Skip to main content

Rosy Apple Aphid

 

rosy apple aphidsdeformed apples

Hosts:  apple


Biology:
  Overwinter as eggs in protected areas on limbs and start hatching at half-inch green.  Migrate to alternate weed hosts during summer.


Symptoms:
  Curled leaves; honeydew; saliva of rosy apple aphid is toxic to fruit cells, resulting in deformed fruit.


Monitoring:
  Look for shiny black eggs in early spring.  Starting at open cluster stage, examine at least 10 trees, spending 3 minutes/tree, and look for colonies.


Treatment Threshold:
  Delayed dormant oil will usually take care of this aphid.  Otherwise, an average of more than one colony per tree may result in fruit injury.


Degree Day Model:
  none


Management Considerations:
  Numerous beneficial insects including lady beetle adults and larvae, lacewing larvae, and syrphid fly larvae help suppress aphid populations.