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.




Picking bruise

Bruises are the most common type of mechanical damage. Fruit can be bruised on the tree during hand thinning, or during picking. They can also be bruised by adjacent fruit or tree limbs. Once harvested, fruit bruise easily in the bins through rough handling. Loading fruit in the dump tank and running on packing line equipment can also bruise fruit. Although mostly considered a cosmetic downgrade, bruises can make fruit susceptible to rot.

Figure 1: This single bruise occurred at harvest.
Figure 2: Multiple bruises like this are common to thinning, where one fruit is held out of the way while removing another in a cluster.
Figure 3: Fruit can be bruised on tree by rubbing against other fruit or limbs.

thinning bruise
tree bruise






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