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UC Cooperative Extension Ventura County
669 County Square Dr. Suite 100
Ventura CA 93003
Phone: 805.645.1451
Fax: 805.645.1474

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Our offices are currently closed due to the COVID-19 pandemic, and our team is telecommuting from home. We are available via phone and email. 

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Black Vine Weevil


Black vine weevil, Otiorhynchus sulcatus, the larvae of this insect feed on the roots and basal stems. Black vine weevils and their young feed on a wide variety of shrubs including privet, euonymous, azaleas, rhododendron, taxus, citrus, and other evergreens. High grub populations can severely stunt these plants by root feeding and may cause death. Where populations are small, no control is recommended. However, if populations build up, a soil drench and basal plant spray will help reduce the population and improve plant vigor. There are other causes of plant decline, so check for diseases and other insects (scale) as well before making a final diagnosis