A batch of glassy-winged sharpshooter egg clusters has been found in California's wine region. The discovery has raised concerns about efforts to keep the vineyard pest out of the state.

Agricultural inspectors in Sonoma and Napa counties found the eggs at nurseries in Petaluma, Napa and Angwin.

The insect carries a bacterium that causes Pierce's disease that kills grapevines and other plants by interfering with their ability to absorb moisture and nutrients.

Agricultural officials from the state believe the recent increase in sharpshooter egg discoveries in northern California is due to the large number of plants arriving earlier this year from southern California.