Release follows detection of five Medflies
Sterile medfly release set for San Jose, California

On Friday, October 12, the California Department of Food and Agriculture is scheduled to begin aerially releasing sterile Mediterranean fruit flies in a 10.67-square mile region of San Jose, following the detection of five Medflies in eastern San Jose near the intersection of Capitol Expressway and Story Road.

The sterile Medflies will be brought in from the joint CDFA/USDA rearing facility in Los Alamitos, which prepares hundreds of millions of sterile flies weekly for release over the Los Angeles Basin. For the San Jose project, nearly 2.7 million sterile Medflies will be released weekly. The flies, sterile males, have a proven track record in Southern California of breeding with wild females to help achieve eradication.

“This program is a great example of research and science working to benefit the public and the environment,” said CDFA Secretary A.G. Kawamura. “It wasn’t very long ago that a Medfly infestation meant spray treatments by helicopter. A lot of Bay Area residents probably remember that. Now we have a solution that relies largely on biological control. It’s a great example of progress offered by integrated pest management principles.”

The first Medfly in San Jose was detected On September 18, 2007 - a single female found in a trap that is part of the statewide exotic fruit fly detection program. In response to this detection, additional traps were placed in the area. During a scheduled inspection of these traps, four additional Medflies were detected on October 10, 2007.

The sterile Medfly project in Los Alamitos, called the Preventive Release Program, was introduced in 1996 and has been instrumental in redefining Medfly response in California. It has also dramatically reduced the number of infestations. Between 1987 and 1994, an average of 7.5 Medfly infestations were discovered each year in California. Since the Preventive Release Program began in 1996, there have been just six infestations statewide. The last Medfly infestation in San Jose was in 2005.

In addition to the sterile releases, CDFA is conducting ground treatments in a 200-meter radius—about one-eighth of a mile—from the locations of the two detections. The substance being utilized is the organic compound Naturalyte (active ingredient: spinosad), a naturally occurring extract from bacteria.

CDFA is working with the Santa Clara County Agricultural Commissioner’s office to identify properties that market commercial agricultural commodities, in preparation for a quarantine to prevent the spread of the Medfly through movement of host plants. “There are $130 million dollars in fruit and vegetable crops that would be threatened by the spread of this pest,” said County Agricultural Commissioner Greg Van Wassenhove.

A quarantine is being prepared to prevent the spread of the Medfly through movement of host plants.

The Medfly can infest over 260 types of fruits and vegetables, causing severe impacts on California agricultural exports and backyard gardens. A permanent infestation would result in estimated annual losses of $1.3 to $1.8 billion.

Publication date: 10/12/2007

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