Wines & Vines Home
   
 
Welcome Guest
LOGIN |  CREATE ACCOUNT
 
ADVERTISEMENT
 
 
 
08.13.2014  
 

Napa Moth Eradication Cost Near $90 Million

County launches new trapping program for five new pests

 
by Paul Franson
 
 
greg clark napa
 
Napa County agricultural commissioner Greg Clark announces a program placing sentinel traps for pests known to damage grapevines.

Napa, Calif.—The Agricultural Commissioner’s office in Napa County has launched a sentinel program to gain an early warning if five potential grape pests show up in the county.

Ag commissioner Greg Clark announced that his department is targeting serious pests of wine grapes not known to be established in California. “Placing a base level of traps throughout Napa County provides the opportunity to detect infestations of new pests early, before they become widespread throughout the county.”

The importance of the sentinel trapping is clear. “Prior to 2009, the European grapevine moth (Lobesia botrana) was not known to be established in North America. With its discovery in Napa County in 2009, and 10 additional California counties, a multi-million-dollar federal quarantine program was established.”

He added, “Since 2010, Napa County growers have spent approximately $45 million in treatment and quarantine costs in the EGVM (European grapevine moth) eradication effort. Early detection of serious wine grape pests could potentially save millions of dollars in government and grower resources.”

Humberto Izquierdo, assistant agricultural commissioner for the County of Napa, estimated that local, state and federal governments have spent an additional $45 million to $50 million on trapping and quarantine compliance for EGVM.

The pests selected for the program were identified by reviewing information from the USDA Grape Commodity-based Survey Guidelines, the Cooperative Agricultural Pest Survey (CAPS) for grapes, USDA’s Tortricids of Agricultural Importance and by consulting with CDFA, USDA and international authorities on grape pests.

The pests identified for the trapping program are:

Honeydew moth (Cryptoblabes gnidiella) is distributed throughout Asia, Africa, Europe (including France and Italy), South America (Brazil and Uruguay) and Hawaii. The larvae feed on the stems when fruit is green, causing wilt and berry fall. Feeding in ripe berries can cause juice leakage and secondary rot pathogens.

European grape berry moth (Eupoecilia ambiguella) is distributed throughout Asia, and Europe (including France, Italy and Spain). Larval damage is similar to damage caused by L. botrana. Flower buds, open flowers and young fruitlets can be destroyed as well as developing or mature grapes later in the season. Associated rots can also be an issue. EGVM and European grape berry moth are considered the two most serious wine grape pests in Europe.

Grape berry moth (Paralobesia viteana) is widespread in grapegrowing regions of eastern North America. Recently it has been reported in western Colorado vineyards. Grape berry moth is the primary lepidopteran grape pest in eastern North America. Females lay eggs on individual grapes, blossoms and stems. Larvae of the first generation feed on blossoms or small berries, often webbing together entire clusters. Larvae of subsequent generations tunnel into the berries and feed inside, also webbing together clusters.

Grape tortrix moth (Argyrotaenia ljungiana) is considered a pest of fruit and field crops and ornamentals in southern Europe and the European part of the former USSR. It has been recorded damaging a variety of plants, with most economic losses occurring in apples, grapes and tea. Early instar larvae skeletonize the underside of leaves along the midrib. Later instars roll or fold leaves and may also feed on buds and fruits.

Brown marmorated stink bug (Halyomorpha halys) is a potentially serious pest to wine grapes and wine quality. Brown marmorated stink bug (BMSB) was introduced to the Eastern United States in the mid-1990s and has since spread to various regions of the country. It has been reported in Southern California since 2005. In 2013, a large population was found in central Sacramento, Calif., as well as smaller infestations in Yuba City, Calif., (Sutter County) and Chico, Calif., (Butte County). The pest is known to spread by hitchhiking on household belongings that are moved across the country or around the state.

Approximately 350 traps will be deployed at the rate of one trap per square mile for each of the first four insects. Based on a review of pest life cycles, traps were put up in July and will be removed in October.

Traps for the brown marmorated stink bug will be placed around moving and storage companies, campgrounds and RV parks and larger wineries that receive the most visitors. For this initial BMSB trapping program, 40 traps sites will be selected throughout the county. Data will be shared with researchers from the state working on the infestations in Sacramento, Butte and Sutter counties.

Treatment history and cost
Martin Mochizuki, the EGVM grower liaison, summarized the treatments that have been applied to eradicate the European grapevine moth.

In the first years after discovery of the pests, more than 20,000 acres were treated with pesticides, and mating disruption was extensively used.

As trappings have dropped, however, the treatment areas have been shrinking, and for next year no mating disruption will be employed to avoid compromising the trapping program.

european grape vine moth
 

The spraying for EGVM in 2014 occurred within 500 meters from places where the bugs were found in 2012 and 2013. This involved approximately 3,000 acres with 80 growers. They sprayed for the first two generations and used isomate pheromones within 50 0 meters of the 2013 trapping sites.

The conventional vineyards received isomate pheromone for mating disruption by March 15, targeted within 500 meters of the 2013 findings.

One application of Intrepid or Altacor was applied at pre-bloom stage for the first generation of the bugs, then Intrepid or Altacor was used on the second generation using a degree-day model for timing for a total of two or three applications.

