A citrus tree that is thinning, yellowing, or dropping fruit in San Diego County is a report-and-identify job, not a weekend spray. Huanglongbing (HLB, citrus greening) is present in California. Asian citrus psyllid spreads the bacterium. Yellow leaves also come from water, root rot, nutrient issues, and other pests. You cannot finish that list from a phone photo.

San Diego County Agriculture, Weights and Measures lists ongoing HLB quarantines in Fallbrook, Oceanside, Rancho Bernardo, Valley Center, and Ramona (updated September 2026). APHIS DA-2026-40 (October 1, 2026) expanded the federal HLB quarantine by 155 square miles in the Murrieta area of Riverside and San Diego Counties, paralleling CDFA’s September 11, 2026 intrastate quarantine.

Branch Pro San Diego is a referral service. We connect you with licensed, insured independent local tree professionals. You hire and pay the professional directly. We don’t diagnose HLB, treat psyllids, or remove citrus for CDFA.

What should you do before anyone cuts the tree?

If you see blotchy yellowing, lopsided fruit, or a sudden decline, call the CDFA citrus pest hotline at 1-800-491-1899. That number is published by the Citrus Pest and Disease Prevention Division. County AWM says the same hotline for suspicious HLB symptoms.

Don’t move citrus plants, budwood, or unprocessed fruit off the property if you are in or near a quarantine area. County AWM states that residents in a five-mile radius of an HLB quarantine area are prohibited from moving citrus and HLB host plants or plant materials. Check the current CDFA HLB quarantine map for your address. Maps change.

A lemon in a City Heights back yard and a grove-edge navel in Valley Center are not the same regulatory setting. Look up the address. Don’t copy a neighbor’s dump run.

What else makes citrus look like it is dying?

Water against the trunk, a clogged basin, and Phytophthora-style root problems can yellow a tree that has no HLB. Overwatering a lawn bowl around a Meyer lemon is a common city-lot pattern. Underwatering on a rocky Fallbrook slope is another.

Asian citrus psyllid can be present without a confirmed HLB-positive tree. Sticky new flush and twisted leaves are clues for a qualified inspector, not a product plan.

Don’t assume a fertilizer spike will green it up. Don’t buy a random systemic because a forum named one. CDFA’s response to a confirmed HLB-positive tree is a regulatory program, not a referral-company treatment menu.

Tree health diagnosis is how you request a professional look at a private tree that is not already in a CDFA removal order. If CDFA has posted a notice on that property, follow CDFA and County AWM, not a private quote.

When is a tree company involved at all?

A matched tree professional can remove a citrus tree that is dead, hazardous, or approved for removal after the regulatory questions are clear. That is tree removal, a separate scope from pest identification. Stump grinding is separate again if you will replant, and replanting citrus inside a quarantine has its own nursery and movement rules.

For paid tree work that is not a CDFA order, look up the license on the CSLB license lookup. An active C-49 Tree and Palm license or an active legacy D-49 can both be valid. California’s current minor-work threshold is an aggregate price under $1,000, with extra conditions.

Frequently asked questions

Do yellow leaves mean the tree has HLB?

No. HLB is confirmed by official testing. Yellowing has other causes. Call the CDFA hotline if HLB is a concern.

Can I take fruit to a friend in another city?

Not if quarantine rules for that address forbid moving fruit or host material. Check the current map. When in doubt, keep it on the property.

Will CDFA always remove a backyard lemon that looks sick?

CDFA removes trees that test positive under its program. A sick tree that has not been tested is not automatically in that pile. Report symptoms. Don’t pre-cut to “beat the inspectors.”

Can Branch Pro tell me if I am inside the Murrieta-area expansion?

No. Use the CDFA map and County AWM. We connect you with a tree professional after the regulatory path is clear.

Get connected with a local pro

Report suspected HLB to CDFA at 1-800-491-1899. For a private citrus tree that is hazardous or already cleared for removal, call (858) 400-4423. We’ll connect you with a licensed, insured independent local professional. Describe the species, the address, and any CDFA or County notice on the property. You hire and pay that professional directly.