Black vine weevil

July 30, 2015

Otiorhynchus sulcatus

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.

Black vine weevil
Adults weevils are active at night, but can be detected during the day by laying down boards or using pitfall traps.

Look for overwintering 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.

Hosts

Azalea, rhododen dron, euonymus, hemlock and yew.

Black vine weevil larvae and puape
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.

Management

Management is usually targeted toward adults. Contact your Extension agent for recommendations.

Black vine weevil damage
Typical leaf notching caused by adult weevils feeding on foliage.

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Related Topic Areas

Integrated Pest Management

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