Organic vineyards required more sprays—a minimum of four or five sprayings.

As with conventional vineyards, isomate pheromones for mating disruption were set out by March 15 within 500 meters of the 2013 findings.

To fight the first generation, Bt or Entrust treatments were applied at the pre-bloom stage. Based on the residual impact, pest development and timing, two or more applications may be needed.

Bt or Entrust were applied by degree-day model for the second generation but two applications may be necessary.

Olive flowers at bloom, which can host the insects, were sprayed with Bt or Altacor at bloom time only.

Mochizuki summarized the cost of the control measures to growers:

napa vineyard pest program
 

He added that there was 100% compliance by growers in the treatment areas. Growers within 500 meters of the 2013 finds will need to treat again in 2015, but no isomate pheromones will be used in 2015.

If no EGVMs are found, the restrictions and treatments could end in 2016.

 

SHARE »
Close
 
Currently no comments posted for this article.
 
CURRENT NEWS INDEX »


 
Wines & Vines Home
 
866.453.9701 | 415.453.9700 | Fax: 415.453.2517
65 Mitchell Blvd., Ste. A San Rafael, CA 94903
info@winesandvines.com
Wine Industry Metrics
 
Off-Premise Sales » Month   12 Months  
November 2014 $708 million
5%
$7,844 million
6%
November 2013 $673 million $7,428 million
     
Direct-to-Consumer Shipments » Month   12 Months  
November 2014 $274 million
21%
$1,799 million
16%
November 2013 $225 million $1,558 million
     
Winery Job Index » Month   12 Months  
November 2014 127
-5%
226
15%
November 2013 134 196
     
 
MORE » Released on 12.15.2014
 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 

FEATURES
 

Practical Winery & Vineyard Library
 
Search the PWV archive »
 
 

Direct To Consumer
Wine Shipping Report
2014
 
Download full report »
 
 

CALENDAR
  • January 7
     
    Putting Your Brand to Work
     
  • January 9-18
     
    Icewine Festival
     
  • January 13-16
     
    VinCO
     
  • January 15
     
    WineFlavor 101B
     
  • MORE »
 

READER COMMENTS
 
Article: Grape Industry Lukewarm on Immigration Act »
 
A band-aid it may be but instead of the negative tone of this article which...
Reader: Guest
 
Article: Oregon Wine Institute Plans for the Future »
 
When Mark is involved, things are going to work out just great! We miss the...
Reader: Peter Bell
 
Article: Spanish Cooper Sells Chinese Oak »
 
I would love to find Us wineries using the Chinese oak barrels. Do you know...
Reader: Guest
 
Article: Prohibition Laws Linger 81 Years Later »
 
Trader Joe's (Union Square) and Whole Foods (Upper West Side) both have wine shops attached...
Reader: Guest
 
Article: Prohibition Laws Linger 81 Years Later »
 
Maybe the economy could use another boost by repealing the post-prohibitionary laws too. Make it...
Reader: csm noble
 
 


Directory/Buyer's Guide — Your Wine Industry Marketplace
 
 
WINERY SEARCH
 
 
Advanced Search »
SUPPLIER SEARCH
   by Product
 by Company Name or Brand
 
Browse by Category »
2015 Directory/Buyer's Guide
The Wines & Vines Directory and Buyer's Guide
 
 
EXPANDED ONLINE SEARCH INCLUDED WITH PURCHASE
 
ORDER NOW »
 
LEARN MORE »
 
 
Wines & Vines Magazine
 
 
LEARN MORE »
 
SUBSCRIBE »
 
Digital Edition Now Available!
Wines & Vines Digital Edition Now Available
 
LEARN MORE »
 
ORDER NOW »
 
 
The Wines & Vines Online Marketing System
 
The Industry Standard winery marketing application
 
FREE LIVE DEMO »
 
VIEW VIDEO »
 
 
 
 
Latest Job Listings
 Senior Vice President
 American Canyon, CA
General Administration and
 Administrative Assista...
 New York, NY
General Administration and
 Driver/Shipping And Re...
 Novato, CA
General Administration and
 Night Superintendent
 Ripon, CA
Winemaking and Production
 Tasting Room Sales -Fu...
 Calistoga, CA
DTC, Tasting Room and Retai
 Inventory Planning Ana...
 San Francisco, CA
General Administration and
 Sommelier - Fine Dinin...
 New York, NY
DTC, Tasting Room and Retai
 Career Opportunity Nat...
 United States, USA
Sales and Marketing
 Bottling Line Quality ...
 Geyserville, CA
Winemaking and Production
 Peninsula/San Francisc...
 Peninsula/Sf, CA
Sales and Marketing
 
More Job Listings >>
Follow Us On:
 
 





Home  |  About Us  |  Editors  |  Subscribe  |  Print Edition  |  Digital Edition

Advertise  |  Site Map  |  Contact Us  |  Privacy Policy
 
 
Copyright © 2001-2014 by Wine Communications Group, Inc. All Rights Reserved.
No material may be reproduced without written permission of the Publisher.
Wines&Vines does not assume any responsibility for any unsolicited manuscripts or materials.