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
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Agriculture and Natural Resources, University of California

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