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

Featured Stories

CEU SeriesCEU Series: Pesticide Labels Are A Must-Read
November 1, 2014
Be cued into what's on the container as well as safety data sheets. Read More
CitrusForecast: South Florida Dry Season May See Fair Share Of Damp Days
October 31, 2014
Outlook calls for possible above-normal precipitation around region for fall and winter months. Read More
ProductionDrought Forcing California Growers To Rely On Groundwater
October 31, 2014
While the state issues curtailments to those with junior rights, growers are increasingly relying on groundwater to irrigate their crop. Read More
Crop ProtectionThe Unlikely Parallel Between Human And Plant Health
October 31, 2014
One of the notable national developments in the summer of 2014 was the unexpected occurrence of serious respiratory infections in Read More
VegetablesWhy You Should Be Trialing New Vegetable Varieties
October 31, 2014
Selecting high-performing selections is no easy task. Read More
FruitsCalifornia Growers Sue State Over Drought
October 30, 2014
They claim the State Water Resources Control Board illegally denied water deliveries. Read More
CucurbitsNew Watermelon Planting Program For The Southeast U.S.
October 30, 2014
Sakata seeking to make regional impact by providing in-demand material through several local producers. Read More
Leafy Vegetables3 Can’t-Miss Cabbage Varieties For Florida Growers
October 30, 2014
Reed's Seeds highlights a trio of high-performance selections for Sunshine State producers. Read More
Insect ControlTake Control Of Thrips In Your Greenhouse
October 30, 2014
Why such a foreboding title? Thrips, one of the tiniest pests of greenhouse crops, are the carrier of one of Read More
BerriesManage Black Root Rot Of Strawberry
October 30, 2014
Controls include preplant nematode analysis, three-to-five year crop rotations, and more. Read More

The Latest

CEU SeriesCEU Series: Pesticide Labels Are A Must-Read
November 1, 2014
Be cued into what's on the container as well as safety data sheets. Read More
CitrusForecast: South Florida Dry Season May See Fair Share O…
October 31, 2014
Outlook calls for possible above-normal precipitation around region for fall and winter months. Read More
ProductionDrought Forcing California Growers To Rely On Groundwat…
October 31, 2014
While the state issues curtailments to those with junior rights, growers are increasingly relying on groundwater to irrigate their crop. Read More
Crop ProtectionThe Unlikely Parallel Between Human And Plant Health
October 31, 2014
One of the notable national developments in the summer of 2014 was the unexpected occurrence of serious respiratory infections in Read More
VegetablesWhy You Should Be Trialing New Vegetable Varieties
October 31, 2014
Selecting high-performing selections is no easy task. Read More
FruitsCalifornia Growers Sue State Over Drought
October 30, 2014
They claim the State Water Resources Control Board illegally denied water deliveries. Read More
CucurbitsNew Watermelon Planting Program For The Southeast U.S.
October 30, 2014
Sakata seeking to make regional impact by providing in-demand material through several local producers. Read More
Leafy Vegetables3 Can’t-Miss Cabbage Varieties For Florida Grower…
October 30, 2014
Reed's Seeds highlights a trio of high-performance selections for Sunshine State producers. Read More
Insect ControlTake Control Of Thrips In Your Greenhouse
October 30, 2014
Why such a foreboding title? Thrips, one of the tiniest pests of greenhouse crops, are the carrier of one of Read More
BerriesManage Black Root Rot Of Strawberry
October 30, 2014
Controls include preplant nematode analysis, three-to-five year crop rotations, and more. Read More
FruitsSexual Evolution May Bear More Fruit In The Orchard
October 30, 2014
Scientists take a closer look at genes and find new plant breeding possibilities. Read More
Apples & PearsWashington Apples To Restart Shipments To China
October 29, 2014
Agreement reached between U.S. and Chinese governments to reinstate market access after two-year absence. Read More
EquipmentEnter To Win A Kubota At The Washington State Horticult…
October 29, 2014
Attendees have a chance to take home a new utility vehicle courtesy of Wilbur-Ellis and Western Fruit Grower. Read More
CitrusUSDA To Provide $4 Million For Honey Bee Habitat
October 29, 2014
The funds will go toward helping growers implement conservation practices to improve honey bee health. Read More
FruitsHuge California Drought Meeting Planned
October 29, 2014
State, federal officials to meet as forecasts for the coming year look bleak. Read More
PotatoesNew CEO At Black Gold Farms, A Top 100 Grower
October 28, 2014
Eric Halverson takes the reins at the potato operation, while his father Gregg will remain president of the farm’s board of directors. Read More
FruitsValent U.S.A., MGK Enter Into Marketing Agreement
October 28, 2014
Valent U.S.A. to manage the marketing and sales of MGK’s crop protection line of insect control products beginning in April 2015. Read More
VegetablesMultistate Land-Grant University Research Project Contr…
October 28, 2014
The project began in the 1970s as a Regional Initiative and has since expanded Internationally. Read More