How to Manage Pests

Pests in Gardens and Landscapes

Septoria leaf spot—Septoria spp.

Several dozen Septoria fungal species occur in the United States. Each causes round, angular, flecked, sunken, or irregular spots on mostly older leaves on a different group of closely related hosts. Aspen, azalea, cottonwood, hebe, and poplar are commonly infected. Cankers may develop on the branches of certain severely infected Populus species.

Identification

Solutions

Prune out and dispose of infected wood in the fall. Avoid overhead sprinklers, which splash spores onto the plant, or irrigate early in the day so that the foliage dries more quickly.

Characteristic of septoria
These round spots are characteristic of septoria


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

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