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Publication #ENY2041

Citrus Pest Quick Guide: Citrus Leafminer (Phyllocnistis citrella Stainton)1

Lauren M. Diepenbrock and Jamie D. Burrow, 2

Life Cycle

Eggs look like tiny dew drops on young expanding leaf growth. Eggs are usually found beside the midvein on the underside of an unexpanded leaf.

Larvae emerge directly into leaf tissue and begin mining along the midvein in a back and forth pattern until pupation occurs. If populations are high, several larvae can be found in one leaf and even on young stems.

Adults are small moths with a 4 mm wingspan and can resemble a speck of dust. They shelter in the tree canopy during the day and emerge at night to deposit eggs. Females can lay 50 eggs in their short lifespan, causing populations to grow quickly.

Damage

Larval feeding causes distorted leaves with reduced photosynthetic capacity. Full leaf expansion is often not completed. Due to the damage, there is chlorosis on the other side of the leaf. In severe cases, leaf drop and possible stem dieback can occur.

Damage generally starts in spring as temperatures rise and can increase rapidly under ideal conditions. The lowest populations are in the winter months, and the highest populations are in spring and summer. Population levels vary from year to year.

Leafminer damage also becomes an entry point for citrus canker bacteria.

Figure 1. 

Citrus leafminer larva.


Credit:

UF/IFAS


[Click thumbnail to enlarge.]

Figure 2. 

Citrus leafminer pupa.


Credit:

L.M. Diepenbrock, UF/IFAS


[Click thumbnail to enlarge.]

Figure 3. 

Citrus leafminer adult magnified.


Credit:

L. Buss, UF/IFAS


[Click thumbnail to enlarge.]

Figure 4. 

Citrus leafminer adult (right of penny).


Credit:

T. R. Weeks, UF/IFAS


[Click thumbnail to enlarge.]

Figure 5. 

Top and Bottom Left: Citrus leafminer damage. Right: Citrus leafminer damage with canker lesions.


Credit:

J. D. Burrow, UF/IFAS


[Click thumbnail to enlarge.]

Footnotes

1.

This document is ENY2041, one of a series of the Entomology and Nematology Department, UF/IFAS Extension. Original publication date October 2019. Visit the EDIS website at https://edis.ifas.ufl.edu for the currently supported version of this publication.

2.

Lauren M. Diepenbrock, assistant professor, Department of Entomology and Nematology; and Jamie D. Burrow, Extension program manager, UF/IFAS Citrus Research and Education Center; Gainesville, FL 32611.


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.