The California Department of Food and Agriculture has established a 107-square-mile quarantine zone in the El Cajon area of San Diego County, following the detection of 18 Mediterranean fruit flies.


So far, 18 wild adult Medflies have been detected at 12 sites in the area, and Medfly larvae have been detected at two sites, according to a state news release.

To view the quarantine boundary, visit

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

Agricultural shipments from the quarantine zone are restricted by specific regulations designed to minimize movement of potentially infested commodities. In addition, people moving through the quarantine zone are urged not to remove fruits and vegetables from the area.

The state already has begun a Medfly eradication program, which consists of releasing thousands of sterile male fliers of the area every week. In addition, workers will strip frujit within a 100-meter radius of each positive find, and they'll also treat the ground with the organic insecticide Naturalyte (spinosad) within a 200-meter radius of each positive find.

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