Strawberry root weevil (Otiorhynchus ovatus) and others
Pest description and crop damage Larvae are cream-colored, C-shaped grubs that feed on roots, sometimes girdling them. Adults feed on Douglas-fir and true fir needles, resulting in characteristic notching.
Management-cultural control
Site preparation with fallow period prior to planting will reduce habitat for weevils.
Management-chemical control
Control typically targets adult feeding at emergence.
- acephate (Ace-Jet) (group 1B-organophosphate)
- azadirachtin (AzaDirect and others)-Some formulations are OMRI-listed for organic use.
- bifenthrin (OnyxPro, Sniper and others) (Group 3)-Restricted use pesticide. Some products not registered for use in Washington.
- dinotefuran (Safari 20 SG) (Group 4A)
- thiamethoxam (Flagship 25 WG) (Group 4A)