How to Manage Pests

Pests in Gardens and Landscapes

Anthracnose—Collectotrichum gloeosporioides

Anthracnose may blemish the rind tissue of mature Valencia and navel oranges, grapefruit, and occasionally lemon. The disorder affects mainly fruit on stressed trees with old, dead wood. The Anthracnose fungus usually first infects weakened twigs. During wet or foggy weather, Anthracnose spores drip onto fruit, where they infect the rind and leave dull, reddish green streaks.


This disorder is generally not severe enough to require preventive actions.

Anthracnose infection
Anthracnose infection

Statewide IPM Program, Agriculture and Natural Resources, University of California
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