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Learn More about Vineyard Mealybugs

Male Mealybug ID

Monitor VMB

Ants and MBs


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Vineyard Mealybugs in the North Coast Region

The three most important mealybugs (below) in the North Coast are vine mealybug (VMB), grape mealybug (GMB), and obscure mealybug (OMB). Gill's and long-tailed mealybug are present in other regions, but not prevalent in the north coast. Mealybugs can be found anywhere on the vine (trunks, cordons, leaves, etc.). They are phloem-feeders, and excrete honeydew. Excessive honeydew can lead to the growth of sooty mold that can soil leaves and clusters. All vineyard mealybugs transmit grapevine leafroll-associated viruses (GLRaV). Male mealybugs do NOT transmit GLRaV because they do not feed in the adult stage; as nymphs they are vectors.

More information: UCIPM: Vine mealybug, UCIPM: Mealybug identificationUCCE Napa County, UCCE Sonoma County

Information adapted from materials made by UCIPM, UCCE Napa, UCCE Sonoma, and Bettiga et al. 2013. Grape Pest Management. Third edition. University of California, Agriculture and Natural Resources, Richmond, CA, USA.

Video: M. Hobbs July2020

VMB population on grapevine trunk.

(A) Vine mealybug (Planococcus ficus)

(B) Grape mealybug (Pseudococcus maritimus)

Vine mealybug identification UCCE Napa County

Short caudal filaments

PC: Malcolm Hobbs

Grape mealybug identification UCCE Napa County

PC: Jack K. Clark

(C) Obscure mealybug (Pseudococcus viburni)

Obscure mealybug identification UCCE Napa County

PC: Kent Daane

Long tailed mealybug identification UCCE Napa County

PC: Jack K. Clark

Extremely long

caudal filaments

Figures A, B, C, D: the four common mealybugs and their defining characteristics relevant to the North Coast/ Central Coast region.

Click on the image to visit the UC IPM website for more details on management and identification.

(D) Long Tailed mealybug (Pseudococcus longispinus)

Identifying male mealybug in traps

Click on the photos for a downloadable copy of the identification sheets

Male Mealybug identification UCCE Napa County

Common features of male mealybugs

Male mealybug identification UCCE Napa County



Insects Commonly Confused with Male Mealybugs

These insects are commonly found in pheromone-baited traps for mealybugs.

Thrip vineyard UCCE Napa County
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Parasitic wasp vineyard UCCE Napa County
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Zoom Progression of Male Mealybugs in Traps
Monitoring for VMB
Vine Mealybug: detection & monitoring

Trap data collected through the Napa Pest and Disease Control District were used to indicate potential risk for spread of vine mealybug in Napa County

Click on map below to enlarge or read it in Spanish!

Vine mealybug monitoring and map of napa county UCCE Napa County

Male Vine Mealybug detections from 2012-2021 in Napa County


Map by: Sarah L. MacDonald

Dr. Monica Cooper's presentation on Vine Mealybug
Inspecting Green-Growing Vines for Vine Mealybug
Monitoring strategies for Vine Mealybug
Inspeccionando vides de crecimiento verde para el piojo harinoso
2022 Sustainable Vineyard Practices
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