- Caused by the fungus Elsinoe fawcettii
- Found on fruit, leaves and twigs
- Deforms leaves
- Wart like symptoms
- Light tan in color
- Affects grapefruit, Temples, Murcotts, tangelos, and some other tangerine hybrids
- http://www.crec.ifas.ufl.edu/extension/canker/mistaken.shtml
- If leaves from the previous season are heavily infected by citrus scab, 3 applications of Copper Fungicide
should be scheduled to control this disease. The first spray should be applied at about 1/4 expansion of the spring flush leaves, the second at petal fall, and the third about 3 weeks later. Fruit becomes resistant to scab about 2-3 months after petal fall. On tangelos and Murcott, Alternaria brown spot and scab occur together.
- http://edis.ifas.ufl.edu/hs141
- Temple orange most susceptable
- Spray new leaves
- Fruit sometimes stays green
- Peel can overgrow scab
- Mongi Zekri Ph.d UF/IFAS 5-County Agent
- [Depending on spore variety, they are] spread by splashing rain and perish as soon as they dry, or they remain viable for a short time and are dispersed by wind for short distances
- http://idtools.org/id/citrus/diseases/factsheet.php?name=Citrus+scab
Citrus Scab Disease on Fruit
Raised scab lesions on mature Temple fruit.
http://edis.ifas.ufl.edu/ch014
Raised scab pustules on young grapefruit.
http://edis.ifas.ufl.edu/ch014
Flatter scab lesions on mature grapefruit.
http://edis.ifas.ufl.edu/ch014
Citrus Scab Disease on Leaves
Raised conical lesions of citrus scab on grapefruit leaves with conical depressions on the opposite side.
edis.ifas.ufl.edu/ch014
Tangerine leaf severely affected by scab.
edis.ifas.ufl.edu/ch014
Resources
http://www.crec.ifas.ufl.edu/extension/fungal/citrus_scab.shtml
http://www.crec.ifas.ufl.edu/extension/canker/mistaken.shtml
http://edis.ifas.ufl.edu/hs141
http://idtools.org/id/citrus/diseases/factsheet.php?name=Citrus+scab
http://edis.ifas.ufl.edu/ch014
