USDA Forest Service

Pacific Southwest Research Station
Pacific Southwest
Research Station

800 Buchanan Street
Albany, CA 94710-0011
(510) 883-8830
United States Department of Agriculture Forest Service. USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.

Ontogenetic Resistance

Some highly resistant sugar pines in heavily infected stands transmit none of their resistance to seedlings.
Note offspring of unifected tree on the left do not express resistance when challenged by rust as seedlings (below).
Last Modified: Aug 29, 2016 11:00:52 AM