Citrus Greening in Florida Backyards: Symptoms, Management, and Removal

Citrus greening—also called HLB or Huanglongbing—is widespread in Florida and has no cure for an infected tree.

That does not mean every yellow citrus leaf proves HLB.

A useful homeowner process is:

recognize the symptom pattern → compare likely look-alikes → contact Extension or a qualified citrus resource → decide whether management still provides acceptable fruit and value → remove when the tree no longer justifies continued care

Use this symptom-comparison table

Symptom	More consistent with HLB	May also point elsewhere
Blotchy mottle	Irregular yellow and green pattern that is not mirrored across the midvein	Nutrient deficiency may show a more symmetrical pattern
Yellow shoot	One or more shoots stand out from the canopy	Root, irrigation, nutrient, or other stress can also affect shoot color
Small or lopsided fruit	Common HLB clue when combined with leaf and canopy symptoms	Fruit load, water, nutrition, or another disorder
Fruit remains green at blossom end	Recognized HLB-associated pattern	Evaluate the whole symptom set
Aborted seeds or curved fruit core	Supports HLB suspicion	Requires fruit inspection and context
Sparse canopy and twig dieback	Can occur as disease progresses	Root damage, drought, flooding, other disease, or severe nutrition problem
One yellow leaf	Not enough for diagnosis	Normal aging, nutrient, root, or local injury
Symmetrical interveinal chlorosis	Less typical of blotchy mottle	Nutrient deficiency may be more likely

UF/IFAS provides a visual comparison specifically for HLB and nutrient deficiencies.

What HLB is

UF/IFAS describes HLB as a citrus disease associated with the bacterium Candidatus Liberibacter asiaticus and transmitted by the Asian citrus psyllid.

The disease affects the tree’s vascular system, contributes to decline, reduces fruit quality and productivity, and eventually makes many trees unproductive.

Supportive care may help an infected tree remain productive for a period. It does not eliminate the infection.

Do not diagnose from color alone

Before deciding that a tree has HLB, review:

• leaf pattern on both sides of the midvein
• yellow shoots
• fruit size and shape
• blossom-end color
• seeds and fruit interior
• canopy density
• twig dieback
• irrigation
• soil and root condition
• fertilizer history
• nearby citrus symptoms
• Asian citrus psyllid activity

Take photos in good natural light.

Contact UF/IFAS Extension

A county Extension office can help homeowners:

• compare symptoms
• identify nutrient-pattern look-alikes
• review current backyard citrus guidance
• decide whether laboratory or other confirmation is useful
• interpret management options
• identify local resources

Use the UF/IFAS Extension office directory to locate the appropriate county office.

Management is not cure

If the tree still produces acceptable fruit and has value to the owner, management may focus on:

• consistent irrigation
• appropriate citrus nutrition
• soil pH and root-zone conditions
• avoiding unnecessary pruning
• reducing additional stress
• monitoring psyllids and other pests
• replacing poor cultural practices
• realistic expectations about decline

Do not apply more fertilizer merely because leaves are yellow.

Use Does a Florida Tree Need Deep Root Fertilization? for the diagnosis-before-treatment principle.

Asian citrus psyllid

The Asian citrus psyllid is the principal vector associated with HLB spread in Florida.

Psyllid management decisions should consider:

• correct identification
• life stage
• flush timing
• neighboring host plants
• beneficial insects
• product label
• edible-crop restrictions
• harvest intervals
• application method
• Florida licensing rules for commercial applications

Do not use an ornamental-tree pesticide on citrus unless the product label permits that use.

Pruning has a limited role

Routine heavy pruning does not cure HLB.

Pruning may be appropriate for:

• dead or broken wood
• access
• selected freeze damage
• removal preparation
• a clearly defined horticultural objective

Avoid repeatedly cutting the canopy to “remove the disease.”

When removal becomes realistic

Removal may be the more practical choice when:

• fruit is no longer useful to the owner
• canopy decline is advanced
• repeated care no longer produces an acceptable result
• deadwood creates maintenance concerns
• the tree occupies a valuable planting location
• the owner does not want continued psyllid and management pressure
• Extension or a qualified citrus resource supports replacement

Removal is a horticultural and property-use decision, not proof that the tree is an immediate structural emergency.

Removal and stump scope

Before hiring, decide:

• whether fruit and small branches will be removed
• whether the entire tree will be hauled
• whether stump grinding is included
• whether roots interfere with replanting
• whether irrigation is nearby
• whether Sunshine 811 and private locating are needed
• what replacement will occupy the site

Use Can a Diseased Tree Be Removed Without Spreading the Problem? for sanitation and scope questions.

Visit tree removal services for physical removal.

Visit stump grinding services for the separate stump scope.

Call (855) 498-2578 for Florida physical tree-work routing after the diagnosis and management-versus-removal decision are made.

Sources reviewed

• UF/IFAS — Citrus Greening Topic Resources
• UF/IFAS — HLB and Nutrient Deficiency Identification
• UF/IFAS — Citrus Problems in the Home Landscape
• UF/IFAS — Citrus Quick Reference Guides
• UF/IFAS — Find Your Local Extension Office
• U.S. EPA — Introduction to Pesticide Labels
• Florida Department of Agriculture and Consumer Services — Pesticide Applicator Licenses