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Root Weevils

Root weevil damageRoot weevil

Hosts:  all fruit trees


Biology:
  The adults are hard, rounded beetles with pronounced “snouts;” active at night.  Adults feed on foliage and the small, white legless larvae feed on roots and crowns.


Symptoms/Damage:
  Semi-circular notches at leaf edges; reduced tree vigor and increased drought stress.


Monitoring:
  Check for leaf damage in summer.


Treatment Threshold:
  No threshold determined.


Degree Day Model:
  None


Management Considerations:
  The best timing for suppression is in the spring and early summer when leaf-notching injury first appears, and again in the late summer to early fall to target larvae before winter.  Many insecticides can kill adults; entomopathogenic nematodes and fungi applied to the soil by the roots can kill larvae.