The orange trees growing in Southern California neighborhoods are more than decorative reminders of the region's agricultural past. For many families, they are living connections to an era when citrus groves shaped the landscape, supported local employment and helped establish the Inland Empire's identity.
Now, an insect small enough to escape casual notice is the subject of a new public warning affecting the Colton area.
On October 7, 2026, the City of Colton posted information from the California Department of Food and Agriculture concerning an emergency program for the Asian citrus psyllid and Huanglongbing, a serious disease affecting citrus trees. The announcement references San Bernardino County Program RS-1600 and includes treatment mapping and an emergency proclamation.
The notice places attention on a problem that may be unfamiliar to residents who have never worked in agriculture but who enjoy oranges, lemons, limes or other citrus fruit growing in their yards.
The Asian citrus psyllid is a small insect that feeds on citrus plants. Its greatest danger is that it can transmit the bacteria associated with Huanglongbing, also called citrus greening disease.
The disease damages a tree's ability to transport nutrients, eventually affecting its health and fruit production. Infected trees can decline over time, and there is currently no cure that restores an infected tree to health.
That makes prevention, detection and control particularly important.
California's citrus industry has faced the threat of the Asian citrus psyllid for years. Agricultural agencies have developed monitoring, quarantine and treatment programs intended to slow the insect's spread and protect commercial and residential citrus trees.
The October notice is part of that broader effort.
For Colton residents, the issue reaches beyond commercial agriculture.
Although the city's economy and landscape have changed considerably over the decades, backyard citrus trees remain a familiar sight throughout the Inland Empire. Some are planted for fruit, others for shade or landscaping, and many have been maintained by families for generations.
A homeowner may see a citrus tree as an ordinary part of the property, but plant pests and diseases do not recognize property boundaries.
An insect that moves between trees can potentially connect residential landscapes with surrounding agricultural areas.
That is why state agricultural programs often involve residential neighborhoods as well as commercial growing operations.
The City's notice references an official treatment map, which is important because not every property is necessarily included in the same treatment area. Residents should consult the current California Department of Food and Agriculture documents rather than assume that every citrus tree in Colton is scheduled for treatment.
Specific treatment locations, dates and procedures must be verified through the official program materials.
The public health and environmental aspects of pest management also deserve attention.
Residents may reasonably want to know what treatments are being considered, how notification works and what precautions apply to children, pets, gardens and outdoor areas.
Those questions should be answered through the administering agency's official notices, which provide information specific to the treatment program and location.
Homeowners can also help by remaining attentive to the condition of their citrus trees.
Yellowing leaves, irregularly colored fruit, unusual plant decline or the presence of small insects may warrant closer inspection. However, those symptoms can have several causes, and residents should not attempt to diagnose Huanglongbing solely from appearance.
State agricultural officials can provide guidance about reporting suspected problems and avoiding the accidental spread of pests through citrus plants or plant material.
The issue is especially meaningful in a region whose history is closely tied to citrus production.
For generations, citrus cultivation contributed to the economic and cultural development of communities across San Bernardino and Riverside counties. The surviving trees in residential neighborhoods are reminders of that agricultural heritage.
Protecting them is therefore not simply a matter of preserving fruit production. It is also a way of protecting a recognizable part of the region's history.
The October announcement demonstrates how local government can serve as an important communication link between state agencies and residents.
A technical agricultural proclamation may initially seem remote from daily life. But when the subject is a disease that threatens trees growing just outside people's homes, the information becomes immediately relevant.
Colton residents with citrus trees should review the official notice, determine whether their property is within a designated treatment area and follow instructions issued by the responsible agricultural authorities.
The future of the region's citrus heritage may depend in part on decisions made far from commercial orchards, in ordinary backyards where families continue to care for the trees that connect them to Southern California's past.