The California Department of Food and Agriculture has established two quarantines in San Joaquin County after individual Asian citrus psyllids were trapped in each area.
The quarantines prohibit movement of citrus and curry tree nursery stock out of the areas and require that all commercial fruit be cleaned of leaves or stems before moving it out. As an alternative, growers can treat their groves with an approved insecticide shortly before harvest.
Nursery stock and budwood grown in U.S. Department of Agriculture-approved structures are exempt.
Residents with dooryard fruit or plant material are asked not to transport them from the quarantine areas.
In addition to San Joaquin County, citrus psyllid quarantines have been established in Imperial, Los Angeles, Orange, Riverside, San Bernardino, San Diego, Santa Barbara, Tulare, Venture and portions of Fresno, Kern, San Luis Obispo and Santa Clara counties.
The concern is the Asian citrus psyllid can transmit citrus greening, also known as huanglongbing or HLB. Although harmless to humans and animals, the bacterial disease can stunt and even kill citrus trees.
In Florida, where the pest and disease are endemic, they have caused more than $4.6 billion in losses to that state's citrus industry, according to University of Florida figures.