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Napa County UCCE
University of California
Napa County UCCE

European Grapevine Moth

Latest information on European Grapevine Moth for Napa County: Biology, monitoring and management

Issue Articles Type Date Added
Pre-Harvest Meetings--Napa County

The Napa County Agricultural Commissioner has scheduled pre-harvest meetings to discuss  the European grapevine moth program. 

Wednesday, August 6 at 3:00 pm, Tucker Farm Center

Thursday, August 7 at 2:00 pm, Rutherford Grange

Tuesday, August 12 at 9:00 am, UC Cooperative Extension meeting room

They have applied for 1.0 continuing education unit ("other" category). 

Content will be the same at all meetings, so you need to attend only one. 

RSVP's are not required.

PDF 7/8/14
Detection in Sonoma County, California

On July 2, 2014, we received the following report from CDFA:

The Sonoma County Agricultural Commissioner, in cooperation with the United States Department of Agriculture (USDA) and the California Department of Food and Agriculture (CDFA), announces the detection of a single male European Grapevine Moth (EGVM, Lobesia botrana) in the western portion of Sonoma County, near Cazadero.   The moth was identified on Thursday, June 26th in a trap from a vineyard.  

In response to the detection, agricultural officials immediately deployed delimitation traps at the rate of 100 traps per square mile.  A visual survey for EGVM eggs and larvae has been conducted and the results are negative.  The grower has been contacted. 

A single detection does not trigger a quarantine; however, if additional EGVM are detected within 3 miles of the original detection, a quarantine will be declared around the finds.  This area of Sonoma County has had no previous EGVM detections.  The closest previous detections of EGVM were over 20 miles away.  Agricultural officials are investigating this isolated EGVM detection.

Information on identification and management of L. botrana can be found on the UC Cooperative Extension websites for Sonoma and Napa Counties. Growers are encouraged to remain vigilant in scouting efforts, and practice sanitation and management practices in accordance with established quarantine and management programs. 

PDF 7/3/14
Tarp/slack-fill requirements relaxed for grapes transported within Napa County
A request to relax the tarping/slack-filling requirements for the transport of bulk wine grapes moving within Napa County has been granted by CDFA and USDA and is being implemented as a pilot program for the 2013 harvest. Haulers who wish to take advantage of this pilot program are required to complete the exhibit and file a copy with the Napa County Agricultural Commissioner’s Office. This exhibit specifies that:
 
Only haulers transporting grapes within Napa County can conduct normal filling of trailers, conveyances and containers; and
Grapes grown within the EGVM Quarantine area of Napa County that are being transported to other counties must continue to be tarped or slack filled; and
PDF 9/3/13
2nd generation treatment timing for Napa County

There are 11,550 EGVM traps deployed in Napa County. 

34 moths were captured during the 1st flight. 

To date, 2 moths of the 2nd flight have been captured.  

For the warmer regions of Napa (i.e; north of Oak Knoll): 

If you will be treating with a LARVICIDE/OVICIDE product, then applications can be made starting the week of June 17. If you will be treating with a LARVICIDE only product, then applications can be made starting the week of June 24. 

For the cooler regions of Napa:

If you will be treating with a LARVICIDE/OVICIDE product, then applications can be made starting the week of June 24. If you will be treating with a LARVICIDE only product, then applications can be made starting the week of July 1. 

Products with short residuals may require multiple applications during the hatch period. If you are in an area that is being treated with mating disruption in 2013 and you have not yet deployed dispensers, try to deploy them as soon as possible since the 2nd flight is very short. Insecticides should also be used in areas that are being treated with MD. 

 

PDF 6/11/13
A reminder for Napa County growers regarding grape shipments

If you plan to ship winegrapes out of California or out of the country, you must notify the Napa County Agricultural Commissioner’s Office.  Certain time sensitive regulatory requirements must be met prior to such shipments occurring, including removal of mating disruption, and trapping and inspection by Ag Commissioner staff.  If you don’t meet the required time frames for shipping, grapes will need to be fumigated or shipped as must.  If you plan to sell grapes through a broker going out of state, the grower is still required to contact the Ag Commissioner prior to shipping fruit.   

If you plan to ship out of California or the United States, please contact Agricultural Biologist Greg Music: greg.music@countyofnapa.org or (707)253-4357.  Thanks for your cooperation.

