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Citrus Health Response Program |
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Sweet Orange Scab
On July 23, 2010, the U.S. Department of Agriculture’s (USDA) Animal and Plant Health Inspection Service (APHIS) confirmed the detection of a fungal disease of citrus caused by Elsinoë australis (Bitancourt & Jenkins) on residential citrus trees in Texas. This was the first confirmation of E. australis, commonly referred to as sweet orange scab, in the United States. Since that detection, APHIS has confirmed the disease on citrus trees in several other U.S. States. This plant disease does not pose a threat to human or animal health. Sweet orange scab causes unsightly, scab-like lesions to develop on fruit rinds and, less often, on leaves and twigs of Citrus spp. and Fortunella spp.. The damage produced is superficial and does not affect internal fruit quality or taste. Infected fruit are more likely to drop prematurely, and the scabby lesions reduce the fruit’s fresh market value. In addition, the disease may stunt young citrus seedlings. The disease is also known to occur in South America (Argentina, Bolivia, Brazil, Ecuador, Paraguay and Uruguay) and in Oceania (Cook Islands, Fiji, Niue and Samoa).
News and Information
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APHIS Allows the Movement of Fruit Regulated for Sweet Orange Scab to Commercial Citrus-Producing States Under Certain Conditions (4/2/13) (PDF; 47 Kb)
- APHIS Revises Approved Packinghouse Procedures for Sweet Orange Scab (Elsinoë australis) (8/19/11) (PDF; 17 Kb)
- APHIS Adds Conditions to Allow Fruit Movement into or through States Regulated for Sweet Orange Scab (Elsinoë australis) (4/18/11) (PDF; 52 Kb)
- APHIS Revises Federal Order for Sweet Orange Scab (3/23/11) (PDF; 78 Kb)
- Quarantine Areas Established for Sweet Orange Scab (Elsinoë australis) (PDF; 112 Kb)
- Risk Assessment
- Technical Working Group
- Technical Working Group (TWG) Report Sweet Orange Scab (Elsinöe australis), August 2010 (PDF; 131 Kb)
- Technical Working Group (TWG) Report Sweet Orange Scab (Elsinöe australis), August 2010 (PDF; 131 Kb)
Scientific Information
- Pest Not Known to Occur in the United States or of Limited Distribution, No. 29: Sweet Orange Scab - USDA-APHIS-PPQ-BASS (PDF; 619 Kb)
- Sweet Orange Fruit Scab Caused by Elsinoë australis - A. A. Bitancourt & A. E. Jenkins - 1937 Journal of Agricultural Research Vol 54(1):1-18 (PDF; 4 Mb)
- Sweet Orange Scab - Plant Pathology Circular No. 228 - Florida Department of Agriculture & Consumer Services
- Data Sheets for Quarantine Pests: Elsinoë fawcetti and Elsinoë australis - CABI and EPPO
- Sweet Orange Fruit Scab - Pest & Disease Identification Library - Australia Plant Biosecurity
Survey
- Detection and Delimitation Survey Methods for Elsinöe australis (Sweet Orange Scab of Citrus) (PDF; 1.07 Mb)
- Field Identification Guide for Sweet Orange Scab (Elsinöe australis) (PDF; 936 Kb)
- PPQ Presentation: Exotic Pest Alert - Elsinoe australis - Sweet Orange Scab Symptom Recognition Training (PDF; 750 Kb)
- Potentially Actionable Suspect Sample (PASS) Federal Confirmation in PPQ General Policy (PDF; 180 Kb)
Other Citrus Diseases
Report a Pest
To report a pest, please visit to APHIS web site at: Report a Pest
