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Genetics & Resistance Breeding

Research is underway to understand resistance mechanisms in Asian ash species to Emerald Ash Borer and to develop hybrids that incorporate this resistance into North America ash species. These efforts include:

The Northern Research Station also searches for resistance to plant pathogens, such as and Dutch Elm Disease.

The Pacific Southwest Research Station has funded studies seeking resistance in tanoak to the pathogen, Phytophthora ramorum. Find publications on this research on Treesearch.

White pine blister rust, introduced to the U.S. in the early 1900's, has been the focus of resistance breeding efforts at the Rocky Mountain Research Station. At first only the economically important timber species — western white pine, sugar pine, and eastern white pine — were studied. In recent years, an appreciation for the ecological importance of high elevation white pine species has led the Forest Service to identify resistant “plus trees” and protect them where feasible from mountain pine beetle attack. Seeds are being collected to represent the range of geographic variation and tested for resistance. Find more publications on this research on Treesearch.

The Southern Research Station has for many years studied and identified fusiform resistance sources in families of slash and loblolly pine. Find publications on this research on Treesearch.