Medfly

Protecting California Citrus Industry

State’s Citrus Industry at a Crossroads

By Patrick Cavanaugh, Farm News Director

Karen Ross, Secretary of the California Department of Food and Agriculture, told California Ag Today recently that the fight to protect the California citrus industry from Citrus Greening is ongoing with many moving parts.

“We are working closely with both with USDA and county ag commissioners to protect our important citrus industry,” she said. “And funding from our federal agency partners is important in the fight.”

“There is a strong sense of urgency, and I honestly feel we’re at a significant crossroads because of the most recent Huanglongbing infected tree finds in Southern California that keep the infected Asian Citrus Psyllid numbers up,” Ross explained.

She noted that the biggest challenge is citrus in the state’s urban areas.

“The beauty of citrus is that nearly every Californian has a citrus plant of some kind. That’s also one of our biggest challenges right now, because we’re very dependent on our urban residential neighbors to allow inspectors to repeatedly go to their door, in order to take samples, and then possibly having to go back and pull trees.

Ross said that the state has dedicated full time leadership to help fight HLB. There’s a lot of moving parts in the program.

“It’s gotten very large, and we’re going do whatever we need to do to make sure California citrus has a long, long part of our history and our economy,” she said.

Ross noted that the Asian Citrus Psyllid isn’t the only pest concerning California agriculture.

“Besides our big Asian citrus psyllid program, we have ongoing medfly infestations, several fruit fly infestations, and light broth apple moth infestation, and we are working on Japanese beetle eradication programs,” she said.

2021-05-12T11:01:58-07:00October 31st, 2017|

New Medfly Quarantine

A portion of San Diego County was placed under Medfly quarantine earlier this week following the detection of 4 adult Mediterranean fruit flies (Medflies) in the La Mesa area.  The United States Department of Agriculture (USDA), the San Diego County Agricultural Commissioner, and CDFA are working collaboratively on this project.

The quarantine area in San Diego County measures 93 square miles, bordered on the north by Prospect Avenue; on the south by Mount Miguel Road; on the west by Fairmount Avenue; and on the east by Vista Grande Road.  A link to the quarantine map may be found here: www.cdfa.ca.gov/plant/medfly/regulation.html.

To eradicate the infestation, the release of sterile male Medflies began on August 10, at a rate of 250,000 flies per square mile per week.  The new release area is approximately 59 square miles.  In addition, properties within 200 meters of detections are being treated with an organic formulation of Spinosad, which originates from naturally-occurring bacteria in soil, in order to eliminate any mated females and reduce the density of the population. Finally, fruit removal will occur within 100 meters of detection properties in order to remove any fruit infested with eggs and larvae.

The quarantine will affect any growers, wholesalers, and retailers of susceptible fruit in the area as well as local residents. Home gardeners are urged to consume homegrown produce on site and not move it from their property.  These actions protect against the artificial spread of the infestation to nearby regions where it could affect California’s food supply and our backyard gardens and landscapes.

In the eradication program,  sterile male Medflies are brought to San Diego County from the joint CDFA/USDA sterile insect rearing facility in Los Alamitos, which prepares sterile files for release everyday over the Los Angeles basin.  The sterile release program has a proven track record of eradication in southern California.  Sterile male flies mate with fertile female flies in the environment but produce no offspring.  The Medfly population decreases as the wild flies reach the end of their natural life span with no offspring to replace them, ultimately resulting in the eradication of the pest.

The Medfly can infest more than 250 types of fruits and vegetables, causing severe impacts on California agricultural exports and backyard gardens alike.  Residents who believe their fruits and vegetables are infested with fruit fly larvae are encouraged to call the state’s toll-free Pest Hotline at 1-800-491-1899.

2016-05-31T19:28:06-07:00August 21st, 2015|
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