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Publication #PP328

Huanglongbing (HLB; Citrus Greening) and Nutrient Deficiency Identification1

Tripti Vashisth, Megan M. Dewdney, and Jamie D. Burrow2

Huanglongbing (HLB) is a bacterial disease that is spread by an insect, the Asian citrus psyllid. This fact sheet, which is best viewed as a PDF (, explains how to tell the difference between HLB symptoms and symptoms from nutrient deficiencies.

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This document is PP328, one of a series of the Plant Pathology Department, UF/IFAS Extension. Original publication date June 2016. Revised July 2019. Visit the EDIS website at


Tripti Vashisth, assistant professor, Horticultural Sciences Department; Megan M Dewdney, associate professor, Plant Pathology Department; and Jamie D Burrow, Extension program manager; UF/IFAS Citrus Research and Education Center, Lake Alfred, FL 33850.

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.