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IPM Scouting in Woody Landscape Plants

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Black vine weevil - Otiorhynchus sulcatus
IPM scouing in woody landscape plants > black vine weevil
These snout beetles overwinter in the soil as early instar grubs, or as adults. Look for feeding by over- wintering adults as Viburnum opulus or Weigela are blooming. Look for over-wintering larvae to emerge as adults as Hydrangea arborescens ‘Grandiflora’ or ‘Annebelle’ are blooming. Adult weevils (all female) lay eggs for extended periods during the summer.Larvae and pupae of black vine weevil are found in the soil. Larvae cause serious injury by feeding on the bark of roots and stems. Foliage of plants injured by weevil larvae may turn brown or die suddenly.

Hosts: Azalea, rhododendron, euonymus, hemlock and yew.

Management: Management is usually targeted toward adults. Contact your Extension agent for recommendations.
Black vine weevil
10 mm long
Black vine weevil larvae Leaf notching caused by adult weevils
Larvae are 9 mm long Typical leaf notching caused by adult weevils feeding on foliage.
Additional information
This information was developed from A Pocket IPM Scouting Guide for Woody Landscape Plants by Diane Brown-Rytlewski. Purchase this in a pocket-sized guide for reference in the orchard from MSU Extension (publication E-2839).
The MSU IPM Program maintains this site as an access point to pest management information at MSU. The IPM Program is administered within the Department of Entomology, fueled by research from the Michigan Agricultural Experiment Station, delivered to citizens through MSU Extension, and proud to be a part of Project GREEEN.
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Updated 10/08/07