Anamorph Stenella citri-grisea (F.E.Fisher) Sivanesan; (syn. Cercospora citri-grisea Fisher)

Other common names 

Greasy spot rind blotch

 

Disease cycle 

The major source of inoculum for greasy spot are wind-dispersed sexual spores (ascospores) produced during periods of wetness on decomposing fallen leaves. The disease cycle of this pathogen is unusual because most of the infection occurs on mature leaves. In areas with high temperature and high rainfall the disease cycle continues year round and infection may occur at any time.

 

 

Symptoms 

Leaf - foliar symptoms first appear as yellow spots on the upper leaf surface, with a corresponding slightly raised, pale orange to yellowish brown blister on the lower surface. Later the symptoms on both surfaces become darker brown or black and show a more 'greasy' appearance.

Fruit - fruit exhibit necrotic specks in the epidermis between the oil glands.

Host range 

Greasy spot affects all commercial citrus cultivars. It is most severe on grapefruit, lemon, tangelos and early season sweet oranges.

The fruits and leaves of grapefruit are highly susceptible.

Greasy spot is also known to affect the leaves of other rutaceous genera closely related to citrus, such as Aeglopsis, Fortunella, Murraya, and Poncirus.

Distribution 

Greasy spot is found in parts of Asia, Central and South America, the Caribbean, Texas, and Florida.

Other Mycosphaerella spp. have been found in California, Australia, and the Mediterranean, but do not cause greasy spot symptoms.

Easily confused with 

Citrus varigated chlorosis (CVC)

Greasy spot foliar lesions can be differentiated from CVC based on their distribution on the whole tree and individual leaves. CVC symptoms will be restricted to a single branch while Greasy spot symptoms will be throughout the tree and grove. On leaves CVC "lesions" will be interveinal while greasy spot lesions are numerous and random.

I hope you found this page about Greasy spot 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.