Contrasting levels of white pine blister rust infection (needle spots) on secondary needles between one-year old seedlings of two families of western white pine six months after September 2004 artificial inoculation at Dorena GRC in: [1] high spotting seedlings in family 14 vs. [2] very low spotting seedling in Family 22. Family 14 is a known high susceptible family; Family 22 is one of the highest resistant full-sib families tested to date.
Photo by: Richard Sniezko
Date: 2005
Credit: USDA Forest Service, Region 6, Dorena Genetic Resource Center.
Source: DRGC online photo collection:
www.fs.usda.gov/detail/r6/landmanagement/resourcemanageme... Dorena Genetic Resource Center (DGRC) is the USDA Forest Service's regional service center for genetics in the Pacific Northwest Region. Dorena houses disease resistance breeding programs for five-needled pines and Port-Orford-cedar, a native plant development program, and the National Tree Climbing Program. For additional photos of the DGRC program, see:
www.fs.usda.gov/detail/r6/landmanagement/resourcemanageme... Image provided by USDA Forest Service, Region 6, State and Private Forestry, Forest Health Protection:
www.fs.usda.gov/main/r6/forest-grasslandhealth
