The Asian citrus psyllid and the deadly
Huangbinglong (HLB) disease that it spreads
threaten citrus trees in backyards and on
farms. The psyllid arrived in Southern California in
2008, and the HLB disease was first detected in Los
Angeles in 2012. All types of citrus—including oranges,
grapefruit, lemons, and mandarins—are affected as well
as a few closely related ornamentals.