Guava Fruit Fly

Guava Fruit Fly

In July of 2013, the State lab confirmed three detections of Guava Fruit Fly in the City of San Jose.  As a result of these finds, the Secretary of Agriculture issued an emergency proclamation authorizing an eradication project.

Treatment is scheduled to begin on Wednesday, July 17, 2013 in a 19 square mile area surrounding the finds using the "male attractant" technique.  This technique uses ground-based, spot applications of minute amounts of insecticide and feeding attractant lure. The treatment is applied as small, dollar-sized spots on inanimate objects such as street trees and utility poles approximately 8 feet off the ground. The male fruit flies are attracted to these spots because of the lure, and die from feeding on the mixture. The treatments are applied at heights that are typically inaccessible and cause minimal disruption to the public.

To view a map of the treatment area, scroll down below and click on the “Guava FF Treatment area – San Jose”.

The infestation in San Jose marks the tenth time in 17 years Guava Fruit Fly has been detected in Santa Clara County. Eradication projects were conducted in 2000, 2001, 2002, 2004, and now in 2013. The California Department of Food and Agriculture (CDFA) successfully eradicated Guava Fruit Fly in each instance using the male attractant technique.

The Guava Fruit Fly is known to occur in India, Pakistan, Nepal, Sri Lanka and Thailand. If allowed to become established in California, it has the potential to become a major pest of citrus, peach, and several kinds of tropical and subtropical fruits. Fruit damage occurs when the adult female fly lays eggs in the fruit. These eggs hatch into larvae or maggots that tunnel through the flesh of the fruit making it unfit for consumption.

These infestations are likely the result of contraband fruit smuggled into California. We ask all Californians not to bring fruit or vegetables back from your travels. Exotic fruit flies impact not only our multi-billion-dollar agricultural industry, but threaten California’s native and urban environments.

CDFA Website: For more information about the Guava Fruit Fly, you can visit the California Department of Food and Agriculture’s website.

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