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Unprecedented Fruit Fly Infestation in California

Unprecedented Fruit Fly Infestation in California

California is currently grappling with one of the most severe fruit fly infestations, with seven active quarantines across the state. However, the infestations in San Bernardino and Riverside counties are particularly alarming, posing a significant threat to the region's agriculture. In this article, we explore the severity of the issue and the measures being taken to combat this destructive pest.

Severity of the Infestation in San Bernardino and Riverside Counties

The Oriental Fruit Fly (Bactrocera dorsali) infestation in these counties is among the most severe exotic fruit fly incidents in recent California history and currently the worst in the state. The larger initial population has made it challenging to control, and the affected quarantine area is expanding, standing at approximately 350 square miles last week.

Potential Economic Impacts

Allowing the fly to establish in California could have devastating economic and environmental consequences for our agricultural industries. The economic cost, including crop losses, increased pesticide use, and quarantine requirements, is estimated to range from $44 to $176 million. The impact on fruit prices, home gardens, and export options would be substantial, given that these flies are not plant-specific and damage a wide variety of crops.

Bactrocera dorsali

Measures Being Taken to Address the Infestation

Efforts to eradicate this infestation are underway, with collaborative initiatives involving industry members and various government levels. Emergency staff deployment, intensive monitoring with traps, and pre-harvest treatments are commendable measures. The ongoing exotic fruit fly trapping program has a proven track record in preventing the entry of such pests into the state.

Protection of the Citrus Variety Collection at UC Riverside

While the quarantine has not reached the campus yet, precautionary measures are in place, including the initiation of recommended treatment programs to protect the valuable fruit. Researchers are assessing potential impacts on ongoing experiments and adapting research plans accordingly. Residents play a crucial role in safeguarding the region by following preventive measures, reporting sightings to the pest hotline, and cooperating with Department of Agriculture inspections.

This analysis underscores the urgency of a collective effort to protect California's agricultural landscape, and residents are urged to take necessary precautions to mitigate the spread of this destructive pest.

Source: "Q&A: One of the world's worst pests attacks California" (, 2023, November 22) retrieved 23 November 2023 from

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