Practical Winery
65 Mitchell Blvd, San Rafael, CA 94903
phone: 415-453-9700 ext 102
email: Office@practicalwinery.com
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MARCH/APRIL 2010
GRAPEGROWING
World distribution of L. botrana
 
Figure 1. World distribution of L. botrana adapted from Distribution Maps of Pests (CIE 1974), with additions of findings reported later.
Movement of fruit, personnel, and machinery, as well as natural dispersal and the climatic suitability of various regions of California, make this pest a serious threat to other areas of the state.
Following its detection, a coalition of agencies the U.S. Department of Agriculture, California Department of Food and Agriculture (CDFA), and Napa County Agricultural Commissioner deployed 248 pheromonebaited traps in Napa County to aid in delimiting L. botrana populations. These traps were monitored from October 7 to October 26, 2009, during which time six male moths were collected. The low number is presumably the result of the population age (lateinstar larvae to overwintering pupae) when the traps were deployed.
BY
Lucia G. Varela,
Rhonda J. Smith,
Monica L. Cooper,
Richard W. Hoenisch,
University of California
E
uropean grapevine moth, Lobesia botrana, has recently been found for the first time in the United States. This moth belongs to the family Tortricidae. Unlike other tortricid moths that are grapevine pests, such as the orange tortrix (Argyrotaenia franciscana) and omnivorous leafroller (Platynota stultana), European grapevine moth larvae do not roll or feed on leaves they feed on flower parts and inside the berries.
In Europe this moth also has the common names berry and vine moth; these names are shared with similar species worldwide including the eastern U.S. It is important to verify the scientific name L. botrana when searching the literature for information on this pest.
Situation in Napa County
In mid-September 2009, the first report of the European grapevine moth in North America was confirmed in Napa County, CA. Based on available data at the end of 2009, geographic distribution within the state of California (at press time) is considered to be limited to
Napa County. The greatest number of confirmed specimens has been collected in the Oakville and Rutherford American Viticultural Areas, although an isolated population has also been located east of the town of Napa.
European grapevine moth female photo Jack Kelly Clark, courtesy of UC Statewide IPM Program
European grapevine larva with dark border on rear edge of prothoracic shield photo Jack Kelly Clark, courtesy of UC Statewide IPM Program.
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