Nibor D IGR 120x600

Pest Information

Obscure root weevil

Obscure root weevil

  • Latin Name: Sciopithes obscurus
  • Common Name: Obscure root weevil
  • Other Names: N/A

Pest Details

Obscure root weevil
Obscure root weevil
Obscure root weevil


This is a native species in the Pacific Northwest of the U.S.


Like many other ornamental weevils the females of this species create a small egg chamber by folding over the margin of a leaf, then depositing several eggs in that chamber. It feeds on a wide variety of ornamental and agricultural plants, the adults feeding on the foliage and the larvae feeding on the roots. They are a particular pest on rhododendrons in the Pacific Northwest, as well as on strawberries and in nurseries and greenhouses.


Adult beetles are from 5-7 mm long and cylindrical in appearance. They have a very short snout with the elbowed antennae arising near the end of the snout well in front of the eyes. They are an overall mottled brown color with a distinctive wavy darker band across the wing covers near the back end. Larvae are typical of root weevils and weevils in general in that they are white with dark heads, curved to a shallow ā€œCā€ shape, and without legs.

Characteristicts Important to Control:

Control with insecticides is aimed at killing the adult beetles, as the larvae are generally going to be in the soil. Contact insecticides applied to the foliage when adult beetles are present can be helpful.

Demand CS Veseris 728x90
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