UC IPM Online UC ANR home page UC IPM home page


SKIP navigation


How to Manage Pests

UC Pest Management Guidelines


Aspergillus Rot

Pathogen: Aspergillus flavus, Aspergillus parasiticus, and other Aspergillus species

(Reviewed 7/06, updated 1/09)

In this Guideline:


Infection by these Aspergilli fungi causes the internal tissues of the cavity of fresh figs to turn bright yellow (A. ochraceus and A. melleus), bright green (A. flavus), brown green (A. tamarii), or dark green to olive color (A. parasiticus). Eventually the tissues become powdery from the production of masses of spores. Parts of the cavity (usually close to the ostiole – eye of fig) or the entire interior of the figs can be infected and turn into a mass of powder (conidia of Aspergillus fungi).


Similar to smut, which is caused by other Aspergillus spp., Aspergillus rot refers to symptoms seen on fresh figs, whereas smut occurs on dried figs. Most cultivars of figs are affected by Aspergillus fungi, but the Calimyrna and Conadria figs are affected the most. In general, cultivars with small ostioles suffer less disease than those with larger ostioles. Decay usually begins at the eye-end of the figs when they are still green. In later stages, when the fruit is ripe, the fungus produces abundant powdery spore masses. The incidence of this type of rot is very small, for instance 1 in 2,500 figs can be infected by A. flavus or 1 in 10,000 figs can be infected by A. parasiticus. However, figs infected by A. flavus or A. parasiticus usually are contaminated with aflatoxins. Figs that are infected by A. flavus usually show a yellowish green fluorescence under UV light, which can be used to separate contaminated figs from uncontaminated ones.


Avoid creating excess dust or letting the trees become water stressed. Choose cultivars with a small ostiole. No chemical treatments are recommended for this disease. For dried figs, remove figs at the processing plant that show characteristic yellowish green fluorescence.


[UC Peer Reviewed]

UC IPM Pest Management Guidelines: Fig
UC ANR Publication 3447
T. J. Michailides, Plant Pathology, Kearney Agricultural Center, Parlier
L. Ferguson, Pomology, Kearney Agricultural Center, Parlier

Top of page

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2019 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   Contact webmaster.