News Release
California Department of Food and Agriculture
Media Contact:
Steve Lyle, Office of Public Affairs, (916) 654-0462,
Agricultural Quarantine Imposed to Halt Oriental Fruit Fly Spread
Release #02-052
Movement of crops, fruit, and vegetable crops out of Rancho Cucamonga/Upland area restricted
SACRAMENTO - The California Department of Food and Agriculture (CDFA) has established a 73 square mile quarantine zone in the Rancho Cucamonga/Upland area of San Bernardino County following the discovery of Oriental fruit flies.

“The quarantine is a necessary step to keep this threatening infestation from spreading,” said CDFA Secretary William (Bill) J. Lyons, Jr. “We will now dedicate ourselves to eradication, so that the quarantine may be lifted at the earliest possible time.”

Eradication relies upon a process known as “male annihilation”; workers apply a small patch of a pheromone attractant mixed with a very small dose of pesticide to poles or trees, approximately 8 feet off the ground. The males are attracted to the pheromone, consume the pesticide and die before they can mate. The treatment is non-intrusive and has repeatedly proven successful. Treatments will be repeated at two-week intervals for two life cycles beyond the last fly find, with a minimum of four applications.

Agricultural shipments from the quarantine zone will be limited to minimize movement of potentially infested commodities. In addition, homeowners and people moving through the quarantine zone are urged not to remove fruits and vegetables from the area.

The Oriental fruit fly is known to harm over 230 different fruit, vegetable and plant commodities. Damage occurs when the female lays eggs inside the fruit. The eggs hatch into maggots that tunnel through the flesh of the fruit, making it unfit for consumption.

The pest was first found in California in 1960. A number of major infestations have been successfully eradicated since then.

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California Department of Food and Agriculture Office of Public Affairs
1220 N St., Ste. 214, Sacramento, CA 95814