How to Manage Pests

Pests in Gardens and Landscapes

Timed insecticide treatments

A persistent insecticide may be applied to foliage to control black vine weevil adults, but monitor weevil populations beginning early in the spring before spraying. If you can tolerate some foliage damage, do not spray until 3 or 4 weeks after first detecting feeding damage or weevils; few if any weevils will have laid eggs before then because snout beetles must feed for about a month before they start laying eggs. If adult feeding cannot be tolerated, spray about a week after first detecting adults or damage. The most effective time to make a single application to foliage is as soon as your regular sampling for adults indicates that weevil populations have peaked and begun to decline. If weevil emergence is prolonged, a second foliar spray may be warranted about 3 to 4 weeks after the first application.

Adult black vine weevil
Adult black vine weevil


Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2014 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/GARDEN/PLANTS/INVERT/blvinweetreat.html revised: April 25, 2014. Contact webmaster.