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: Humidity Disorders   

high humidity cracking

Excess or too low humidity can have a detrimental effect on fruit during storage. If the humidity is too high, the cells swell and expand to the point where the tissue cracks. Too low humidity causes dehydration of the tissues leading to shriveling.

Figure 1: A Golden Delicious apple showing cracking at the lenticels. If conditions are severe enough, the cracks will expand, resulting in large, deep, branching cracks extending across the fruit. Often the cracks will become infected, and the fruit will decay.

Figure 2: The Gala shown here was stored at too low relative humidity and became shriveled.

low humidity shriveling

 

 

 

 

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