Tree Fruit Research & Extension Center

Cullage Assessment & Education

Quick Identification Guide to Apple Postharvest Defects & Disorders Cards

Arthropod Damage

The Arthropod section of the card set includes all the major insect damage found in Washington apples. This section also includes some mite damage. At a later date more cards may be developed for this section which would include other forms of animal damage, such as, bird pecks and rodent feeding, as well as, any emerging or reclassified disorders. Click on the tab below for the pest damage you are interested in viewing. For ordering information visit the Order Information section of 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.



ARTHROPODS: True Bugs   

Lygus damage

There are three major Hemiptera (true bugs) that may cause feeding damage on apples: Lygus (Tarnished plant bug), stink bugs and Campylomma (Mullein plant bug).
Figure 1: Lygus damage is caused by feeding on flower parts or young fruit. Feeding kills cells preventing growth in the surrounding area. The resulting fruit is deformed with a deep pit sometimes called cat-facing.

stink bug vs bitter pit
campyloma damage, early

Figure 2: Stink bug feeding resembles bitter pit. This figure compares stink bug damage (left) to bitter pit (right). Stink bug feeding damage is more conical in shape, lighter in color, and less corky than bitter pit.
Figure 3 (below right): Stink bug usually feed on the top half of the fruit. Bitter pit usually is more towards the bottom portion.

campyloma damage, later

Figures 4&5: Campylomma feeds on mites and aphids. However, early in the season they may feed on flowers and developing fruit. Early in the season, feeding damage appears as one or more dark, raised, corky warts inside a shallow depression (Fig.5). As the fruit grows, damage appears as small, dark, raised spots (Fig. 4).

stink bug vs bitter pit external




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