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Root Borers

Root borerRoot BorersRoot borer damage

Hosts:  cherry, peach


Biology:
  Prionus root borer (right) and ten-lined June beetle grubs feed on roots and crowns of cherry and peach.   They can be a problem in sandy soils.


Symptoms:
  General tree decline with few other above ground symptoms.  Extensive feeding throughout roots and within wood.


Monitoring:
  Research is underway to develop a lure for monitoring prionus beetle adults.


Treatment Threshold:
  No threshold determined.


Degree Day Model:
  None


Management Considerations:
  Soil application of a systemic insecticide may be an effective treatment.  Currently, imidacloprid (systemic) is only labeled on apple and pear.  Check the insecticide label to be sure the fruit crop is listed before use. 

Entomopathogenic nematodes and fungi can be effective on June beetle larvae. 

Mass trapping with a pheromone lure can help to reduce Prionus populations.