Diseases Commonly Mistaken for Citrus Canker

Citrus Canker

 

Citrus Scab

  • 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

     Additional Information
  • Florida Citrus Pest Management Guide: Citrus Scab PDF
  • A Guide to Citrus Disease Identification PDF
  • Your Florida Dooryard Citrus Guide - Common Pests, Diseases, and Disorders of Dooryard Citrus PDF
  • Citrus Scab PDF
  • Quick Reference Guide to Foliar Fungicides PDF
Scab on leaves
Citrus scab on fruit



Citrus Melanose

  • Caused by the fungus Diaporthe citri
  • Found on fruit and leaves
  • Feels like sandpaper
  • Red-brown in color
  • Grapefruit is very susceptible but all citrus may be affected

     Additional Information
  • Florida Citrus Pest Management Guide: Melanose PDF
  • A Guide to Citrus Disease Identification PDF
  • Your Florida Dooryard Citrus Guide - Common Pests, Diseases, and Disorders of Dooryard Citrus PDF
  • Melanose PDF
  • Quick Reference Guide to Foliar Fungicides PDF
Scab on leaves
Citrus scab on fruit

Alternaria Brown Spot

  • Caused by the fungus Alternaria alternata
  • Found on young fruit, leaves and twigs
  • Brown to black spots surrounded by a yellow halo
  • Affects Dancy tangerines, Minneola tangelos, Murcotts, Orlando tangelo, Nova tangelo, Lee tangelo and Sunburst tangerine
  • Does not affect oranges; may affect grapefruit if located next to highly infected tangelos or tangerines

     Additional Information
  • Florida Citrus Pest Management Guide: Alternaria Brown Spot PDF
  • Alternaria Brown Spot PDF
  • Quick Reference Guide to Foliar Fungicides PDF
Scab on leaves
Citrus scab on fruit

Citrus Bacterial Spot (CBS)

  • Caused by bacterium Xanthomonas axonopodis pv. citrumelo
  • Occurs in nursersies
  • Does not survive in commercial groves
Scab on leaves

Anthracnose

  • Caused by the fungus Colletotrichum gloeosporioides
  • Primarily affects fruit
  • Tangerines are especially susceptible
  • Occurs primarily as a postharvest disease

     Additional Information
  • Anthracnose PDF
Scab on leaves

Greasy Spot

  • Caused by the fungus Mycosphaerella citri
  • Looks like drops of oil
  • Can be found on fruit or leaves
  • Most severe on grapefruit leaves, Pineapple oranges, Hamlins and tangelos

     Additional Information
  • Florida Pest Management Guide: Greasy Spot PDF
  • Greasy Spot PDF
  • A Guide to Citrus Disease Identification PDF
  • Your Florida Dooryard Citrus Guide - Common Pests, Diseases, and Disorders of Dooryard Citrus PDF
  • Quick Reference Guide to Foliar Fungicides PDF
Scab on leaves
Scab on leaves