New California Pest Quarantine Areas Declared

New detections of two pests – the European Grapevine Moth (EGVM) in the Lodi area and invasive melon fruit flies near Bakersfield – have caused the California Department of Food and Agriculture (CDFA) to declare new pest quarantine areas. The EGVM finds have led to an extension of the quarantine for the pest to San Joaquin County. Ninety-six square miles are now under quarantine there, bringing the total area under quarantine statewide to 1,995 square miles. To see a map of this quarantine area, or any other in the state, visit www.cdfa.ca.gov.

The quarantine primarily affects growers as well as those who harvest, transport and otherwise process or handle crops. These business people generally sign compliance agreements that indicate how crops, vehicles, equipment and related articles are to be treated during the quarantine.

Residents are also affected by the quarantine. Those who have grapes, stone fruit trees (peaches, plums, etc.) and other “host plants” for this pest in their yards are asked to harvest and consume their fruit on-site to further limit the risk of spreading the pest.

EGVM, or Lobesia botrana, is found in southern Asia, Japan, Europe, North Africa, Anatolia, the Caucasus and in South America. The pest primarily damages grapes, but has also been known to feed on other crops and plants.

The EGVM larvae, not the adult moths, are responsible for the damage to grapes. Larvae that emerge early in the spring feed on grape bud clusters or flowers and spin webbing around them before pupating inside the web or under a rolled leaf. If heavy flower damage occurs during this first generation, the affected flowers will fail to develop and yield will be reduced.

Second-generation larvae enter the grapes to feed before pupating in the clusters or in leaves. Larvae of the third generation – the most damaging – feed on multiple ripening grapes and expose them to further damage from fungal development and rot. These larvae overwinter as pupae in protected areas such as under bark, and emerge as adults the following spring.

The second quarantine announced Thursday measures 82 square miles and is in place in Kern County, where invasive melon fruit flies have been detected in the Arvin/Mettler area.

The movement of host fruits and plants grown in the quarantine areas is restricted. Residents living within the boundaries are asked not to move host plants and materials from their property.

“We don’t see the melon fruit fly in California as often as some as some other pests, but it is still very damaging,” said CDFA Secretary A.G. Kawamura. “This quarantine allows us to protect surrounding uninfested areas by preventing movement of the fruit fly.”

While fruit flies and other pests threaten California’s crops, the vast majority of them are detected in urban and suburban areas. The most common pathway for these pests to enter the state is by “hitchhiking” in fruits and vegetables brought back illegally by travelers as they return from infested regions around the world.

The melon fly is native to Asia. The melon fly occurs in Africa, Sri Lanka, China, Guam, India, New Guinea, Taiwan, Rota, the Ryukyu Islands, Thailand and much of Southeast Asia. In the United States, its distribution is limited to the Hawaiian Islands. The larvae of the melon fly have been recorded in over 100 different hosts worldwide. It is a particularly serious pest of melon and cucumber-type crops.

A female melon fly lays eggs under the skin of host fruit. These eggs hatch into larvae, or maggots, which tunnel through the flesh of the fruit or other plant parts, leaving the interior of the fruit a rotten mass and making it unfit for consumption.

Treatment of the melon fruit fly relies upon trapping. Fly lure is placed in a trap that attracts and eradicates the insects. Treatment in Kern County is already underway.

 

