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Green Apple Aphid

 

green apple aphid

Hosts:  apple


Biology:
  Overwinter as eggs in protected areas on limbs and start hatching at half-inch green. Green apple aphids remain on apples all season.


Symptoms:
  Curled leaves; honeydew.


Monitoring: 
Look for shiny black eggs in early spring. If aphids are a problem later in the season, start after petal fall and select a random shoot on the major cultivar in the block and count the number of leaves that have one or more wingless aphids; repeat on 10-20 more shoots, and determine an average number leaves/shoot that have aphids.


Treatment Threshold:
  Delayed dormant oil will usually take care of this aphid. Otherwise, 4+ leaves/shoot infested with aphids during the season will require treatment.


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.