Greasy Spot
Pathogen
- Caused by the fungus Zasmidium citri-griseum
Leaf Symptoms
- Initial yellow mottle pattern with reddish-brown blisters on the underside of the leaf
- As the leaf ages, the lesions become darker brown with a greasy look
- The yellow disappears and badly affected leaves will drop
Fruit Symptoms
- Symptoms appear as specks on rind between oil glands
- Lesions start pink but become brown or black 3-6 months after infection
Varieties Affected
- All citrus
- Most severe on grapefruit leaves, Pineapple oranges, Hamlin and tangelos
Learn more: A Guide to Citrus Disease Identification
Management
- Commercial grove management practices are reviewed and updated annually in the Florida Citrus Production Guide.
- The Quick Reference Guide to Foliar Fungicides is updated annually and available as a downloadable PDF.
- The Citrus Copper Application Scheduler is a tool available to assist in scheduling copper applications based on current copper residue levels.