Leave a Reply

Grapes Stories
Grapes
June 5, 2017
Getting to the Bottom of Berry Scarring
It’s a costly defect, but learning what causes berry scarring can help you prevent it. Read More
Grapes
June 3, 2017
Powdery Mildew Management Tips for Vineyards
Follow these suggestions to help reduce disease pressure in your vineyard. Read More
Grapes
June 2, 2017
Cutting Down on Biggest Grape Growing Expense
An automated grapevine pruner hopes may help slash labor costs. Read More
Grapes
June 1, 2017
Organization Now Washington Winegrowers
New name and logo better reflects the evolution of the state’s industry, as more growers have wineries. Read More
Grapes
May 19, 2017
Researchers Still Have a Lot to Learn about Spotted Lanternfly
While some feeding habits have been recognized, there’s still a learning curve with this enigmatic invasive pest. Read More
Grapes
April 25, 2017
Examining the Effectiveness of Biologicals Against Downy Mildew in Grapes
Growing conditions in the East are breeding grounds for pathogens, and coupled with highly susceptible Vitis vinifera cultivars proves to make sustainable grape growing practices a challenge. Read More
glass of red wine
Grapes
April 20, 2017
Would You Be Willing to Pay More for Organic Wine?
While consumers might be ready to fork over more for organic produce, study says the feeling isn't quite the same when it comes to the adult beverage. Read More
Grapes
April 19, 2017
Donnell Brown Named President of National Grape & Wine Initiative
New president brings experience in wine industry communications. Read More
Grapes
March 28, 2017
Understanding the Economics Of Red Blotch in Grapes
An economist and a plant pathologist team up to help growers understand the threshold for action when a vine is diagnosed with the virus. Read More
Grapes
March 6, 2017
Washington Announces Record Winegrape Harvest
‘Cabernet Sauvignon’ is the leading grape variety, accounting for more than a quarter of the total harvest. Read More
Grapes
February 26, 2017
Winegrowers See Total Sustainability in Their Sights
Sonoma County Winegrowers eyes 2019 to become the U.S.’s first completely sustainable wine region. Read More
Grapes
February 18, 2017
Sustainability Is a Growing Factor in Wine Purchasing
California Sustainable Winegrowing Alliance updates certification program, shows sustainability is important part of wine trade. Read More
Grapes
February 17, 2017
Washington Organization Rebrands Itself
Washington Association of Wine Grape Growers unveils new identity at convention, now known as Washington Winegrowers Association. Read More
Grapes
February 14, 2017
2016 California Winegrape Crush Up 9%
Prices were up 12%, and red wine grapes continue to gain on white wine grapes in popularity, though ‘Chardonnay’ remained king. Read More
Grapes
January 30, 2017
Is the Intelligent Vineyard the Future of Winegrape Growing?
In the high desert of Arizona grows the world’s biggest viticulture laboratory. Read More
The Latest
Grapes
June 26, 2017
Washington Grape Grower Battles New Thre…
Apples, cherries, and pears are also threatened by Tobacco Ringspot Virus, a pathogen never before seen in Washington state. Read More
Food Safety
June 21, 2017
Organization Seeks Winegrape Exemption P…
California Association of Winegrape Growers says because winegrapes are grown for processing, they should be exempt from produce safety rule. Read More
Grapes
June 5, 2017
California Winegrowers Award Scholarship…
California Association of Winegrape Growers Foundation awards $30,000 in student scholarships. Read More
Grapes
June 5, 2017
Getting to the Bottom of Berry Scarring
It’s a costly defect, but learning what causes berry scarring can help you prevent it. Read More
Grapes
June 3, 2017
Powdery Mildew Management Tips for Viney…
Follow these suggestions to help reduce disease pressure in your vineyard. Read More
Grapes
June 2, 2017
Cutting Down on Biggest Grape Growing Ex…
An automated grapevine pruner hopes may help slash labor costs. Read More
Grapes
June 1, 2017
Organization Now Washington Winegrowers
New name and logo better reflects the evolution of the state’s industry, as more growers have wineries. Read More
Grapes
May 19, 2017
Researchers Still Have a Lot to Learn ab…
While some feeding habits have been recognized, there’s still a learning curve with this enigmatic invasive pest. Read More
Grapes
April 25, 2017
Examining the Effectiveness of Biologica…
Growing conditions in the East are breeding grounds for pathogens, and coupled with highly susceptible Vitis vinifera cultivars proves to make sustainable grape growing practices a challenge. Read More
Grapes
April 20, 2017
Would You Be Willing to Pay More for Org…
While consumers might be ready to fork over more for organic produce, study says the feeling isn't quite the same when it comes to the adult beverage. Read More
Grapes
April 19, 2017
Donnell Brown Named President of Nationa…
New president brings experience in wine industry communications. Read More
Grapes
March 28, 2017
Understanding the Economics Of Red Blotc…
An economist and a plant pathologist team up to help growers understand the threshold for action when a vine is diagnosed with the virus. Read More
Grapes
March 6, 2017
Washington Announces Record Winegrape Ha…
‘Cabernet Sauvignon’ is the leading grape variety, accounting for more than a quarter of the total harvest. Read More
Grapes
February 26, 2017
Winegrowers See Total Sustainability in …
Sonoma County Winegrowers eyes 2019 to become the U.S.’s first completely sustainable wine region. Read More
Grapes
February 18, 2017
Sustainability Is a Growing Factor in Wi…
California Sustainable Winegrowing Alliance updates certification program, shows sustainability is important part of wine trade. Read More
Grapes
February 17, 2017
Washington Organization Rebrands Itself
Washington Association of Wine Grape Growers unveils new identity at convention, now known as Washington Winegrowers Association. Read More
Grapes
February 14, 2017
2016 California Winegrape Crush Up 9%
Prices were up 12%, and red wine grapes continue to gain on white wine grapes in popularity, though ‘Chardonnay’ remained king. Read More
Grapes
January 30, 2017
Is the Intelligent Vineyard the Future o…
In the high desert of Arizona grows the world’s biggest viticulture laboratory. Read More