Tree Fruit Research & Extension Center

Cullage Assessment & Education

Quick Identification Guide to Apple Postharvest Defects & Disorders

Postharvest Diseases

The Diseases section of the card set includes all the major fungal diseases found in stored Washington apples. This section also includes a Symptom Comparison Table to help. At a later date more cards may be developed for this section which would include any newly discovered pathogens. For ordering information visit the Order Information section of the Introduction. The cards shown on this site are slightly modified to accomodate web formatting. Figures may appear fragmented in some browsers. Please report viewing problems here. Any reproduction of the card images or content without permission is in violation of WSU Copyright policies.

Postscript:  Since the publication of this card set, a new fungal disease was discovered and identified, Phacidiopycnis washingtonensis, AKA Speck rot. This fungas has become a serious quarantine pest for some export markets, such as China. Dr. YK Kim and Dr. CL Xiao, both formerly of WSU, fully describe this disease in their paper found here. Although not found in the printed card set, we have included a description of this disease with the other fungal disease below.

 

 

DISEASES: Bull's Eye Rot  

Bull's Eye - GD side

Bull’s eye rot occurs on Pacific Northwest apples. In Washington State, Bull’s eye rot is more commonly seen on Golden Delicious, particularly on apples from orchards with perennial canker problems on trees. Bull’s eye rot also occurs in Europe and some other fruit-growing regions.

Figure 1: Bull’s eye rot on a Golden Delicious fruit; lesion is flat to slightly sunken, brown to dark brown with lighter brown to tan in the center, resembling a Bull’s eye.
Figure 2: Multiple Bull’s eye rot lesions on a Golden Delicious fruit.
Figure 3: Bull’s eye rot originating from infection at the calyx end of a Golden Delicious fruit.
Figure 4: Bull’s eye rot originating from infection at the stem-bowl area of a Golden Delicious fruit.

Bull's Eye - GD multi
Bull's Eye - stem Bull's Eye - calyx

Additional Resources A factsheet guide specifically about Bull's eye rot can be downloaded here.

 

 

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