Tree Fruit Research & Extension Center

Cullage Assessment & Education

Quick Identification Guide to Apple Postharvest Defects & Disorders Cards

Mechanical & Field Injury

The Mechanical & Field Injury section of the card set includes many of the injuries that occur to applesprior to harvest. This includes problems such as bruising and weather induced defects, except sunburn, which is covered in the Fruit Finish 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.

 

 

MECHANICAL/FIELD INJURY: Frost  

frost damage

Frost is a serious problem both early in the season and late season. Frost occurring around blossom or fruit set can cause complete fruit loss. Late-season frost affects mostly late season varieties, leaving the affected fruit with a characteristic ring russet scar from where the frost settled on the fruit. It can be confused with the russetting caused by powdery mildew. However, mildew russet is more netlike across the fruit.

Figure 1: Late-season frost damage appearing as a pale red russet band around the lower half of Red Delicious fruit.

frost injury

Figure 2: Golden Delicious with late-season frost damage visible as a brown russet band around the center of the fruit.

 

 

 

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