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: Watercore   

Watercore

Watercore appears as water-soaked areas of the flesh first associated with vascular bundles. In severe cases, the affected tissue may spread, covering large areas of the flesh. In these instances, watercore is externally visible by the appearance of translucent skin blotches on lighter pigmented apples, or as very dark patches on darker fruit. In mild cases, watercore will disappear (sugar reabsorbed) early on during cold storage. However, if severe enough, watercore may develop into internal breakdown (watercore breakdown).

Figure 1: A Granny Smith apple showing the clear skin blotches on the slice, exposing the water-soaked flesh beneath.

Figure 2: When the fruit is cut crosswise, a pinwheel pattern of water-soaked flesh is exposed. In severe cases, the tissue will turn brown as it breaks down and decays.

Watercore

 

 

 

 

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