Citrus Greening (Huanglongbing)


Citrus Greening (Huanglongbing)

  • You should manage your grove as if you already have greening
  • It is an integrated approach of the use of disease free nursery stock, reduction of the inoculum by frequent disease surveys, removal of symptomatic trees and suppression of the Asian citrus psyllid

Antibacterial Management

  • Suggested Antibacterial Product Use Pattern for Huanglongbing (HLB; citrus greening) Management PDF
  • Crisis Declaration PDF


  • Use of clean bud wood and certified healthy trees
  • Only purchase trees from a certified nursery

Tree Removal

  • Only way to ensure infected trees will not serve as a source inoculum
  • Pruning of symptomic branches will NOT be successful




  • Four times a year is recommended
  • If you currently have greening in your grove or close by, scouting more than four times a year is recommended
  • Symptoms are most easily seen September through March
  • During the spring flush, scouting becomes more difficult and scouts should look further into the tree canopy


  • Tractor or pickup mounted platform
      - Use a mounted platform for taller trees
  • ATV's
      - Medium sized trees can be scouted from an ATV
  • Walking
      - Young trees can be scouted by walking
  • Tractor or pickup mounted platform

 scouting methods


Diagram on a suggested scouting movement within a grove

Grove Survey

Grove Conditions

  • Scouting is more difficult in an unkept grove
  • Nutritional deficiencies can cause greening symptoms to blend and go unnoticed
  • Excessive weeds and unmanaged row middles cause scouts to watch where they are walking more than scouting
  • Tree size


  • Several colored flagging tapes are available
  • Choose a tape that will only be used for greening and cannot be confused with other colored flagging tape

Flagging tape

• If a suspect tree is found, flag the suspected branch and write on the flagging tape the inspector's name and date

Flagging Tape

• Mark the end of the row and the number of suspect trees in that row

Safety Concerns

  • Grove conditions
  • Chemical spray applications
  • Weather
  • Potential for slips and falls

Additional Resources

Asian Citrus Psyllid Management

  • Some biological control of the psyllid is available but the amount of psyllid control provided by introduced parasitoids has been insufficient to slow disease spread

  • Area wide spay programs through citrus health management areas (CHMA)

  • Speed sprayer, low volume and aerial are application methods available

Grower Experience

Host Plants

  • If possible, remove host plants, Murraya paniculata (orange jasmine) and Severinia buxifolia (box orange) from around a commercial citrus grove

    Photo Credit: Steve Futch, Ph.D.

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