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Horticulture and Home Pest News
Horticulture & Home Pest News is filled with articles on current horticulture, plant care, pest management, and common household pests written by Iowa State University Extension specialists in the Departments of Entomology, Horticulture and Plant Pathology.

Ash Rust fungus

This article was published originally on 6/18/2004

Samples with ash rust have recently been submitted to the Plant Disease Clinic. The fungus that causes this disease, Puccinia sparganioides, can infect different types of ash trees. Yellow to orange pustules cover the misshapen leaves, petioles, and small twigs of the infected tissues.

This fungus appears more threatening than it is because of the noticeably bright color of the pustules. In Iowa, controls are rarely needed because the fungus typically does little damage to the tree. Cord or marsh grasses are required for the fungus to complete its life cycle, overwinter, and re-infect ash trees.

For images of ash rust visit the Plant Disease Clinic website , select the Plant Diseases option, then Broadleaf Trees, and Ash Rust.



This article originally appeared in the 6/18/2004 issue.

Year of Publication: 
2004
Issue: 
IC-491(14) -- June 18, 2004