Asian citrus psyllid (ACP) discoveries in Tulare County, Calif. have spread to the City of Dinuba, where “numerous ACP adults and nymphs” were confirmed by officials.

An extensive survey and treatment program has begun in the area. Treatment of plants within 800 meters of the discovery site will begin immediately. Residents will be notified in advance of treatment programs by the State of California.

The major concern of the ACP is the disease it vectors, called Huanglongbing (HLB). The disease eventually kills citrus trees and renders fruit bitter and misshapen. Only one confirmed case of the HLB in California has been discovered.

“We want to emphasize that citrus fruit is safe to eat and that the disease is not harmful to human health,” said Marilyn Kinoshita, Tulare County Ag Commissioner.

In order to limit the spread of the psyllid, residents are urged not to transport citrus fruit or plant materials from their property.

A 178-square-mile quarantine zone was recently established in the Porterville area of Tulare County after several ACPs were discovered earlier this summer. Dinuba is about 50 miles north of Porterville.

For more information on the ACP and HLB, visit the California Department of Food and Agriculture at

The University of California also has some useful information on HLB and the ACP for commercial growers and homeowners at