From the Orange County Register:

As they prepare to start applying insecticides to fruit trees in parts of San Juan Capistrano on Monday, state officials asked residents at a public meeting Thursday night to help prevent the spread of a bug-borne virus that could threaten California's $2 billion citrus crop.

State detection teams recently discovered the Asian citrus psyllid near Junipero Serra Road and Camino Capistrano in San Juan. The tiny flying insect carries huanglongbing, or "yellow dragon disease," which attacks citrus trees, producing yellowing, blotchy leaves and bitter and misshapen fruit and eventually killing the tree.

To try to prevent the bug's spread, officials of the California Department of Food and Agriculture plan to begin Monday to apply insecticides to citrus trees and surrounding soil in an area roughly between Alipaz Street in the west and La Novia Avenue in the east, centered by Camino Capistrano and San Juan Creek Road. In the next month, about 6,000 residents will receive notices describing the process and scheduling times for the treatment.

Officials say California is the last major citrus-growing region in the world that has not been decimated by the HLB virus.

For more, see: Citrus treatments against virus-bearing bug begin Monday in San Juan