Scentry Biologicals Inc. has a glueboard in a local citrus tree, on the lookout for negative bug infestations like Asian citrus psyllid (ACP), an invasive, aphid-like insect pest. Although the psyllid is not a serious problem by itself, it can transmit a devastating bacterial disease to citrus trees. Known as Huanglongbing (HLB), the disease ruins the taste and appearance of citrus fruit, and eventually kills infected trees. There is no treatment or cure for Huanglongbing, and all commercially valuable varieties of citrus are vulnerable. If ACP and HLB reach Ventura County, and cannot be eradicated or contained, it is likely that the county will cease to be a significant producer of citrus fruit within a decade. But the potential threat posed by ACP and the disease it transmits goes well beyond commercial citrus production and the jobs, income and tax dollars it generates. Tens of thousands of trees in residential yards also are at risk. They, too, will die if infected with HLB, meaning that this iconic element of the suburban Southern California landscape — the backyard orange, lemon, lime, grapefruit or tangerine tree — also might disappear from Ventura County. Courtesy Farm Bureau of Ventura County.