Scientists & Staff

Michael E. Ostry

Notes: This person is no longer an employee of the Northern Research Station.

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National Research Highlights

Hybrid aspen leaves showing bronze leaf disease. Mike Ostry, USDA Forest Service

Bronze Leaf Disease Poses a Threat to Aspen Breeding

Year: 2013

Bronze leaf of hybrid aspen is a systemic disease that results in a characteristic dark purple to brown pigmentation of infected aspen leaves in late summer. Branches on affected trees die over a period of several years until entire trees eventually die. Many otherwise promising hybrids and natural hybrids are highly susceptible, which suggests that this disease is an important ecological natural genetic barrier that maintains pure aspen species. Forest Service scientists have studied and characterized the complete life cycle, pathology, and host range of this fungus, which were previously unknown.

Last modified: Saturday, July 2, 2022