Vine Mealybug


Agricultural Commissioner Sealer of Weights and Measures

Greg Clark, Agricultural Commissioner Sealer of Weights and Measures

Vine Mealybug


The Ag Commissioner's Office conducts an enhanced vine mealybug (VMB) trapping program of 25 traps per square mile.  Countywide and regional maps are available to growers on this web page to aid them in identifying possible VMB infestations on their properties.  Vineyard site-specific maps are also available to growers on request.    


2015 VMB maps

Full County Overview



Soda Canyon 

Deer Park 

South Napa 

Mid Valley 

St Helena

North East Valley

 Wooden Valley 

North West Valley


Please note: Trapping was not conducted in Carneros in 2014 because the area is considered to be widely infested.

Historical data also available online. View Maps



Biological Control 

 VMB KillersAgricultural Commissioner's staff releases bio control agents, Anagyrus Wasps and Mealybug Destroyer, to help growers manage VMB populations.  These releases are funded by Napa County Pest & Disease Control District funds. 



Related Information:  

Napa County UCCE Vine Mealybug Page

Winery Vine Mealybug Guidelines

UC Davis IPM