Tree Fruit Research & Extension Center

Cullage Assessment & Education

Quick Identification Guide to Apple Postharvest Defects & Disorders Cards

Fruit Finish

The Fruit Finish section of the card set includes sun and heat induced disorders found in Washington apples. This includes sunburn browning, sunburn necrosis and photo-oxidative sunburn (previously refered to as Type III sunburn). 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.



FRUIT FINISH: Sunburn Necrosis   

Sunburn Necrosis

Sunburn necrosis is heat-induced while the fruit is on the tree. Like sunburn browning, it occurs on the sun-exposed part of the fruit, but UV-B is not a major factor. When the fruit surface temperature exceeds 126 degrees F for as little as 10 minutes, skin cell death occurs, resulting in a dark brown or black (necrotic) spot that appears later. Cracking of the affected area is common.

Figure 1: Sunburn necrosis on Granny Smith.

Figure 2: Sunburn necrosis on Red Delicious.

Figure 3: Sunburn necrosis on Gala.

Sunburn Necrosis
Sunburn Necrosis  




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