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: Carbon Dioxide Injury   

Carbon Dioxide Burning

If the carbon dioxide (CO2) level is too high during controlled atmosphere (CA) storage, both external and internal injury symptoms may occur. External injury resembles snowflakelike patches which may join to form one very large patch. Internal symptoms appear as discolored areas within the vascular bundles. The tissue may be brown and develop pockets. A noticeable aroma of fermentation may be present when CA storage is opened, or the fruit is cut.

Figure 1: A Golden Delicious apple with external CO2 injury showing irregular (snowflakelike) margins.

Figure 2: Internal CO2 damage with brown flesh and pockets.

Carbon Dioxide Burning





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