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Publication #ENY1000

Citrus Pest Quick Guide: Diaprepes Root Weevil1

Lauren M. Diepenbrock and Jamie D. Burrow2

Life Cycle

Eggs are oval with smooth exteriors. They are pale yellow to white and approximately 1.2 mm long and 0.4 mm wide. Eggs are laid in concealed locations, often between two leaves glued together. They hatch in 7–8 days, and larvae drop to the soil, where they feed on roots.

Figure 1. 

Diaprepes eggs.


Credit:

T. R. Weeks, UF/IFAS


[Click thumbnail to enlarge.]

Larva are cream-colored, lack true legs, and grow to approximately 2.5 cm (less than 1 inch). The larvae feed on roots in the soil feeding for several months to complete development before pupating and emerging as adults.

Figure 2. 

Diaprepes larva.


Credit:

L. Buss, UF/IFAS


[Click thumbnail to enlarge.]

Adults range from 1–2 cm (less than 1 inch) in length. They are black with small red, orange, and/or yellow stripes on their wing covers (backs). Adult males live about one month while females live for 3–4 months, laying up to 5,000 eggs per lifetime.

Figure 3. 

Diaprepes adult.


Credit:

L. Buss, UF/IFAS


[Click thumbnail to enlarge.]

Figure 4. 

Diaprepes adults.


Credit:

R. Stewart, UF/IFAS


[Click thumbnail to enlarge.]

Damage

Adult weevils can occasionally severely damage tree foliage by eating large portions of leaves; however, the damage to foliage is generally not economically important. The majority of damage is caused by larval feeding on roots. Larvae can girdle the taproot, preventing the plant from taking in nutrients and water, which eventually leads to the death of the tree. Larval feeding also opens wounds through which Phytophthora fungus may enter roots, leading to root rot.

Figure 5. 

Damaged roots from Diaprepes larva feeding.


Credit:

L. M. Diepenbrock, UF/IFAS


[Click thumbnail to enlarge.]

Figure 6. 

Diaprepes feeding on foliage.


Credit:

R. Stewart


[Click thumbnail to enlarge.]

Footnotes

1.

This document is ENY1000, one of a series of the Entomology and Nematology Department, UF/IFAS Extension. Original publication date December 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, Entomology and Nematology Department; and Jamie D. Burrow, Extension program manager; UF/IFAS Citrus Research and Education Center 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.