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: Other Caterpillars  

caterpillar damage

Cutworm is a general term referring to noctuid caterpillars, such as fruitworms, cutworms, and armyworms. Normally they feed on weed hosts, but they may move freely between weeds and apple trees. Severe fruit damage can occur while they feed on leaves that are close to apples.
Figure 1: Surface feeding with decay.

Figure 2: Deep, narrow, scarred “bowl” made by a fruitworm.

Figure 3: Cutworm surface feeding “bowl” with scarring.

Figure 4: Frequently, cutworms stay at one spot, making a shallow bowl. When they leave, the hole scars and may crack over time.

fruitworm damage
deep cutworm damage   cutworm damage




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