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: Leafrollers  


Two species of leafroller (LR) are common to the Pacific Northwest: Obliquebanded LR (Choristoneura rosaceana; OBLR) and Pandemis (Pandemis pyrusana). Both feed primarily on foliage, but fruit damage can occur when the foliage touches the fruit.


Figures 1&2: Severe early season feeding causes distortion of the fruit shape; often appears as latticelike scaring.


Figure 3: Late-season feeding by Pandemis produces shallow, discontinuous surface feeding or holes, often resembling codling moth stings.
Figure 4: Late-season feeding by OBLR may be deeper and more continuous than Pandemis injury.
Figure 5: Severe summer feeding damage. Webbing my be present in hole. Can look like codling moth holes without frass, but does not extend into the seed core.





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