Characterizing the telial host breadth of Cronartium ribicola in western Canada and developing tools to generate genetic markers of virulence and resistance

The project aims to improve conservation outcomes for limber pine and whitebark pine by identifying alternate host plant species for
white pine blister rust (WPBR), determining the genetic and molecular factors underlying WPBR virulence in Cronartium ribicola, and developing genetic markers to track the spread of emerging fungal races.

Populations of limber pine (LP) and whitebark pine (WBP) in Alberta are in severe decline due to white pine blister rust (WPBR), which infects over 90% of monitored stands. WPBR is the leading cause of mortality, threatening both species with regional extirpation within decades. Their loss would destabilize subalpine ecosystems, reduce biodiversity, and diminish key functions like water retention and soil stabilization. These keystone species also support wildlife, recreation, and tourism. This project will identify alternate hosts, examine fungal virulence mechanisms, and develop genetic markers to guide restoration and disease management of these ecologically vital trees.