Tree Fruit Research & Extension Center

Cullage Assessment & Education

Quick Identification Guide to Apple Postharvest Defects & Disorders

Physiological Disorders

The Physiological Disorders section of the card set includes most the common disorders of physiological origins found during the sorting and packing of Washington apples. Bitter pit, scalds and lenticel conditions are just a few of the items presented in this section. At a later date more cards may be developed for this section which would include any emerging or reclassified disorders. 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.



PHYSIOLOGICAL: Internal Breakdown   

Internal Breakdown

Overmature and large fruit are highly susceptible to Internal Breakdown. Internal breakdown is characterized by flesh browning and breakdown. Internal symptoms may be restricted to one side of the fruit, or involve the entire fruit. Often there is a 1/4th inch ring of healthy flesh surrounding the affected tissue. The sun-exposed side or the calyx end is more often affected, with the rest of the fruit normal. The skin of affected fruits may be normal, or dull and dark, and in later stages of the disorder, it sometimes becomes cracked.

Figure 1: Overmature Granny Smith apple with extensive internal breakdown with only slight bruiselike discoloration on one side of the outer skin (right side).





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