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Publication #CH201

Scouting for Citrus Greening: Scouting Today to Protect Future Profits1

Jamie D. Burrow, Stephen H. Futch, and Timothy M. Spann2

This illustrated trifold brochure is best viewed in pdf format. It highlights the purpose of scouting, frequency, methods, grove conditions, tagging suspect trees, scout responsibilities, safety concerns, diagnostics, and what to scout for. Includes contact information for UF/IFAS Extension citrus experts.

Click here to download this brochure.

PURPOSE OF SCOUTING

The purpose of scouting is to aid in managing greening by:

  • Identifying greening-infected trees

  • Planning a management program

FREQUENCY

  • Symptoms are most visible during the fall and winter months

  • Survey frequency would be determined by incidence and citrus greening management plan

  • Spring flush makes scouting more difficult

METHODS

  • Walking

  • ATVs

  • Tractor- or vehicle-mounted platform

SCOUT RESPONSIBILITIES

  • To locate and identify greening symptoms

  • Operators of platforms and ATVs are responsible for transporting survey crews safely

  • Follow all company procedures for entering and exiting grove

GROVE CONDITIONS

Grove conditions which can hinder a scouting program include:

  • Unmaintained grove middles, tree size, and/or canopy

  • Nutrient deficiencies

  • Non-hedged rows

  • Disease or insect damage

TAGGING SUSPECT TREES

  • Use one color of flagging tape to identify suspect trees

  • Choose colors or designs that cannot be confused with other commonly used flagging tapes

  • GPS or grove map should be used in conjunction with flagging tape to identify positive greening-infected tree

SAFETY CONCERNS

  • Safety is a priority when scouting

  • Follow re-entry intervals for chemical applications

  • Be aware of weather and climate conditions

  • Watch for power lines

  • Always keep a first aid kit in a readily accessible location

  • Employees should be trained in the proper procedures in case of an emergency

WHAT TO SCOUT FOR

BLOTCHY MOTTLE = GREENING

Yellow veins, vein corking, and green islands are not diagnostic alone. These symptoms should be coupled with blotchy mottle symptoms and a positive PCR to determine a greening-infected tree.

Figure 14. 

Trees with a yellow appearance, shoot dieback, sparse foliation, and thin canopy.


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Figure 15. 

Blotchy mottle leaves.


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Figure 16. 

Vein corking and blotchy mottle.


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Figure 17. 

Green islands.


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Figure 18. 

Lopsided, misshapen, small fruit.


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Figure 19. 

Yellow veins and/or off-season bloom.


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DIAGNOSTICS

Southern Gardens Diagnostic Laboratory
111 Ponce de Leon Ave.
Clewiston, FL 33440
(863) 902-2249
Contact: Mike Irey
msirey@ussugar.com
UF/IFAS Southwest Florida REC
2685 SR 29 N.
Immokalee, FL 34142
(239) 658-3400
http://swfrec.ifas.ufl.edu/programs/plant-path/hlb.php
hlblab@ufl.edu
Florida Division of Plant Industry
PO Box 147100
Gainesville, FL 32614-7100
(800) 282-5153
UF Plant Diagnostic Center
Building 1291, 2570 Hull Rd.
Gainesville, FL 32611
352-392-1795

Before sending samples, contact the testing facility to obtain proper sampling procedures, submission guidelines, and fees.

CONTACTS

UF/IFAS Citrus Research and Education Center
Jamie Burrow
Canker & Greening Extension Education
863-956-8648
Megan Dewdney, Ph.D.
Plant Pathologist
863-956-8651
Tripti Vashith, Ph.D.
Horticulturist
863-956-8846
Michael Rogers, Ph.D.
Entomologist
863-956-8801
UF/IFAS Southwest Florida Research and Education Center
Pamela Roberts, Ph.D.
Plant Pathologist
239-658-3430
Phil Stansly, Ph.D.
Entomologist
239-658-3427
UF/IFAS Extension Offices with Citrus Agents
Hardee, Hendry, Highlands, Lake, Polk, St. Lucie, Sumter
Websites
UF/IFAS Extension Citrus Agents
http://citrusagents.ifas.ufl.edu
UF/IFAS Citrus REC
http://www.crec.ifas.ufl.edu
UF/IFAS Southwest Florida REC
http://www.imok.ufl.edu
Local UF/IFAS Extension Office

http://sfyl.ifas.ufl.edu/map/index.shtml

For more information, please contact the UF/IFAS Citrus Research and Education Center, Lake Alfred 863-956-1151

Footnotes

1.

This document is CH201, one of a series of the Horticultural Sciences Department, UF/IFAS Extension. Original publication date August 2008. Revised January 2015. Visit the EDIS website at http://edis.ifas.ufl.edu.

2.

Jamie D. Burrow, coordinator for canker and greening Extension education; Stephen H. Futch, Extension agent IV; and Timothy M. Spann, former associate professor, Horticultural Sciences Department, Citrus Research and Education Center—Lake Alfred, FL, UF/IFAS Extension.


The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.