Insect of the Month - Strawberry bud/clipper weevil

 
  Hort Snacks - January 2017
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 Anthonomus signatus

Crops Affected: Strawberry

Life Cycle:

  • Dark reddish-brown weevil with long snout
  • Adults overwinter in fencerows & shelterbelts
  • Emerge in early spring (when 16°C) to feed on available plants
  • Punch hole in flower bud to feed
  • Females lay eggs in holes in flower bud
  • Move down the stem & clip flower stem to prevent bud from opening and exposing the larvae
  • Larvae develop within flower bud (3-4 weeks)
  • Adults from larvae, feed briefly & overwinter
  • 1 generation per year
Symptoms:
  • Obvious symptom = Clipped flower buds
  • Dead flower stems turn straw-coloured
  • Holes in flowers and petals
Clipper weevil adult
Clipper weevil larvae in blossom
Clipper weevil damage
Photo by NYSAES-Cornell
Photo by MAFRI
Photo by MAFRI

Monitoring:
  • Monitor fields in May when flower buds begin to develop
  • Look closest to woodlots, shelterbelts and field margins first
  • Sample 0.6 m of row in 5 locations in each field 2 times per week from pre-bloom onwards
  • Economic threshold = 13-20 clipped buds per metre of row
Management:
  • Minimize the amount of trash in & around fields during mid to late summer
  • Separate new plantings from infested plantings
  • Tillage of old fields immediately after harvest will reduce clipper populations by harming pupal stage
  • Some chemical products are registered for management of this pest. See pesticide labels for application instructions.
 
 
 
 
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For more information about the content of this document, contact Robert Spencer.
This information published to the web on January 3, 2017.