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: Lenticel Breakdown   

Lenticel Breakdown

Lenticel breakdown is a physiological disorder affecting the surface of apples. Before the packing, there is little evidence of a problem; however, within a few days of packing, symptoms appear as dark brown pits in the fruit skin around the lenticels, reducing marketable yield. It usually occurs on the less sun-exposed side and along color margins. Early symptoms appear as small dimples. As firmness decreases, pits grow in size and depth. The flesh is not deeply affected except for a possible cavity directly under the pits. Lenticel breakdown is easily confused with lenticel blotch pit. A dye uptake test has been developed to help determine fruit susceptibility to this disorder at harvest.

Figure 1: Gala apple showing moderate lenticel breakdown symptoms.


For information about orchard control of Lenticel Breakdown, refer to Dr. Kupferman's LB letter



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