PDF 8/17/12
Insecticide Treatments for 2nd generation and Harvest Guidelines

As of July 4, 2012, we have accumulated 1594 DDF in Oakville, CA. This is the appropriate time to apply insecticides targeting larvae of the 2nd generation in the regions of Napa that are similar in climate to Oakville. Growers using organic products should make two applications, at 7-10 day intervals. 

As of July 4, 2012, we have accumulated 1341 DDF in Carneros, CA. We should reach 1400 DDF next week. Products with ovicide-larvicide activity can be applied after we reach 1400 DDF (projected next week), in Carneros and other cooler regions of Napa. Products with larvicide activity only should not be applied until we have reached 1550 DDF

The Napa County Agricultural Commissioner would like to remind you of the importance of sanitation during the harvest season to minimize the risk of transporting Lobesia. Follow the newsletter link below to read about best practices for this harvest season. 

PDF 7/5/12
Insecticide treatments targeting the 2nd generation

As of June 20, 2012, we have accumulated 1410 DDF in Oakville and 1180 DDF in Carneros. For areas other than Oakville and Carneros, please refer to the Table of Degree-Day Accumulations for Selected Locations in California.  

What this means for areas of Napa with climate similar to Oakville: 

If you are using an insecticide with ovicide and larvicide activity (such as Intrepid and Altacor), treatments can begin the week of June 24. 

If you are using an insecticide with larvicide activity only (such as organic products and conventional products other than Intrepid and Altacor), we must accumulate at least 1550 DDF before treating. We project this will be during the 1st week of July. 

What this means for areas of Napa with climate similar to Carneros:

If you are using an insecticide with ovicide and larvicide activity (such as Intrepid and Altacor), treatments can begin once we have accumulated 1400 DDF. We project this threshold will be reached in approximately 2 weeks. 

If you are using an insecticide with larvicide activity only (such as organic products and conventional products other than Intrepid and Altacor), treatments can begin once we have reached 1550 DDF. 

 

PDF 6/21/12
Treatment timing for 2nd generation Lobesia botrana in California

Products with ovicide and larvicide activity (Intrepid and Altacor) should be applied after we have reached 1400 DDF (from January 1).

Products with only larvicidal activity should be applied after we have accumulated 1550 DDF (from January 1). Growers using organic products should expect to make 2 applications during the 2nd generation, at a 7 day interval.

In the warmer areas of Napa County, we expect to reach 1400 DDF during the week of June 25. Cooler regions could be 7-10 days behind.

As of June 10, we have accumulated 1029 DDF and 1230 DDF for Carneros and Oakville, respectively. We will post weekly updates of DDF accumulations for Carneros and Oakville.

If you have weather data from Calistoga, Pope Valley, or any other regions in Napa that differ from Oakville and Carneros, and are willing to share, we can use that information to make more accurate predictions about treatment timing for those regions.

Calculations used to determine treatment timing for 2nd generation: Lower and upper development thresholds are 50ºF (10ºC) and 86ºF (30ºC), respectively. Start date for degree day accumulations: January 1, 2012.

Heat unit accumulations from the literature (for the 1st and 2nd generations): 306 DDF = egg hatch to pupation                                                           234 DDF = pupa development to adult                          &nb

PDF 6/11/12
Monitoring Update

We found 2, 1st instar larvae on Monday, 14-May. 

Of the eggs that we found, 19% had already hatched, 19% were ready to hatch (black cap), and 41% were in the yellow stage. 

This is the time to be treating for the 1st generation of Lobesia in Napa.  

PDF 5/15/12
Monitoring and Treatment Report

It is time to treat for 1st generation Lobesia larvae in Napa County. Treatments should be applied between now and May 26.

A Napa Napa County trap deployed between Apr 24 and May 8 caught a total of 33 moths, confirming that peak of the 1st flight occurred towards the end of April. 

On May 9, we detected 66 eggs; 47% of these eggs were in the yellow stage, roughly mid-way through their development. Of the remaining eggs, 33% were white, 12% orange, and 8% black cap. We also found one larva (1st instar). This confirms that treatments will be effective if applied during the next 2 weeks. 

Please submit your Pesticide Use Reports for mating disruption by today's deadline. This critical information is used in many ways, and is of special interest to members of the Technical Working Group, who deliberate and make recommendations about the Lobesia program in California. As a member of the TWG, I can assure you that we do use this information, so please take a moment to provide it. 

 

PDF 5/10/12
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